## Intermediate Algebra for College Students (7th Edition)

$4.2 \times 10^{4}$
Multiply the corresponding parts to obtain: $=(1.4 \cdot 3) \times (10^{15} \cdot 10^{-11}) \\=4.2 \times 10^{15+(-11)} \\=4.2 \times 10^{4}$