Sam created a porch that was part wooden and part concrete, as shown in the figure below. note: figure not drawn to scale if a = 21 ft, b = 28 ft, and c = 35 ft, what is the total area of the porch? assume that the wooden part is a right triangle and the concrete part is a square. a. 1,519 ft2 b. 1,715 ft2 c. 217 ft2 d. 119 ft2

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.