Two parallel lines are crossed by a transversal. what is the value of a? a = 43 a = 63 a = 117 a = 137

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Twelve less than a number is at most 20

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?