A=1/2h(B+b)(for b)

multiply both sides by 2/h
Then, subtract B from both sides.

To solve the equation A = (1/2)h(B+b) for b, you can follow these steps:

1. Multiply both sides of the equation by 2/h:
2/h * A = 2/h * (1/2)h(B+b)

This simplifies to:
2A/h = B + b

2. Now, subtract B from both sides of the equation:
2A/h - B = B + b - B

The B term on the right side cancels out, leaving us with:
2A/h - B = b

Therefore, the expression for b is:
b = 2A/h - B

Remember to always perform the same operations on both sides of the equation to maintain equality.