Answer
$\frac{15}{x^3}$
Work Step by Step
$(5x^{-7})(3x^4)=(5)(3)(x^{(-7+4)})=15x^{-3}=\frac{15}{x^3}$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Appendix B - Exercise Set - Page 742: 41
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