Need help on this one thank u

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

The liabilities of cullumber are $99,000. owner’s capital is $143,000; drawings are $96,000; revenues, $467,000; and expenses, $301,000. what is the amount of cullumber company’s total assists?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'