Fresh features from the #1 AI-enhanced learning platform.Try it free
Fresh features from the #1 AI-enhanced learning platformCrush your year with the magic of personalized studying.Try it free
Question

# Communications The cost of using a telephone calling card is $\ 1.05$ for the first minute and $\ 0.38$ for each additional minute or portion of a minute. Graph the appropriate model. Determine the cost of a call lasting $18$ minutes and $45$ seconds.

Solution

Verified
Step 1
1 of 6

The appropriate model for the cost of using a telephone calling card for a call lasting $t$ minutes is:

$C(t)=1.05-0.38[-(t-1)]$

Here, we are asked to graph the model and determine the cost of a call lasting $18$ minutes and $45$ seconds. To graph the function, let us determine the transformation of the common function to obtain the new graph. And to find the cost of a call of the given time, convert the time into minutes and substitute the obtain value into the function and lastly evaluate for $C(t)$.

## Recommended textbook solutions #### Precalculus

6th EditionISBN: 9780134469140 (3 more)Robert F. Blitzer
12,394 solutions #### Precalculus

5th EditionISBN: 9780321837349 (1 more)Robert F. Blitzer
12,040 solutions #### Precalculus

6th EditionISBN: 9780618314348Larson, Robert P. Hostetler
9,388 solutions #### Precalculus

7th EditionISBN: 9780618643448 (18 more)Larson, Robert P. Hostetler
11,581 solutions