Multiply

a) 5pq (p2+ q2+pq)

b) -7pr (pq – qr - rq)

c) (4x-3y) (5x-4a)

What is the exact volume of the cylinder 1.5 m 2.5 m

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2