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Up to 100 numerically distinct questions per formula — every variant is checked for uniqueness before it's added to your pack.

SUVAT — final velocityPhysics

unique variants:easy 1498med 1500hard 1500· max pack 100·default

SUVAT — displacementPhysics

unique variants:easy 1483med 1500hard 1500· max pack 100·default

SUVAT — v² = u² + 2asPhysics

unique variants:easy 1453med 1500hard 1500· max pack 100·default

SUVAT — s = ½(u+v)tPhysics

unique variants:easy 1492med 1500hard 1500· max pack 100·default

Newton's Second LawPhysics

unique variants:easy 1197med 1499hard 1500· max pack 100·default

WeightPhysics

unique variants:easy 146med 1067hard 1244· max pack 100·default

Work donePhysics

unique variants:easy 1415med 1500hard 1500· max pack 100·default

Kinetic EnergyPhysics

unique variants:easy 1022med 1500hard 1500· max pack 100·default

Gravitational PE (near Earth)Physics

unique variants:easy 950med 1500hard 1500· max pack 100·default

PowerPhysics

unique variants:easy 1143med 1500hard 1500· max pack 100·default

EfficiencyPhysics

unique variants:easy 1168med 1499hard 1500· max pack 100·default

Linear MomentumPhysics

unique variants:easy 1219med 1499hard 1500· max pack 100·default

ImpulsePhysics

unique variants:easy 1495med 1500hard 1500· max pack 100·default

Hooke's LawPhysics

unique variants:easy 1036med 1500hard 1500· max pack 100·default

Elastic Potential EnergyPhysics

unique variants:easy 1216med 1500hard 1500· max pack 100·default

DensityPhysics

unique variants:easy 1008med 1498hard 1500· max pack 100·default

Pressure (force per area)Physics

unique variants:easy 1074med 1499hard 1500· max pack 100·default

Hydrostatic PressurePhysics

unique variants:easy 1097med 1499hard 1500· max pack 100·default

Moment of a ForcePhysics

unique variants:easy 933med 1500hard 1500· max pack 100·default

Centripetal AccelerationPhysics

unique variants:easy 1279med 1500hard 1499· max pack 100·default

Centripetal ForcePhysics

unique variants:easy 1496med 1500hard 1500· max pack 100·default

Newton's Law of GravitationPhysics

unique variants:easy 1491med 1500hard 1500· max pack 100·default

Gravitational field strengthPhysics

unique variants:easy 1211med 1500hard 1500· max pack 100·default

Orbital SpeedPhysics

unique variants:easy 1202med 1500hard 1500· max pack 100·default

Kepler's Third LawPhysics

unique variants:easy 1181med 1500hard 1500· max pack 100·default

Wave equationPhysics

unique variants:easy 1251med 1499hard 1500· max pack 100·default

Period & FrequencyPhysics

unique variants:easy 837med 913hard 1118· max pack 100·wide-easy

Angular frequencyPhysics

unique variants:easy 837med 851hard 1078· max pack 100·wide-easy

SHM displacementPhysics

unique variants:easy 1493med 1500hard 1500· max pack 100·default

Period of a pendulumPhysics

unique variants:easy 130med 1099hard 1259· max pack 100·default

Mass-spring periodPhysics

unique variants:easy 1050med 1500hard 1500· max pack 100·default

Snell's LawPhysics

unique variants:easy 1488med 1500hard 1499· max pack 100·default

Double-slit fringe spacingPhysics

unique variants:easy 1483med 1500hard 1500· max pack 100·default

Ohm's LawPhysics

unique variants:easy 1234med 1499hard 1500· max pack 100·default

ChargePhysics

unique variants:easy 1240med 1500hard 1500· max pack 100·default

Electrical PowerPhysics

unique variants:easy 1165med 1500hard 1500· max pack 100·default

ResistivityPhysics

unique variants:easy 1492med 1500hard 1500· max pack 100·default

EMF & Internal ResistancePhysics

unique variants:easy 1491med 1500hard 1500· max pack 100·default

CapacitancePhysics

unique variants:easy 1016med 1500hard 1500· max pack 100·default

Energy in a capacitorPhysics

unique variants:easy 1025med 1500hard 1500· max pack 100·default

Coulomb's LawPhysics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

E-field in parallel platesPhysics

unique variants:easy 1085med 1500hard 1500· max pack 100·default

Force on a current-carrying wirePhysics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Force on a moving chargePhysics

unique variants:easy 1489med 1500hard 1500· max pack 100·default

Faraday's LawPhysics

unique variants:easy 1483med 1500hard 1500· max pack 100·default

Transformer equationPhysics

unique variants:easy 1494med 1500hard 1500· max pack 100·default

Specific Heat CapacityPhysics

unique variants:easy 1491med 1500hard 1500· max pack 100·default

Specific Latent HeatPhysics

unique variants:easy 958med 1500hard 1500· max pack 100·default

Ideal Gas EquationPhysics

unique variants:easy 1483med 1500hard 1500· max pack 100·default

Radioactive decayPhysics

unique variants:easy 1488med 1500hard 1500· max pack 100·default

Half-lifePhysics

unique variants:easy 837med 850hard 1080· max pack 100·wide-easy

Mass–EnergyPhysics

unique variants:easy 911med 879hard 1100· max pack 100·wide-easy

Photon energyPhysics

unique variants:easy 837med 854hard 1078· max pack 100·wide-easy

Photoelectric equationPhysics

unique variants:easy 907med 1500hard 1500· max pack 100·default

de Broglie wavelengthPhysics

unique variants:easy 869med 913hard 1118· max pack 100·wide-easy

Hubble's LawPhysics

unique variants:easy 1046med 1498hard 1500· max pack 100·default

Stefan–Boltzmann LawPhysics

unique variants:easy 1208med 1499hard 1500· max pack 100·default

Wien's Displacement LawPhysics

unique variants:easy 869med 798hard 1076· max pack 100·wide-easy

Quadratic FormulaMathematics

DiscriminantMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Completing the squareMathematics

Logarithm product lawMathematics

unique variants:easy 1479med 1498hard 1499· max pack 100·default

Exponential growth/decayMathematics

unique variants:easy 1491med 1500hard 1500· max pack 100·default

Arithmetic sequence — nth termMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Arithmetic series — sum of n termsMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Geometric sequence — nth termMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Geometric series — sum of n termsMathematics

unique variants:easy 1479med 1498hard 1499· max pack 100·default

Geometric series — sum to infinityMathematics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Pythagoras' TheoremMathematics

Sine RuleMathematics

unique variants:easy 1494med 1500hard 1500· max pack 100·default

Cosine RuleMathematics

unique variants:easy 1489med 1500hard 1500· max pack 100·default

Area of triangle (sine)Mathematics

unique variants:easy 1489med 1500hard 1500· max pack 100·default

Arc length (radians)Mathematics

unique variants:easy 1189med 1500hard 1500· max pack 100·default

Sector area (radians)Mathematics

unique variants:easy 1189med 1500hard 1500· max pack 100·default

Distance between two pointsMathematics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Midpoint of a segmentMathematics

Gradient of a lineMathematics

Circle equationMathematics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Vector magnitude (3D)Mathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Power rule (derivative)Mathematics

Power rule (integral)Mathematics

Percentage changeMathematics

Simple interestMathematics

Compound interestMathematics

Arithmetic meanMathematics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Variance (population)Mathematics

Binomial probabilityMathematics

unique variants:easy 1483med 1500hard 1483· max pack 100·default

Poisson probabilityMathematics

Conditional probabilityMathematics

Standardising (z-score)Mathematics

unique variants:easy 1479med 1499hard 1500· max pack 100·default

Modulus of a complex numberFurther Mathematics

unique variants:easy 1009med 1497hard 1500· max pack 100·default

Argument of a complex numberFurther Mathematics

unique variants:easy 1009med 1497hard 1500· max pack 100·default

De Moivre's TheoremFurther Mathematics

unique variants:easy 1046med 1456hard 1198· max pack 100·default

Modulus of a productFurther Mathematics

2×2 DeterminantFurther Mathematics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

2×2 Matrix inverseFurther Mathematics

3×3 Determinant (cofactor expansion)Further Mathematics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Polar → Cartesian (x-coordinate)Further Mathematics

Polar → Cartesian (y-coordinate)Further Mathematics

Hyperbolic sineFurther Mathematics

unique variants:easy 869med 893hard 1077· max pack 100·wide-easy

Hyperbolic cosineFurther Mathematics

Hyperbolic identityFurther Mathematics

Sum of first n integersFurther Mathematics

Sum of first n squaresFurther Mathematics

Moles from massChemistry

unique variants:easy 907med 1500hard 1500· max pack 100·default

ConcentrationChemistry

unique variants:easy 1016med 1499hard 1499· max pack 100·default

Ideal Gas EquationChemistry

unique variants:easy 1483med 1500hard 1500· max pack 100·default

Percentage yieldChemistry

unique variants:easy 907med 1500hard 1500· max pack 100·default

Atom economyChemistry

unique variants:easy 1009med 1497hard 1500· max pack 100·default

pHChemistry

unique variants:easy 121med 868hard 1095· max pack 100·ph-grid

Ionic product of waterChemistry

unique variants:easy 861med 1500hard 1499· max pack 100·default

Acid dissociation constantChemistry

unique variants:easy 1472med 1500hard 1500· max pack 100·default

pKaChemistry

unique variants:easy 121med 817hard 1057· max pack 100·pka-grid

Henderson–HasselbalchChemistry

unique variants:easy 1480med 1500hard 1500· max pack 100·default

Heat transferred (calorimetry)Chemistry

unique variants:easy 1481med 1500hard 1500· max pack 100·default

Arrhenius equationChemistry

unique variants:easy 1480med 1500hard 1500· max pack 100·default

Gibbs Free EnergyChemistry

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Microscope magnificationBiology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Cardiac outputBiology

unique variants:easy 940med 1500hard 1500· max pack 100·default

Hardy–Weinberg (alleles)Biology

unique variants:easy 704med 692hard 656· max pack 100·wide-easy

Hardy–Weinberg (genotypes)Biology

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Simpson's Diversity IndexBiology

unique variants:easy 1009med 1497hard 1500· max pack 100·default

Chi-squared statisticBiology

unique variants:easy 1009med 1497hard 1500· max pack 100·default

SA:Vol of a sphereBiology

unique variants:easy 798med 863hard 1094· max pack 100·wide-easy

Price Elasticity of DemandEconomics

unique variants:easy 1101med 1499hard 1500· max pack 100·default

Income Elasticity of DemandEconomics

unique variants:easy 958med 1500hard 1500· max pack 100·default

Cross Elasticity of DemandEconomics

unique variants:easy 1009med 1497hard 1500· max pack 100·default

Price Elasticity of SupplyEconomics

unique variants:easy 1101med 1498hard 1499· max pack 100·default

GDP (expenditure approach)Economics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Keynesian MultiplierEconomics

unique variants:easy 704med 828hard 1061· max pack 100·wide-easy

Inflation rate (from CPI)Economics

unique variants:easy 1009med 1497hard 1500· max pack 100·default

Break-even outputBusiness & Accounting

unique variants:easy 1491med 1500hard 1500· max pack 100·default

Contribution per unitBusiness & Accounting

unique variants:easy 1275med 1055hard 1243· max pack 100·default

Margin of safetyBusiness & Accounting

unique variants:easy 1173med 1500hard 1498· max pack 100·default

Return on Capital EmployedBusiness & Accounting

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Current RatioBusiness & Accounting

unique variants:easy 1275med 1500hard 1500· max pack 100·default

Acid-test ratioBusiness & Accounting

unique variants:easy 1495med 1500hard 1500· max pack 100·default

GearingBusiness & Accounting

unique variants:easy 1173med 1500hard 1498· max pack 100·default

Average Rate of ReturnBusiness & Accounting

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Straight-line depreciationBusiness & Accounting

unique variants:easy 1489med 1500hard 1500· max pack 100·default

Stream dischargeGeography

unique variants:easy 1162med 1499hard 1500· max pack 100·default

Hydraulic radiusGeography

unique variants:easy 1046med 1496hard 1500· max pack 100·default

Population densityGeography

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Spearman's rank (for ties-free data)Geography

unique variants:easy 1009med 1495hard 1499· max pack 100·default

Binary → Decimal (8-bit)Computer Science

File transfer timeComputer Science

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Bitmap image file sizeComputer Science

unique variants:easy 1489med 1500hard 1500· max pack 100·default

Sound file sizeComputer Science

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Standard deviation (sample)Psychology

unique variants:easy 1009med 1028hard 956· max pack 100·default

Chi-squared (one term)Psychology

unique variants:easy 1009med 1497hard 1500· max pack 100·default

Distance between two pointsMathematics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Midpoint x-coordinateMathematics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Gradient between two pointsMathematics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Arc length (radians)Mathematics

unique variants:easy 1189med 1500hard 1500· max pack 100·default

Geometric series sumMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Binomial coefficientMathematics

unique variants:easy 810med 1305hard 1128· max pack 100·default

Z-scoreFurther Mathematics

unique variants:easy 1479med 1499hard 1500· max pack 100·default

Standard error of the meanFurther Mathematics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Binomial probabilityFurther Mathematics

unique variants:easy 1483med 1496hard 1499· max pack 100·default

Real GDPEconomics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Marginal propensity to consumeEconomics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Sample meanPsychology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Chi-square componentPsychology

unique variants:easy 1275med 1055hard 1243· max pack 100·default

Spearman's rank correlationPsychology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Population densityGeography

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Natural increase rateGeography

unique variants:easy 1479med 1499hard 1500· max pack 100·default

Gross profit marginBusiness & Accounting

unique variants:easy 1162med 1500hard 1500· max pack 100·default

Dilution equationChemistry

unique variants:easy 1477med 1500hard 1500· max pack 100·default

pH + pOHChemistry

unique variants:easy 121med 808hard 1073· max pack 100·ph-grid

Body mass indexBiology

unique variants:easy 1004med 1500hard 1500· max pack 100·default

WeightPhysics

unique variants:easy 958med 1500hard 1500· max pack 100·default

DensityPhysics

unique variants:easy 890med 1500hard 1499· max pack 100·default

PressurePhysics

unique variants:easy 1173med 1500hard 1500· max pack 100·default

Hydrostatic pressurePhysics

unique variants:easy 1046med 1498hard 1500· max pack 100·default

v² = u² + 2asPhysics

unique variants:easy 1491med 1500hard 1500· max pack 100·default

s = ut + ½at²Physics

unique variants:easy 1494med 1500hard 1500· max pack 100·default

s = ½(u+v)tPhysics

unique variants:easy 1493med 1500hard 1500· max pack 100·default

MomentumPhysics

unique variants:easy 1101med 1500hard 1500· max pack 100·default

Impulse-momentumPhysics

unique variants:easy 1099med 1500hard 1500· max pack 100·default

Kinetic energyPhysics

unique variants:easy 1101med 1499hard 1500· max pack 100·default

Gravitational PE (near surface)Physics

unique variants:easy 1483med 1500hard 1500· max pack 100·default

PowerPhysics

unique variants:easy 1050med 1500hard 1500· max pack 100·default

Work donePhysics

unique variants:easy 1193med 1498hard 1500· max pack 100·default

EfficiencyPhysics

unique variants:easy 907med 1500hard 1500· max pack 100·default

SHM angular frequencyPhysics

unique variants:easy 837med 851hard 1078· max pack 100·wide-easy

SHM period (mass-spring)Physics

unique variants:easy 958med 1500hard 1500· max pack 100·default

SHM period (pendulum)Physics

unique variants:easy 1083med 1500hard 1500· max pack 100·default

Wave speedPhysics

unique variants:easy 1193med 1498hard 1500· max pack 100·default

Snell's lawPhysics

unique variants:easy 1494med 1500hard 1500· max pack 100·default

Thin lens equationPhysics

unique variants:easy 1097med 1498hard 1500· max pack 100·default

Doppler shift (sound, source moving)Physics

unique variants:easy 1495med 1500hard 1500· max pack 100·default

Diffraction gratingPhysics

unique variants:easy 1487med 1500hard 1500· max pack 100·default

Centripetal accelerationPhysics

unique variants:easy 1193med 1499hard 1500· max pack 100·default

Centripetal forcePhysics

unique variants:easy 1488med 1500hard 1500· max pack 100·default

Newton's law of gravitationPhysics

unique variants:easy 1498med 1500hard 1500· max pack 100·default

Escape velocityPhysics

unique variants:easy 1484med 1500hard 1500· max pack 100·default

Kepler's third lawPhysics

unique variants:easy 1488med 1500hard 1500· max pack 100·default

Photon energyPhysics

unique variants:easy 1162med 1499hard 1500· max pack 100·default

Photon energy (wavelength)Physics

unique variants:easy 1477med 1500hard 1500· max pack 100·default

Photoelectric equationPhysics

unique variants:easy 1487med 1500hard 1500· max pack 100·default

de Broglie wavelengthPhysics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Mass-energy equivalencePhysics

unique variants:easy 958med 1500hard 1500· max pack 100·default

Radioactive decayPhysics

unique variants:easy 1488med 1500hard 1500· max pack 100·default

Half-life and decay constantPhysics

unique variants:easy 837med 850hard 1080· max pack 100·wide-easy

ChargePhysics

unique variants:easy 1240med 1500hard 1500· max pack 100·default

Ohm's lawPhysics

unique variants:easy 1193med 1498hard 1500· max pack 100·default

Electrical powerPhysics

unique variants:easy 1165med 1500hard 1500· max pack 100·default

Electrical power (I²R)Physics

unique variants:easy 1193med 1499hard 1500· max pack 100·default

ResistivityPhysics

unique variants:easy 1492med 1500hard 1500· max pack 100·default

Coulomb's lawPhysics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Capacitor energyPhysics

unique variants:easy 1025med 1500hard 1500· max pack 100·default

Capacitor chargePhysics

unique variants:easy 1025med 1499hard 1500· max pack 100·default

Transformer ratioPhysics

unique variants:easy 1484med 1500hard 1500· max pack 100·default

Force on current carrierPhysics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Specific heat capacityPhysics

unique variants:easy 1481med 1500hard 1500· max pack 100·default

Latent heatPhysics

unique variants:easy 958med 1500hard 1500· max pack 100·default

Ideal gas (pV=nRT)Physics

unique variants:easy 1499med 1500hard 1500· max pack 100·default

Stefan-Boltzmann lawPhysics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Wien's displacement lawPhysics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Hubble's lawPhysics

unique variants:easy 1046med 1498hard 1500· max pack 100·default

Sine ruleMathematics

unique variants:easy 1494med 1500hard 1500· max pack 100·default

Cosine ruleMathematics

unique variants:easy 1489med 1500hard 1500· max pack 100·default

Triangle areaMathematics

unique variants:easy 1489med 1500hard 1500· max pack 100·default

Arc lengthMathematics

unique variants:easy 1189med 1500hard 1500· max pack 100·default

Sector areaMathematics

unique variants:easy 1189med 1500hard 1500· max pack 100·default

AP nth termMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Arithmetic series sumMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

GP nth termMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

GP sum (finite)Mathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

GP sum to infinityMathematics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Combinations nCrMathematics

unique variants:easy 810med 849hard 834· max pack 100·default

Permutations nPrMathematics

unique variants:easy 1009med 1497hard 1500· max pack 100·default

Circle equationMathematics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Trapezium ruleMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Newton-Raphson stepMathematics

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Binomial coefficientMathematics

unique variants:easy 1009med 1497hard 1500· max pack 100·default

Volume of cylinderMathematics

unique variants:easy 1097med 1499hard 1500· max pack 100·default

Volume of sphereMathematics

unique variants:easy 798med 839hard 1064· max pack 100·wide-easy

Surface area of sphereMathematics

unique variants:easy 798med 837hard 1079· max pack 100·wide-easy

Volume of coneMathematics

unique variants:easy 1097med 1500hard 1500· max pack 100·default

PythagorasMathematics

unique variants:easy 1009med 1500hard 1499· max pack 100·default

Z-score (standard score)Mathematics

unique variants:easy 1479med 1499hard 1500· max pack 100·default

Complex modulusFurther Mathematics

unique variants:easy 1009med 1500hard 1499· max pack 100·default

Complex argumentFurther Mathematics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

de Moivre's theoremFurther Mathematics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Sum of first n integersFurther Mathematics

unique variants:easy 869med 832hard 1057· max pack 100·wide-easy

Sum of squaresFurther Mathematics

unique variants:easy 869med 893hard 1077· max pack 100·wide-easy

Sum of cubesFurther Mathematics

unique variants:easy 869med 893hard 1077· max pack 100·wide-easy

2×2 determinantFurther Mathematics

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Hyperbolic identityFurther Mathematics

unique variants:easy 1009med 1089hard 1260· max pack 100·default

Polar areaFurther Mathematics

unique variants:easy 1150med 1500hard 1500· max pack 100·default

Moles from massChemistry

unique variants:easy 907med 1500hard 1500· max pack 100·default

Moles from solutionChemistry

unique variants:easy 861med 1500hard 1499· max pack 100·default

Percentage yieldChemistry

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Atom economyChemistry

unique variants:easy 907med 1500hard 1500· max pack 100·default

Ideal gas (chem)Chemistry

unique variants:easy 1499med 1500hard 1500· max pack 100·default

CalorimetryChemistry

unique variants:easy 1481med 1500hard 1500· max pack 100·default

Gibbs free energyChemistry

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Arrhenius equationChemistry

unique variants:easy 1500med 1500hard 1500· max pack 100·default

pH from hydrogen-ion concentrationChemistry

unique variants:easy 121med 868hard 1095· max pack 100·ph-grid

pOH from hydroxide-ion concentrationChemistry

unique variants:easy 121med 868hard 1095· max pack 100·ph-grid

Acid dissociation KaChemistry

unique variants:easy 861med 1500hard 1500· max pack 100·default

Henderson-HasselbalchChemistry

unique variants:easy 1480med 1500hard 1500· max pack 100·default

Beer-Lambert lawChemistry

unique variants:easy 1476med 1500hard 1500· max pack 100·default

Faraday's law (electrolysis)Chemistry

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Ionic product of waterChemistry

unique variants:easy 861med 1500hard 1499· max pack 100·default

MagnificationBiology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Surface area : volume (cube)Biology

unique variants:easy 798med 832hard 1057· max pack 100·wide-easy

Hardy-Weinberg q²Biology

unique variants:easy 869med 900hard 1105· max pack 100·wide-easy

Hardy-Weinberg p+q=1Biology

unique variants:easy 869med 913hard 1118· max pack 100·wide-easy

Lincoln index (mark-recapture)Biology

unique variants:easy 1479med 1500hard 1500· max pack 100·default

Simpson's diversity indexBiology

unique variants:easy 869med 913hard 1118· max pack 100·wide-easy

Cardiac outputBiology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Body Mass Index (BMI)Biology

unique variants:easy 1004med 1500hard 1500· max pack 100·default

Water potentialBiology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Osmotic pressureBiology

unique variants:easy 1500med 1500hard 1500· max pack 100·default

Michaelis-MentenBiology

unique variants:easy 1480med 1500hard 1500· max pack 100·default

Standard errorBiology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Income elasticity (YED)Economics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Cross elasticity (XED)Economics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Price elasticity of supplyEconomics

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Total revenueEconomics

unique variants:easy 1108med 1500hard 1500· max pack 100·default

Inflation rateEconomics

unique variants:easy 1009med 1089hard 1260· max pack 100·default

Unemployment rateEconomics

unique variants:easy 1162med 1500hard 1500· max pack 100·default

Marginal propensity to saveEconomics

unique variants:easy 869med 913hard 1118· max pack 100·wide-easy

Real interest rate (Fisher)Economics

unique variants:easy 1009med 1089hard 1260· max pack 100·default

Money multiplierEconomics

unique variants:easy 869med 852hard 1065· max pack 100·wide-easy

Quantity theory of moneyEconomics

unique variants:easy 1492med 1500hard 1500· max pack 100·default

Gross profit marginBusiness & Accounting

unique variants:easy 1162med 1500hard 1500· max pack 100·default

Net profit marginBusiness & Accounting

unique variants:easy 1162med 1500hard 1500· max pack 100·default

ROCEBusiness & Accounting

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Current ratioBusiness & Accounting

unique variants:easy 1275med 1500hard 1500· max pack 100·default

Acid test ratioBusiness & Accounting

unique variants:easy 1495med 1500hard 1500· max pack 100·default

Break-even unitsBusiness & Accounting

unique variants:easy 1491med 1500hard 1500· max pack 100·default

Contribution per unitBusiness & Accounting

unique variants:easy 1275med 1055hard 1243· max pack 100·default

Margin of safety (%)Business & Accounting

unique variants:easy 1162med 1500hard 1500· max pack 100·default

Payback period (even cashflow)Business & Accounting

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Average Rate of ReturnBusiness & Accounting

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Labour turnoverBusiness & Accounting

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Capacity utilisationBusiness & Accounting

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Market shareBusiness & Accounting

unique variants:easy 1173med 1500hard 1500· max pack 100·default

Straight-line depreciationBusiness & Accounting

unique variants:easy 1489med 1500hard 1500· max pack 100·default

Gearing ratioBusiness & Accounting

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Two's complement rangeComputer Science

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Bitmap image file sizeComputer Science

unique variants:easy 1489med 1500hard 1500· max pack 100·default

Uncompressed audio sizeComputer Science

unique variants:easy 1499med 1500hard 1500· max pack 100·default

Network throughputComputer Science

unique variants:easy 1107med 1500hard 1500· max pack 100·default

Usable hosts in subnetComputer Science

unique variants:easy 869med 832hard 1057· max pack 100·wide-easy

Key space sizeComputer Science

unique variants:easy 869med 813hard 1056· max pack 100·wide-easy

Hash table load factorComputer Science

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Crude birth rateGeography

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Crude death rateGeography

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Natural increase rateGeography

unique variants:easy 1009med 1089hard 1260· max pack 100·default

Doubling time (rule of 70)Geography

unique variants:easy 869med 887hard 1121· max pack 100·wide-easy

Dependency ratioGeography

unique variants:easy 950med 1500hard 1500· max pack 100·default

Nearest neighbour indexGeography

unique variants:easy 1487med 1500hard 1500· max pack 100·default

Bifurcation ratioGeography

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Dry adiabatic lapse rateGeography

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Arithmetic meanPsychology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Range (descriptive statistic)Psychology

unique variants:easy 1009med 1089hard 1260· max pack 100·default

Z-score (psy)Psychology

unique variants:easy 1479med 1499hard 1500· max pack 100·default

IQ (ratio)Psychology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

IQ (deviation)Psychology

unique variants:easy 869med 850hard 1087· max pack 100·wide-easy

Standard error (psy)Psychology

unique variants:easy 1009med 1500hard 1500· max pack 100·default

Spearman-Brown reliabilityPsychology

unique variants:easy 869med 852hard 1095· max pack 100·wide-easy

Forgetting curvePsychology

unique variants:easy 1179med 1499hard 1500· max pack 100·default

Every question is numerically verified. Every solution is shown.