please help with these questions:

Problem 2. A cell phone plan charges $49.95 per month plus $14.02 in taxes, plus $0.40 per minute for calls beyond the 600-minute monthly limit. Write a piecewise-dened function to model the monthly cost C(m) (in $) as a function of the number of minutes used a: for the month. Problem 6. Given h(x) = vx +3 and j(2) = x - 2 2 2 - 9' find (x) and determine the domain of the function 6. 12