apr 8 9th grade

8/9/2019 Apr 8 9th Grade

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1 Multiply: (6a4b3c)(2ab4c2)

8a4b7c2

8a5b7c3

12a4b7c2

12a5b7c3

2 A human body has about 1.6 x 1011 red blood cells for each pound of bodyweight. Brian weighs 150 pounds.

Approximately how many red blood cells does Brian have in his body?

2.4 109

2.4 1011

2.4 1013

2.4 1322

3 Write this number in scientific notation.68,430,000

6.843 107

6.843 10-7

0.6843 104

68.43 107

4 Thirty-five percent of what number is 42?14.7

64.6

88.3

120

5 Evaluate the expression below.(5.6 109)(8.64 104)

4.8384 1012

4.8384 1013

4.8384 1014

4.8384 1035


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6 Write the equation of the line with slope ofm =

3

4

and passing through the point (6, 2).6x +

2y =

3

4

y =34

x +9

y =3

4x -

5

2

y =3

4x +

13

2

7 What is the relationship of the lines formed by the linear equations below?y =

-

1

2

x +

1

y = 2x + 1

They form parallel lines.

They form skew lines.

They form identical lines.

They form perpendicular lines.

8 The table below shows TV and VCR sales at a local appliance store during athree-month period.

Feb. Mar. Apr.

TV 25 22 31VCR 18

23

25

In May, sales for both TVs and VCRs were triple those in March.

Which of these matrices shows the TV and VCR sales for May?

9 What is the equation of the line that passes through the points (15, -3) and(15, 2)?

y = 15


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x = 15

y = -3x + 15

y = 2x - 15

10Use the distributive property to factor the expression below.14w - 28v + 35x

7(2w - 4v + 5)

7w(2 - 4v + 5)

7(2w - 4v - 5)

7(2w - 4v + 5x)

11Andrew paid an agency 10% of his first year's rent for finding him anapartment. His rent is $1,800 per month.

What is the amount of the commission that Andrew paid the agency?

$216

$900

$1,800

$2,160

12A garage charges $22 for eight hours of parking and $3.50 per hour for eachadditional hour. There is a special sales tax of 17% for parking fees. Jason

parked his car at the garage for 10 hours.

How much did Jason pay in sales tax?

$1.71

$4.34

$4.93

$5.95

13This year Sally paid $2,592.00 in taxes. Because of changes in the tax laws, shewill pay $1,296.00 next year.

By what percentage will Sally's taxes decrease next year?

5%

50%

100%

200%

14Jenny bought a new car that cost $16,300. The sales tax was 9.5%.How much did Jenny pay in sales tax?

$1,385.50


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$1,414.16

$1,548.50

$1,715.79

15Mary and Ralph had dinner at Carmine's restaurant. The price of the meal was$38.50, and the sales tax was 4%.

How much did Mary and Ralph pay in sales tax?

$1.48

$1.54

$1.93

$9.63

16Simplify this expression.7.92 10

-6

2.4 105

3.3 10-30

3.3 10-11

3.3 10-1

3.3 101

17Simplify this expression.(2.7 104) + (5.6 104)

8.3 100

8.3 104

8.3 108

8.3 1016

18What is -12 (-16)?-0.8

-0.75

0.75

0.8

19What is -19 + (-9)?-28

-10

10

28

20Jackson Middle School has 170 students, and 68 of them take Spanish.


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What percentage of the students take Spanish?

2.5%

33.3%

40%

60%

21Identify the equation that represents the following situation:Six times the sum of a number and 4 equals one less than the number.

6n + 4 = n - 1

n + 24 = 1 - n

6(n + 4) = 1 - n

6(n + 4) = n - 1

22Write an inequality to represent the following situation:Eight more than a number is at most the product of five and that number.

n + 8 > 5n

8 + n > 5 + n

8 + n < 5/n

n + 8 < 5n

23After reading 175 pages of a novel, Andrea has fewer than 35 remaining to finishthe novel.

Which inequality correctly represents this situation, if Andrea's novel has a total

ofxpages?

x + 35 < 175

x - 175 < 35

175 + x < 35

x - 175 > 35

24Amelia gets 4 points for each correct answer on her science quizzes, and sheloses 1 point for each wrong answer. On her quiz last week, Amelia earned 50

points and answered 25 questions.

Which system of equations correctly represents this situation?

4c - w = 50c + w = 20

4w - c = 20c + w = 50

4c - w = 50c + w = 25


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4w - 4c = 50c + w = 25

25Trisa's balance in her checking account is $75.00. She must deposit enoughmoney (x) in her account to be able to pay her telephone bill of $105.00.

Which inequality correctly represents this situation?75 + x > 105

75 - x < 105

105 + x < 75

105 - x > 75

Advanced MathematicsCopyright PLATO Learning, Inc. All rights reserved.

apr 8 9th grade

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