Answer
$7.61 \times 10^{5}$
Work Step by Step
Step 1:
$863 \times [1255 - (3.45 \times 108)]$
First simplify what is in the parentheses using multiplication significant figure rules.
$863 \times [1255 - (373)]$
Step 2:
Simplify what is in the brackets using subtraction significant figure rules.
$863 \times [882]$
Step 3:
Using multiplication significant figure rules finish the last step to yield the answer:
$7.61 \times 10^{5}$
