# Chapter 1 - Review Exercises: 109

$1.26 \times 10^8$

#### Work Step by Step

Multiply 4.2 and 3 together, then multiply the powers of 10 together to obtain: $=12.6 \times 10^{13+(-6)} \\=12.6 \times 10^7$ Simplify to put the number in scientific notation. $=1.26 \times 10^{7+1} \\=1.26 \times 10^8$

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