A pool is being drained for the winter. At 10 a.m there are 42,500 gallons in the pool. At 2 p.m, there are 34000 gallons in the pool. Find the average rate of change in gallong over this time interval
42.500/ 34.000=1.25
[ 42500 - 34000 ] gals / 4 hrs = 2125 gals/hr drained
