Please help. What is value of x?

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X=

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

Use the elimination method to solve the systems of equations. choose the correct ordered pair. 7x+4y=39

Determine the common ratio and find the next three terms of the geometric sequence. 10, 2, 0.4, a. 0.2; -0.4, -2, -10 c. 0.02; 0.08, 0.016, 0.0032 b. 0.02; -0.4, -2, -10 d. 0.2; 0.08, 0.016, 0.0032 select the best answer from the choices provided a b c d