Find the Average Rate of Change of the Function From x

Multiple Choice

Find the average rate of change of the function from $$x _ { 1 } \text { to } x _ { 2 }$$
-A deep sea diving bell is being lowered at a constant rate. After 12 minutes, the bell is at a depth of 400 ft. After 45 minutes the bell is at a depth of 1900 ft. What is the average rate of lowering per minute? Round to the nearest hundredth is needed.

A) 45.5 ft per minute
B) 0.02 ft per minute
C) 33.3 ft per minute
D) 42.2 ft per minute