## Algebra: A Combined Approach (4th Edition)

$2.7 \times 10^9$ gallons of water in an hour
$(7.5 \times 10^5) \times 3600$ $=(7.5 \times 10^5) \times (3.6 \times 10^3)$ $=27 \times 10^8$ $=2.7 \times 10^9$ gallons of water in an hour