Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 4 - Proportions, Percents, and Solving Inequalities - 4.5 - Inequalities, Compound Inequalities, and Problem Solving - Problem Set 4.5: 77

Answer

He must shoot less than or equal to 77. The solution set is {x|x $\leq$ 77}.

Work Step by Step

Let x represent the score on the last day. The average for the five days is $\frac{82+84+78+79+x}{5}$. Because the average for the five days needs to be 80 or less, we solve the following inequality. $\frac{82+84+78+79+x}{5}$ $\leq$ 80 Multiply both sides by 5. 82+84+78+79+x $\leq$ 400 323 + x $\leq$ 400 x $\leq$ 77 He must shoot less than or equal to 77. The solution set is {x|x $\leq$ 77}.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.