Math Homework Help??

Question

here is the question:

the formula for the area of a trapezoid is A= 1/2h(b1=b2). Solve this formula for b1.

here are the choices

A: b1= A/2h+ b2

B: b1= A/2h- b2

C: b1= 2A/h+b2

D: b1= 2A/h-b2

if you think im sheating i am not i just want to be able to understand if i did this right since it is my first grade going into 8th grade. if you dont want to give me the answer at least explain it to me. thanks!!

Answer 1

the answer is D. b1=2A/h-b2

you divivde both sides by 1/2, so you get 2A=h(b1+b2)

then you divide both sides by h, and yu get 2A/h=b1+b2

then you subtract b2 by both sides, and you get the answer, which is

           D. b1=2A/h-b2