Idon't understand how to do this problem 8/8+1/2

Acylinder has volume 45π and radius 3. what is it’s height?

Based on the figures as marked, /\rqs = —

Write an equation of the line that passes through the point (2, 3) and is perpendicular to the line x = -1. a) y = 1 b) y = 3 c) y = 0 eliminate d) y = -3