Math In Focus Course 2 Chapter 4 Test Review

The following shows the amount of gasoline used, g gallons, for traveling a distance, d miles.

d 25 50 125

g 1 2 5

Which of the following statements are not correct?

• g and d are in direct proportion

• the constant is 25, which means you get 25 miles per gallon

• The relationship between d and g can be written as

  d*g=25

• The ratio d/g is the same for all ordered pairs shown

• The relationship between d and g can be written as g=25d

Answer explanation

This is a direct relationship with a constant of 25.

d*g=25 is inverse

g=25d would mean distance times 25 gives gallons

All items in a store were sold at 30% discount during a sale. Zoey paid $70 for a jacket. What was the selling price before discount?

• $73.00

• $100.00

• $30.00

• $49.00

• $21.00

The price of a watch increased from $2,000 in 2009 to $10,000 in 2019. What was the percent increase in its price?

• 400%

• 500%

• 40%

• 50%

• 450%

Which of the following models the relationship between s and t?

• st=250

• s=250/t

• t=250/s

• t=250s

• st=1/250

How can you tell if a graph is showing a proportional relationship?

• Goes through the origin.

• Straight line

• Curves toward infinity

• Never touches the x and y axis

• Goes through the y-axis on a positive counting number

A rectangle has an area of 40 square units.

Which of the following are true?

• k=40

• This is a inverse relationship

• This is a direct relationship

• b=40h

• b=40/h

The number of apples for sale at an orchard is directly proportional to the number of crates used to pack the apples. There are 150 apples in 5 crates. How many apples are in 4 crates?

• 120 apples

• 30 apples

• 187.5 apples

• 200 apples

• 80 apples

y is inversely proportional to x, and y=25 when x=3

Which of the following is true?

• k=75

• k=25/3

• When y = 5, x is 15

• When y = 5, x = 125/3

• y=75/x

David has 350 stamps. He bought 14% more stamps. How many stamps does he have now?

• 49

• 399

• 301

• 414

• 387

Ivan had some beads. He used 40% of them to decorate a handbag and 30% of the remaining to decorate a wallet. What percent of his beads were used to decorate the wallet?

• 0.6 * 0.3 = 0.18

  18%

• 0.6 * 0.7 = 0.42

  42%

• 0.4 * 0.3 = 0.12

  12%

• 0.4 * 0.7 = 0.28

  28%