Question 181553
if a phone plan charges a flat rate of $20 per month plus .50c per call.
Write an equation of the function. 
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Bill = $20 + $0.50*Calls
B = 20 + C/2  (in dollars), or
B = (2000 + 50C)/100 (in dollars), or
B = 2000 + 50C (in cents)