[+]   Radical Expressions[+]   Random Number Generator[+]   Random Sampling from the Normal DistributionFree Random Sampling from the Normal Distribution Calculator - This performs hypothesis testing on a sample mean with critical value on a sample mean or calculates a probability that Z <= z or Z >= z using a random sample from a normal distribution.

Features:  Calculator | Quiz Generator | Practice Problem Generator

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[+]   Random TestFree Random Test Calculator - Given a set of data and an α value, this determines the test statistic and accept/reject hypothesis based on randomness of a dataset.

Features:  Calculator | Quiz Generator

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[+]   Rates of ReturnFree Rates of Return Calculator - Given a set of stock prices and dividends if applicable, this calculates the periodic rate of return and the logarithmic rate of return

Features:  Calculator | Practice Problem Generator

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[+]   Ratio Word ProblemsFree Ratio Word Problems Calculator - Solves a ratio word problem using a given ratio of 2 items in proportion to a whole number.

Features:  Calculator | Practice Problem Generator

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[+]   Rational Exponents - Fractional Indices[+]   Rational Number SubtractionFree Rational Number Subtraction Calculator - Subtracting 2 numbers, this shows an equivalent operations is adding the additive inverse. p - q = p + (-q)

Features:  Calculator | Practice Problem Generator

Examples (1):
15-5

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[+]   Rational NumbersFree Rational Numbers Calculator - This lesson walks you through what rational numbers are, how to write rational numbers, rational number notation, and what's included in rational numbers

Features:  Calculator | Practice Problem Generator | Watch the Video

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[+]   Rational Numbers Between[+]   Rational,Irrational,Natural,Integer PropertyFree Rational,Irrational,Natural,Integer Property Calculator - This calculator takes a number, decimal, or square root, and checks to see if it has any of the following properties:
* Integer Numbers
* Natural Numbers
* Rational Numbers
* Irrational Numbers Handles questions like: Irrational or rational numbers Rational or irrational numbers rational and irrational numbers Rational number test Irrational number test Integer Test Natural Number Test

Features:  Calculator | Practice Problem Generator | Watch the Video

Examples (4):
is 34 natural
is 85.6 rational
prove 99.7 is rational
is 45 an integer

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[+]   Ratios[+]   Real Numbers[+]   Rebound Ratio[+]   Receivables RatiosFree Receivables Ratios Calculator - Given Net Sales, Beginning Accounts Receivable, and Ending Accounts Receivable, this determines Average Accounts Receivable, Receivables turnover ratio, and Average Collection Period.

Features:  Calculator | Practice Problem Generator

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[+]   Rectangle Word Problem[+]   Rectangles and Parallelograms[+]   Rectangular Number[+]   Rectangular Solid[+]   Reference Angle[+]   Reflexive Property[+]   Regrouping[+]   Relative CoordinatesFree Relative Coordinates Calculator - Given a starting point (x1,y1), this will determine your relative coordinates after moving up, down, left, and right.

Features:  Calculator | Quiz Generator | Practice Problem Generator | Watch the Video

Examples (2):
Starting at a point of (1,5), you move 2 spaces up, 3 spaces left
Starting at a point of (1,5), you move 2 spaces up, 8 spaces right, 7 spaces down, 3 spaces left

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[+]   Relative Error[+]   Repeating Decimal[+]   Resistor Color Codes[+]   RGB and HEX conversions[+]   RhombusFree Rhombus Calculator - Given inputs of a rhombus, this calculates the following:
Perimeter of a Rhombus
Area of a Rhombus
Side of a Rhombus

Features:  Calculator | Watch the Video

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[+]   Right TrianglesFree Right Triangles Calculator - This solves for all the pieces of a right triangle based on given inputs using items like the sin ratio, cosine ratio, tangent ratio, and the Pythagorean Theorem as well as the inradius.

Features:  Calculator

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[+]   Roman Numeral Conversions[+]   Roster Notation[+]   ROT-13 Conversions[+]   Roulette[+]   Roulette Cumulative BettingFree Roulette Cumulative Betting Calculator - This calculator displays the probability and return grid for a roulette scenario where you play x games, betting y per number playing z numbers per game.

Features:  Calculator | Practice Problem Generator

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[+]   Rounding[+]   Rounding to Decimal Places[+]   Rule of 72[+]   Rule of Succession[+]   Run Length Encoding

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