The monomial 36x4 is a perfect square. what is the square root of 36x4?

a. 6x2
b. 6x4
c.18x2
d. 18x4

Can someone me with my hwplz(only the circled ones)

At the beginning of the day, stock xyz opened at $6.12. at the end of the day, it closed at $6.88. what is the rate of change of stock xyz? a. 1.17% b. 11.0% c. 12.4% d. 81.5%

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?