Question

A phone company charges for service according to the formula: C(n) = 13 +0.07%, where n is the number of minutes

talked, and C(n) is the monthly charge, in dollars.

The slope in this equation is:

The slope's units are:

Dollars

Minutes per Dollar

Minutes

Dollars per Minute

Answer 1

0.07

dollar per minute

Explanation:

Given the charging formula :

C(n) = 13 +0.07n

n = number of minutes talked, and

C(n) = monthly charge, in dollars

The slope is the change in amount charged per change in the number of minutes talked.

Also, from The slope intercept equation :

y = mx + c

Comparing the equation :

0.07n = mx

m = 0.07

Since, The slope is the change in amount charged per change in the number of minutes talked.

Amount charged in dollars, talk time measured in minutes ;

Unit = dollar per minute