Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 8 - Test - Page 388: 17


(a) 20 sheets (b) $256

Work Step by Step

(a) We can find the total area of the four walls: $A_w = 2\times (8~ft)(12~ft)+2\times (8~ft)(16~ft)$ $A_w = 448~ft^2$ We can find the area of the ceiling: $A_c = (12~ft)(16~ft)$ $A_c = 192~ft^2$ The total area is $448~ft^2+192~ft^2$ which is $640~ft^2$ We can find the required number of sheets of drywall: $\frac{640~ft^2}{(4~ft)(8~ft)} = 20~sheets$ (b) We can find the cost: $cost = (\$0.40/ft^2)(640~ft^2) = \$256$
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