7 Checkpoint 3: 7.AF.3

An equation is given. 3x - 6 = 27 What is the solution to the equation?

• 7

• 11

• 36

• 66

An equation is given. 0.5(x - 3) = 7.5 What is the solution to the equation?

• x = 15

• x = 18

• x = 12

• x = 9

An auditorium sets up chairs for a concert. - There are 250 chairs already set up. - The crew sets up 75 chairs per hour. - A total of 550 chairs are needed for the concert. Which equation can be used to determine h, the number of hours it will take to set up the total number of chairs?

• 325h = 550

• 325 = 550h

• 75h + 250 = 550

• 75 + 250h = 550

A class has 8 boys and x girls. Each student has 4 pencils. The total number of pencils the students have is 52. Part A Create an equation that models this situation.

• 4(8 + x) = 52

• 8 + 4x = 52

• 8x + 4 = 52

• 4x + 8 = 52

Solve: 4(8+x)=52

• 10

• 15

• 20

• 25

A baker needs flour to make bread and cookies. - He uses 3 cups of flour for the bread. - He needs 1 ½ cups of flour for each batch of cookies. - He uses a total of 12 cups of flour. Part A Create an equation that models the situation with x representing the number of batches of cookies the baker can make.

• 3 + 1.5x = 12

• 3x + 1.5 = 12

• 3 + 1.5 = 12x

• 3x + 1.5x = 12

How many batches of cookies can the baker make? Solve 3+1.5c=12

• 1 batch

• 2 batches

• 3 batches

• 4 batches

A shopper purchased 5 red shirts and x blue shirts. Each shirt costs 9.50. The total cost is 76.00. Select the equation that could model the purchase.

• 9.5(5) + x = 76

• 7 + 9.5(x) = 76

• 9.5(5 + x) = 76

• 9.5(5 + x) = (9.5)76

Compare the two methods used to solve the equation. Which student solved the equation correctly?

• They are both incorrect

• They are both correct

• Student A is wrong

• Student B is wrong