Cell phone company Y charges a $10 start up fee plus $0.10 per minute, x. Cell phone company Z charges $0.20 per minute, x, with no start up fee. Which function represents the difference in cost between company Y and company Z?

A.) f (x) = - 0.10x-70

B.) f (x) = - 0.10x+10

C.) f (x) = 10x-0.10

D.) f (x) = 10x+0.10

Question

Misael Glenn

Mathematics

8 July, 07:37

Cell phone company Y charges a $10 start up fee plus $0.10 per minute, x. Cell phone company Z charges $0.20 per minute, x, with no start up fee. Which function represents the difference in cost between company Y and company Z?

A.) f (x) = - 0.10x-70

B.) f (x) = - 0.10x+10

C.) f (x) = 10x-0.10

D.) f (x) = 10x+0.10

+5

Answers (1)

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Fernando Boone · Answer 1

B.

There is a 10 cent difference in the cost per minute, which is where the -.10x comes from. There is also a 10 dollar difference in the start up fees, which gives you the + 10.

So, if you were to choose Cell phone company Z, you would lose 10 cents per minute, but save gain 10 dollars at the beginning. - 10x+10