Loudon County Phone Company charges a $10 monthly fee for the first 200 minutes of usage plus a fee of $0.05 per minute for every minute over 200 minutes.(So, there is no monthly charge for 0 - 200 minutes of usage per month).

(a) Write an equation that can be used to determine a subscriber's monthly phone bill, B(x), given the amount of minutes called, x.(Assume that the subscriber will make over 200 minutes of calls)

(b) Determine the subscriber's bill if the total minutes used in a month was 650. Show work.

(c) Determine the number of minutes used if the subscriber's monthly bill was $84.Show work.