I think the answer would be 56. Bc the first job has 8 different people who could get the job and then once someone is chosen for that slot the next teaching position only has 7 candidates. So you would take 8*7 which equals 56.
The correct answer is D
28 ways to fill the 2 positions
There are 8 people who can fill the first position and then there are 7 people who can fill the second position (since the first position is filled)
8 * 7 = 56
But order does not matter, so we divide by the number of positions
(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).