Mode, because mode is the number that shows up most often.
To find 8x397, I used the stack method.
a.) 397
<u> x 8 </u>
3176
b.) This method works best because it's easy to do, and the factors aren't too big to multiply by hand, unless it was like a billion times a million. But in this case, it's not, so it's perfectly fine to use the stack method.
I hope this helps and have a good night! :D
Descending means that the hot air balloon's height is changing at a negative rate. Multiply the rate of change per minute by the total amount of minutes.

The total change in altitude is
-960 feet.
Yes...the person's hypothesis could be correct.