Answer
$$4.2 \times 10^4$$
Work Step by Step
\begin{align}
(1.4 \times 10^{15})(3 \times 10^{-11}) & = (1.4 \times 3)(10^{15} \times 10^{-11})\\ &= 4.2 \times 10^{15-11} \\ &=4.2 \times 10^{4}
\end{align}
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.2 - Exponents and Scientific Notation - Exercise Set - Page 30: 90
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