Expression Equations and Inequalities

The Roaming Cell Phone Company charges $15.00 per month plus $0.20 per minute of airtime usage.  If Juanita's monthly bill was $56.20, what is an equation that can be used to determine her total minutes (x)?

• 56.20 = 15 + 0.20x

• 56.20 =15 (0.20x)

• 56.20 = 15 + x + 0.20

• 56.20 = 0.20 + 15x

Five times Mike's age, increased by nine

• 5(x+9)

• 9(5+x)

• 9x+5

• 5x+9

A cookie jar starts off with 32 cookies in it, and each day 2 cookies are eaten. After a certain number of days, there are 14 cookies left in the jar. Which of the following equations represents the day, d, when there are 14 cookies in the jar?

• 32 - 2d = 14

• 32 + 2d = 14

• (32/2)d = 14

• (2/32)d = 14

Consider the expression 3n^2 + n + 2. Which is a coefficient?

• 2

• 3

• n

• 3n^2

Mathematical Equivalence

ON

Match the following

• Double shaded region

• inequality

• more than one line

• Expression

• has an inequaltiy symbol

• System of Inequalties

• no equal sign or inequality symbol

• Equation

• Has an equal sign

• System of Equations

"Twenty-four minus three times an integer, x, is less than x minus four."

Write an inequality, in terms of x, to represent this information.

Mathematical Equivalence

OFF

The room holds no more than 400 people. Which inequality represents the amount of people the room holds?

• P ≥ 400

• P ≤ 400

• P < 400

• P > 400

Michael needs at least an 80% on his test. Which inequality represents the grade that Michael can get on his test?

• P ≥ 80

• P < 80

• P > 80

• P ≤ 80

Which inequality represents the situation ten less than a number is no more than 30?

• 10 - x ⪯ 30

• x - 10 ⪯ 30

• 30 - x ⪯ 10

• x - 30 ⪯ 10