list RATE
In word problems, average speed is simply another way of saying “rate.”RATIO a comparison of “parts” to “parts”
Example: In order to make fruit punch, Debra needs 2 parts orange juice to every 5parts pineapple juice. The ratio is , or 0.4.REAL NUMBER any number that is not imaginary
RECIPROCAL the inverse of a number (when you flip the numerator and denominator)
Example: is the reciprocal of .
RECTANGLE Rectangles are special parallelograms; therefore, any fact about parallelograms
also applies to rectangles. Rectangles have the following properties:
- Each of the four angles are equal to 90 degrees.
- area = length × width = lw
- perimeter = 2(length) + 2(width) = 2l + 2w
- The diagonals are equal.
REMAINDER the number left over after dividing
Example: When 10 is divided by 8, the remainder is 2.REVENUE in word problems, a word that means “total money earned”
SCATTERPLOT a set of data represented on a graph by multiple dots, typically forming a
linear pattern