I believe it is 2.5, or 5/2
Answer:
2000 * 1.08 * 1.08 * 1,08 ....
well, since we are multiplying the same number over and over, let's just write

equals
$9321.91
Part A:
f(x) = 20x
Part B:
6 gallons
The correct answer is B) y = 120000x + 420000.
We multiply 120,000 by x since that is the cost per person per day, and x is the number of days. We add 420,000 because that is the one time cost of the round trip airfare.
H(17) = 17
Do you need help with the other 2?