20 + x
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If x stays the same the expression stays the same. Since the expression involves negative x, the value of the expression decreases as x increases.
20 cubed = 20 x 20 x 20 = 8000
20/x = 9 Divide each side by 20. you get 1/x = 9/20. flip both sides. you get x = 20/9
(20 + x)-3
A 20 x 20 room will have a perimeter of 20 + 20 + 20 + 20 = 80.