Answer
$y=0.4 \times 4^x$
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, $y=0.4 \times 4^x$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
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
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