Write a cost function for the problem. Assume that the relationship is linear.
-A cable TV company charges $21 for the basic service plus $7 for each movie channel. Let C(x)be the total cost in dollars of subscribing to cable TV, using x movie channels.
A)C(x)= 7x + 21
B)C(x)= 21x + 7
C)C(x)= 21x - 7
D)C(x)= 7x - 21

Question

Quizplus · Accepted Answer

The cost function C(x) = 7x + 21 correctly represents the total cost as a function of x movie channels, where $21 is the fixed cost for basic service and $7 is the variable cost per movie channel.

Write a Cost Function for the Problem