Schwimmer's cost for cable television is provided by C = 75 + 25 x, , where x is number of months of service.
i) Graph C = 75x + 25, for x \leq 50.
ii) From graph of C, evaluate Schwimmer's cost for thirty months of service.
iii) If Schwimmer's total cost for cable television is $975, evaluate number of months of service.