## Algebra: A Combined Approach (4th Edition)

Substitute the values for A, B, and b into the equation: A = $\frac{1}{2}$h(B + b) 180 = $\frac{1}{2}$h(11 + 7) Solve for h by first multiplying both sides by 2: 360 = h(18) Divide both sides by 18: 20 = h