The formula for the area of a trapezoid is \( A = \frac{1}{2}h(b_1 + b_2) \).
To rearrange this for \( h \):
1. Multiply both sides by \( 2 \) to eliminate the fraction:
\[
2A = h(b_1 + b_2)
\]
2. Now, divide both sides by \( (b_1 + b_2) \):
\[
h = \frac{2A}{b_1 + b_2}
\]
So the correct response that expresses \( h \) in terms of \( A \), \( b_1 \), and \( b_2 \) is:
\[
h = \frac{2A}{b_1 + b_2}
\]