Answer
$$588\times 10^{12}.$$
Work Step by Step
By subtracting the exponents and dividing the like terms, we have
$$\frac{ 70.5\times 10^6 }{120\times 10^{-9}}=\frac{ 70.5}{120} \times 10^{6-(-9)} \\
=0.588\times 10^{15} =588\times 10^{12}.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 2 - Section 2.7 - Engineering Notation - Exercises - Page 130: 29
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