*Exponents *(powers) are repeated multiplication: When you raise a number to the power of an exponent, you multiply that number by itself the number of times indicated by the exponent. For example:

7^{2}= 7 × 7 = 49

2^{5}= 2 × 2 × 2 × 2 × 2 = 32

*Square roots*(radicals) are the inverse of exponent 2 — that is, the number that, when multiplied by itself, gives you the indicated value.

*Absolute value *is the positive value of a number — that is, the value of a negative number when you drop the minus sign. For example:

Absolute value is used to describe numbers that are always positive, such as the distance between two points or the area inside a polygon.