Please like please help me ?!!

What is the gcf of 20c^3-5c^4+30c^6

Identify the parent function that can be used to graph the function f(x)=3(x-9)2

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.