+0

# 3GTG 2

0
53
1
+136

Suzette and Michael plan to refinish all five surfaces (four sides and the bottom) of their swimming pool as shown. The surfacing materials cost \$20 per square yard. When the total area needing resurfacing is rounded up to the nearest square yard, how many dollars will the surfacing materials for this project cost?

Dec 9, 2018

#1
+3576
+1

$$\text{The front surface is }15\times 4 = 60 ~ft^2\\ \text{The back surface is }15\times 10 = 150 ~ft^2\\ \text{The two sides are a }10\times 25~ft^2 \text{ rectangle minus a }\\ 6 \times 25 ~ft \text{ right triangle}\\ \text{Each side is thus }250 - 75 = 175~ft^2\\ \text{summing these we get }60+150+2\times 175 = 560~ft^2$$

.
Dec 9, 2018

#1
+3576
+1
$$\text{The front surface is }15\times 4 = 60 ~ft^2\\ \text{The back surface is }15\times 10 = 150 ~ft^2\\ \text{The two sides are a }10\times 25~ft^2 \text{ rectangle minus a }\\ 6 \times 25 ~ft \text{ right triangle}\\ \text{Each side is thus }250 - 75 = 175~ft^2\\ \text{summing these we get }60+150+2\times 175 = 560~ft^2$$