In the central city grand prix, out of 30 cars that started the race, 12 of them finished. what percent of the cars finished the race? what percent did not finish the race?

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

Can some one me with these questions