PSABM4ZY - Practice---Acc7.3 Lesson 12 Solving Problems about Percent Increase or Decrease (7.EE.A.2, 7.EE.B.3, 7.EE.B.4, 7.EE.B.4.a)

Select all expressions that show x increased by 35%.

 A. D. B. E. C. F.

Select all that apply:
Part A)

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(x20)=830

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

Select one:
Part B)

Which story is represented by 0.9(x20)=830?

Select one:
Part C)

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

Part D)

Solve 0.920 830

x =  ____

Type your answer below as a number (example: 5, 3.1, 4 1/2, or 3/2):
Part E)

What does this solution mean in this situation?

Part F)

Solve 0.9(x-20)=830

Fill in the blank:

x= ____

Type your answer below as a number (example: 5, 3.1, 4 1/2, or 3/2):
Part G)

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.

Select all that apply:

Which scale is equivalent to 1 cm to 1 km?

Select one:

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.