Given the function
g(x) = 6 − x2,
evaluate
g(x + h) − g(x)
h
, h ≠ 0.

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.