A weather balloon pops and falls to Earth. The distance the weather balloon will fall is 15 feet the first second, 45 feet the next second, 75 feet the third second, and so on in an arithmetic sequence. What is the total distance the weather balloon falls in 8 seconds?

960 feet

Step-by-step explanation:

15 + 45 + 75 + 105 + 135 + 165 + 195 + 225 = 960

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right