Chapter 1, Problem 51QP

Carry out the following operations as if they were calculations of experimental results, and express each answer in the correct units with the correct number of significant figures:

$\left(\text{a}\right)\text{7}\text{.310 km ÷ 5}\text{.70 km }\left(\text{b}\right)\text{(3}{\text{.26 × 10}}^{\text{-3}}\text{mg) - (7}{\text{.88 × 10}}^{\text{-5}}\text{mg) }\left(\text{c}\right)\text{(4}{\text{.02 × 10}}^{\text{6}}\text{dm) ÷ (7}{\text{.74 × 10}}^{\text{7}}$