Answer:
3
Step-by-step explanation:
0.16 ft
v = 4/3 πr³
v = 4/3 × 3.142 × 1/3 × 1/3 × 1/3
v = 0.16 ft
350gallons /minute
D = minimun depth of mine
4D-250 = minimum gallon per minute required to pump
4(150)- 250= 350gallon/minute
it is D hope this helps