This was one of my previous test questions:)
A = 1/2(b1+b2)h
To solve for b2, you need to move everything else onto the other side. I'll first multiply through by 2 in order to remove the fraction.
(2)A= 1/2(b1+b2)h (2)
2A= (b1+b2)h
To get rid of the h, divide both sides by h.
2A/h= (b1+b2)h/h
2A/h= b1+b2
To get rid of b1, subtract it from both sides.
2A/h - b1= b1+b2-b1
Answer: 2A/h - b1= b2
I really hope this helps!
