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Chapter 1: Q53. (page 38)

Explain how inequalities can be used to compare phone plans.

Short Answer

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Step by step solution

01

Step 1. Given information.

Kuni is trying to decide between two rate plans offered by a wireless phone company.

Plan 1Plan 2Monthly  Access  Fee$35.00$55.00Minutes  Included150400Additional  Minutes4035

02

Step 2. Write the inequalities.

To compare these two rate plans, use inequalities.

The minutes included for plan 1 is less than plan 2. That is,

150>400

The additional minutes fee for plan 1 is greater than that of plan 2. That is,

40>35

03

Step 3. Explain why plan 1 cheaper than plan 2.

The monthly access fee for plan 1 is less than the fee for plan 2. That is,

$35<$55

This shows that plan might be cheaper than plan 2 if Kuni uses more than 150 minutes less than 400 minutes.

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