# Lesson 8

Percent Increase and Decrease with Equations

Let’s use equations to represent increases and decreases.

### Problem 3

In a video game, Clare scored 50% more points than Tyler. If $$c$$ is the number of points that Clare scored and $$t$$ is the number of points that Tyler scored, which equations are correct? Select all that apply.

A:

$$c = 1.5t$$

B:

$$c = t + 0.5$$

C:

$$c = t + 0.5t$$

D:

$$c = t + 50$$

E:

$$c = (1 + 0.5)t$$

### Problem 4

Draw a diagram to represent each situation:

1. The number of miles driven this month was a 30% decrease of the number of miles driven last month.

2. The amount of paper that the copy shop used this month was a 25% increase of the amount of paper they used last month.

(From Unit 4, Lesson 6.)

### Problem 5

Which decimal is the best estimate of the fraction $$\frac{29}{40}$$?

A:

0.5

B:

0.6

C:

0.7

D:

0.8

(From Unit 4, Lesson 5.)

### Problem 6

Could 7.2 inches and 28 inches be the diameter and circumference of the same circle? Explain why or why not.

(From Unit 3, Lesson 3.)