Select **all** expressions that show x increased by 35%.

A. | D. | ||

B. | E. | ||

C. | F. |

Here are two stories:

- The initial freshman class at a college is 10% smaller than last year’s class. But then during the first week of classes, 20 more students enroll. There are then 830 students in the freshman class.
- A store reduces the price of a computer by $20. Then during a 10% off sale, a customer pays $830.

Here are two equations:

- 0.9x+20=830
- 0.9(x−20)=830

Which story is represented by 0.9x+20=830?

Which story is represented by 0.9(x−20)=830?

Explain why one equation has parentheses and the other doesn't.

Solve 0.9x + 20 = 830

x = ____

What does this solution mean in this situation?

Solve 0.9(x-20)=830

Fill in the blank:

Round your answer to the hundredths (second) decimal place.

x= ____

What does this solution mean in this situation?

Select all the expressions that are the result of decreasing *x* by 80%.

A. | D. | ||

B. | E. | ||

C. |

Which scale is equivalent to 1 cm to 1 km?

Triangle* DEF* is a right triangle, and the measure of angle D is . What are the measures of the other two angles?

*Enter your answer with the larger angle first and then the smaller angle, separated with a comma without spaces. *

*Example: 85,60. *