Missed Questions

Norah has never lost a tooth, but she will receive $0.75 from the tooth fairy each time she loses a tooth. Kate has $1.25 from the tooth fairy, and she gets $0.25 each time she loses a tooth. Which inequality could be used to find x, the number of teeth that each girl would have to lose for Norah to have at least as much money from the tooth fairy as Kate?

• 0.75x ≥ 1.25 + 0.25x

• 0.75x ≥ 1.25 – 0.25x

• 0.75x ≤ 1.25 + 0.25x

• 0.75x > 1.25 + 0.25x

Solve the linear equation below.

 $-\frac{1}{5}x-18=2$  

• x = -100

• x = 0.25

• x = 6

• x = 100

Austin solved the equation as shown below. Which describes the error that Austin made in his work?

Austin's Work:

-3 + 7x – 9 + 8x = 54

15x – 6 = 54

15x = 60

x = 4

• Austin did not combine 7x and 8x correctly.

• Austin did not combine -3 and -9 correctly.

• Austin did not divide correctly.

• Austin did not make an error in his work.

A website offers video game downloads for $4.75 each. Customers can also subscribe for an annual fee $54, and video game downloads would cost $2.50 each. Write and solve an equation to find the number of video games a customer would have to download in a year for the two options to be equal.

• $4.75x-54=2.5x$

• $4.75x+54=2.5x$

• $4.75x=54+2.5x$

• $4.75x=54-2.5x$

Solve the equation below. $-4-0.2x+11=-0.8x+10$  

• x = 19

• x - 1.33

• x = 2

• x = 5

Keith is in a hot air balloon that is 200 feet above the ground and is ascending 1.5 feet per second. Erica is in a hot air balloon that is 548 feet above the ground and is descending 1.40 feet per second. After how many seconds will the hot air balloons be the same number of feet above the ground?

• 52 seconds

• 120 seconds

• 75 seconds

• 3,480 seconds