Provide an appropriate response. An airport limo service charges riders a fixed charge of $18 plus $4.00 per mile. a. Write a cost function, 
, of riding in a limo for x miles.b. Write the average cost function, C, riding in a limo for x miles.c. How many miles must a rider go to have an average cost per mile of $4.90?
A. a. C(x) = 18 + 4x;
b. 
(x) = 
c. 20 mi
B. a. C(x) = 4 + 18x
b. 
(x) = 
c. 24.4 mi
C. a. C(x) = 4 + 18x
b. 
(x) = 
c. 45 mi
D. a. C(x) = 18 + 4x
b. 
(x) = 
c. 4.4 mi
Answer: A
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+ 
tan-1 
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B. ln 
+ 
tan-1 
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C. 3 ln 
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A. 
B. 
C. 
D. 
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