The function y = 5.45 + 1.05(x + 7) can be used to determine the cost in dollars for a prepaid cell phone plan of x minutes. What is the rate of change for the cost, in dollars, with respect to the number of minutes purchased?
A.$1.05 per minute
B.$6.50 per minute
C.$7.35 per minute
D.$13.50 per minute
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