If f(2)= 10, f(3) = 20, f(4) = 30, f(5) = 40, then f(7) =

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30