# The internet bookstore charges at given orders. ### Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071 ### Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071

#### Solutions

Chapter 2.1, Problem 77E

(a)

To determine

## To find: The internet bookstore charges at given orders.

Expert Solution

Internet bookstore charges at order C(75) is 90 , at order C(90) is 105 , order C(100) is 100 , at order C(105) is 105 .

### Explanation of Solution

The given function is,

C(x)={x+15ifx<100xifx100

Function for order $75 is, C(x)=x+15 Substitute 75 for x in the above function to find the value of C(75) , C(x)=x+15=75+15=90 So, internet bookstore charges at order C(75) is 90 . Function for order$90 is,

C(x)=x+15

Substitute 90 for x in the above function to find the value of C(90) ,

C(x)=x+15=90+15=105

So, internet bookstore charges at order C(90) is 105 .

Function for order $100 is, C(x)=x Substitute 100 for x in the above function to find the value of C(100) , C(x)=100 So, internet bookstore charges at order C(100) is 100 . Function for order$105 is,

C(x)=x

Substitute 105 for x in the above function to find the value of C(105) ,

C(x)=105

So, internet bookstore charges at order C(105) is 105 .

Hence, internet bookstore charges at order C(75) is 90 , at order C(90) is 105 , order C(100) is 100 , at order C(105) is 105 .

(b)

To determine

### To explain:  Answer represent in part (a).

Expert Solution

There are no shipping charges at order $100 or more than$100.

### Explanation of Solution

From part (a),

Internet bookstore charges at order C(75) is 90 , at order C(90) is 105 , order C(100) is 100 , at order C(105) is 105 .

There are no shipping charges at order $100 or more than$100.

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