The answer is 78 because when you add all the numbers it equals 780 and you need to divide the end sum by the amount of numbers added to get it. So in the end there were 10 numbers added to equal 780 so 780\10 equals 78
The descent after 16 seconds would be 672 feet, with the function -42•X and X=16 so -42•16=-672
The area equation is

, which when solved equals 50.24. That's the third answer on your list.
Hello there!
I hope you and your family are staying safe and healthy during this winter season!
See the attached picture for the answer!
Thanks!
~Garebear