Please help I don’t understand it

The factorization of 8x3 -125 is (2x-5)(jx2 +kx+25)

What is the average rate of change for this function for the interval from x=2 to x=4 ?

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?