Does anyone know the answer to this question?

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

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap