Question

A pool initially contains 1,385 cubic feet of water. A pump begins emptying the  water at a constant rate of 20 cubic feet per minute. Which of the following functions best approximates the volume v(t), in cubic feet, of water in the  pool t minutes after pumping begins, for 0 ≤ t ≤ 69?

1. v(t) = 1,385 − 20t
2. v(t) = 1,385 − 69t
3. v(t) = 1,385 + 20t
4. v(t) = 1,385 + 69t