The answer is Letter D - WB = 17
First, find the dimension of WB by squaring the given equations as h^2 and l^2 for them to have the same value then you can equate them. Transpose and simplify.
(5x - 8)^2 = h^2
(3x + 2)^2 = l^2
5x - 8 = 3x + 2
5x - 3x = 8 + 2
2x = 10
x = 5
Substitute x to either of the equations to solve WB.
WB = 5x - 8
WB = 5(5) - 8
WB = 17
or
WB = 3x + 2
WB = 3(5) + 2
WB = 17
