Solve the problem. Use 3.14 for $\pi$. Round your answer to the nearest hundredth.
-Cindy wants to secure sequins on a piece of felt shaped like a trapezoid with a height of $8 \mathrm {~cm}$ and bases of $15 \mathrm {~cm}$ and $9 \mathrm {~cm}$. What is the cost of all the sequins if sequins cost $\$ 0.80 \mathrm { per } \mathrm { cm } ^ { 2 }$ of coverage?
A) $\$ 76.80$
B) $\$ 32.00$
C) $\$ 25.60$
D) $\$ 82.80$

Question

Quizplus · Accepted Answer

The area of a trapezoid is given by the formula $\frac{1}{2}h(b_1 + b_2)$, where $h$ is the height and $b_1$ and $b_2$ are the lengths of the two bases. Substituting the given values, the area is $\frac{1}{2} \times 8 \times (15 + 9) = 4 \times 24 = 96 \mathrm{cm}^2$. At $0.80 per $\mathrm{cm}^2$, the cost is $96 \times 0.80 = \$76.80$.

Solve the Problem π\piπ Round Your Answer to the Nearest Hundredth

Solve the Problem $\pi$ Round Your Answer to the Nearest Hundredth