Reflect - to repeat an image by flipping it across a line so it appears as it would in a mirror. Reduce - to rewrite a fraction in lowest terms. Recursion - given some starting information and a rule for how to use it to get new information, the rule is then repeated using the new information. Rectangular Solid - a volume bounded by rectangle faces. Rectangular Coordinate System - a plane made up of an x axis (the horizontal line) and a y axis (the vertical line). Rectangle - a parallelogram with four right angles and four sides. Reciprocal of a Number - the number need to multiply to get 1 as the answer. Real Variable - a variable whose value ranges over the real numbers. Real Part - the real number x is called the real part of the complex number x+iy where x and y are real and i=sqrt(-1). Real Numbers - consist of both the rational and irrational numbers. Real Axis - the x-axis of an Argand diagram. Rational Number - a number that can be written as a fraction with integers as the numerator and denominator. Ratio - a rational number of the form a/b where a is called the numerator and b is called the denominator, a comparison of numbers, the quotient or result of one quantity divided by another (fraction). Rate - a certain percent of the principal which indicates the interest on one dollar for one year the number denoting how many hundredths of the base are to be taken. Range of the Function F - the set of all the numbers f(x) for x in the domain of f. Note that the range is a single number, not many numbers. Range - the range of a set of numbers is the largest value in the set minus the smallest value in the set. Random Number Generators - a device used to produce a selection of numbers in a fair manner, in no particular order and with no favor being given to any numbers. Ray - a straight line that begins at a point and continues outward in one direction. Rationalize the Denominator - a process that gets rid of the radical in the denominator.
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