Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 7 - Measurement - Review Exercises: 19

Answer

a.) 4153(1 )/3 yards (exact), 4153.3 yd (rounded) b.) 2.4 mile (rounded)

Work Step by Step

Given, The average depth of the world’s oceans is 12,460 ft a.) To find, the average depth in yards As we know 3 feet (ft) = 1 yard (yd) We are converting from a smaller unit to a larger unit (a foot is smaller than a yard) so divide. 12,460 feet = (12,460 )/3 = 4153(1 )/3 yards = 4153.33 yd b.) What is the average depth in miles, to the nearest tenth? Use a unit fraction with feet (the unit for your answer) in the numerator, and yards (the unit being changed) in the denominator. Because 5280 feet (ft) = 1 mile (mi), the necessary unit fraction is (1 mile)/( 5280 feet) Multiply 12,460 ft times the unit fraction. 12,460 ft * (1 mile)/( 5280 feet) = 2.35 mile = 2.4 mile (rounded)
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