Logic puzzle math: intro to linear equations ASAP

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

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?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.