Unit 2 Review

Percent Change

100

An interest rate increases from 3% to 7%. What is the change in percentage points?

4

200

An interest rate decreases from 10% to 6%. What is the percent change?

40%

300

A christmas tree which used to cost 1000 kr is now being sold for 700 kr. What is the percent decrease of the price?

30%

400

Will buys a fancy cake for 450 kr and Clay buys a different cake for 300 kr. In percent, how much more expensive was Will's cake than Clay's?

50%

500

A store is having a sale on puzzles. A puzzle which was already 10% off is put on sale for another 10% off. What is the total percent decrease in the price of the puzzle?

19%

Change Factor

100

What is the förändringsfaktor for a 23% increase?

1.23

200

What is the förändringsfaktor for a 34% decrease?

0.66

300

An items is put on sale for 15% off. How can you calculate the new price of the item using förändringsfaktorn?

The original price x 0.85

400

An apartment's rent was 21 000 per month before being increased by 5%. How can you calculate the new price of the rent using förändringsfaktor?

21 000 x 1.05

500

The price of shoes decreases by 20% and then by another 20%. Is the total decrease more than, less than, or equal to a 40% decrease of the original price?

Less than

Year 9 Unit 1

100

In the formula for the equation of a line, what does the k-value represent?

slope / gradient/ lutning

directional coefficient /riktningskoeffecienten 

200

In the formula for the equation of the line, which variable represents the y-intercept?

m

300

If a line has a gradient of 2 and a y-intercept of 5, what is the equation of the line?

y = 2x + 5

400

What is the gradient of an equation with points (-4, 13) and (1, -2)?

-3

500

What is the x-intercept of the line y = 6x - 24

4

Year 9 Unit 2

100

Factorize fully

6a + 18

6(a + 3)

200

Multiply these binomials

(x + 6)(2x + 3) 

2x² + 15x + 18

300

Simplify 

(4b + 16) / 2

2b + 8 

400

Factorize

x² - x - 42

(x + 6)(x - 7)

or 

(x - 7)(x + 6)

500

Solve for x: 

(3x + 9) / 4 = 6

x = 5

Blast from the Past

100

Find the mean of the following data set: 

2    6    9    13

7,5

200

What year did Nirvana appear on MTV unplugged?

1993

300

In probability what is an independent event (oberoende händelse)? 

When previous events do not impact the current event. 

400

What year was Ms Ohlstrom born? 

1984

500

What is the formula for finding the total amount earned with compound interest? 

Total amount earned = Principal(Change Factor)^x

Principal= Starting amount

x= time (years)