Chapter ISG, Problem 5.1.2.23P

To determine

To use a model to find number of minutes left on M’s Cellphone

Answer to Problem 5.1.2.23P

  $x\le 300$

(Minutes left on M’s cellphone is less than equal to 300)

Explanation of Solution

Given information:

An inequality is given:-

  $500-x\ge 200$

Calculation:

Let the number of minutes left on M’s cellphone be $x$

An inequality is given

  $500-x\ge 200$

On adding variable x on both sides

  $500-x+x\ge 200+x$

So,

  $500\ge 200+x$

On subtracting 200 from both sides

  $500-200\ge 200+x-200$

Hence,

  $300\ge x$

The final answer is

  $x\le 300$