How do you solve this for h?

A=1/2(b1 plus b2)?

This is for a trapezoid, so fine the top length and the bottom length for (b1plus b2) then divide in half for the Area or A

you forgot the h in the original equation, should have been

A = (1/2)(b1 + b2)(h)
then
2A = h(b1+b2)
h = 2A/(b1 + b2)

To solve for "h" in the equation A = 1/2(b1 + b2), we can follow these steps:

Step 1: Start with the given equation A = 1/2(b1 + b2).

Step 2: Multiply both sides of the equation by 2 to eliminate the fraction: 2A = b1 + b2.

Step 3: Subtract b2 from both sides to isolate b1: 2A - b2 = b1.

Step 4: Rearrange the equation to have "h" on one side: b1 = 2A - b2.

Therefore, the equation to solve for "h" is h = 2A - b2.