Lesson 19: Practice Problems
Problem 1
Solve
Problem 2
Lin is solving the inequality
How can Lin determine whether
Problem 3
A cell phone company offers two texting plans. People who use plan A pay 10 cents for each text sent or received. People who use plan B pay 12 dollars per month, and then pay an additional 2 cents for each text sent or received.
Write an inequality to represent the fact that it is cheaper for someone to use plan A than plan B. Use
to represent the number of texts they send. Solve the inequality.
Problem 4
Clare made an error when solving
Describe the error that she made.
Problem 5
Diego’s goal is to walk more than 70,000 steps this week. The mean number of steps that Diego walked during the first 4 days of this week is 8,019.
Write an inequality that expresses the mean number of steps that Diego needs to walk during the last 3 days of this week to walk more than 70,000 steps. Remember to define any variables that you use.
If the mean number of steps Diego walks during the last 3 days of the week is 12,642, will Diego reach his goal of walking more that 70,000 steps this week?
Problem 6
What is the solution set of the inequality