Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 7 Exponential and Logarithmic Functions - 7.7 Write and Apply Exponential and Power Functions - 7.7 Exercises - Skill Practice - Page 533: 10


$y=0.4 \times 4^x$

Work Step by Step

Here, we have $6.4 =ab^2; 409.6 =ab^5$ $\dfrac{6.4}{b^{2}}=409.6$ This gives: $b=\sqrt [3] {64} =4$ Then, $a= \dfrac{6.4}{16} =0.4$ Hence, $y=0.4 \times 4^x$
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