Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter R - Review of Basic Concepts - R.5 Rational Expressions - R.5 Exercises - Page 55: 89


0 miles

Work Step by Step

This problem can be solved using the formula given in the problem: Distance = \frac{7-x}{0.639x + 1.75}. Since the question asks about the distance of a river that has an altitude of 7000 ft, convert the 7000 ft into thousands of feet for the variable x by dividing 7000 by 1000. Therefore, x = 7. Now, substitute 7 for x into the formula, which gives the expression: \frac{7-7}{0.639(7) + 1.75} Next, simplify the expression, and get the distance. \frac{7-7}{0.639(7) + 1.75} = \frac{0}{4.473 + 1.75} = \frac{0}{6.223} = 0 As a result, the distance from the origin of the Nile when the river has an altitude of 7000 ft is 0 miles.
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