Answer:
9.504×10⁹ ft³
Step-by-step explanation:
We are told the amount of water in cubic feet per second. We need it in cubic feet per hour, then multiply that amount by 24 to get the cubic feet of water that falls in a 24-hr period. Converting the seconds to hours:
The seconds label cancels out leaving us with a label in cubic feet per hour. That number, NOT in scientific notation (we'll do that at the end) is:
396000000 cubic feet per hour.
Multiply that by 24 and you get:
9504000000 cubic feet or
9.504×10⁹ cubic feet