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8th Math - Pre-Algebra > Test 5, Unit 4 (4.16 - 4.33) > Flashcards

Test 5, Unit 4 (4.16 - 4.33) Flashcards

1
Q

-6

+(-9)

A

-15

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2
Q

+5

x(-4)

A

-20

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3
Q

+36 divided by +12

A

3

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4
Q
  • 11
  • (-18)
A

7

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5
Q

-9

x(-8)

A

72

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6
Q

45 divided by -5

A

-9

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7
Q

15

-(+7)

A

8

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8
Q

31

+(-8)

A

23

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9
Q

(12x3)(3xy2)

A

36x4y2

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10
Q

(40m3n) divided by (5m)

A

8m2n

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11
Q

square root of 100

A

10

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12
Q

33

A

27

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13
Q

25

A

32

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14
Q

negative square root of 49

A

-7

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15
Q

_+_square root of 64

A

_+_8

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16
Q

252

A

625

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17
Q

square root of 81

A

9

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18
Q

square root of 1,225

A

96

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19
Q

4x + 6 = 34

A

4x + 6 - 6 = 34 - 6

4x/4 = 28/4

x = 7

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20
Q

x/4 = 8 * 3

A

x/4 = 24

4 * x/4 = 24 * 4

x = 96

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21
Q

2x2 + 3x2

A

5x2

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22
Q

3y3 + 2x2y + 4x2y + 5y3

A

8y3 + 6x2y

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23
Q

4a2b - 2ab + 4ab - ab - 3a2b

A

4a2b - 3a2b + 4ab - 2ab - ab

1a2b + 1ab

write this as:

a2b + ab

24
Q

m3 + m2 + 2m2 - m3

A

3m2

25
Q

x2 + 2x2 - 12 - 15

A

3x2 - 27

26
Q

x = 8 + 5

A

x = 13

27
Q

3x = 15

A

3x/3 = 15/3

x = 5

28
Q

x/5 = 12

A

5 * x/5 = 12 * 5

x = 60

29
Q

4x - 6 = 2x + 10

A

4x - 2x - 6 = 2x - 2x + 10

2x - 6 + 6 = 10 + 6

2x = 16

x = 8

30
Q

.3x = 18

A

.3x * 10 = 18 * 10

3x = 180

3x/3 = 180/3

x = 60

31
Q

The principle square root of 144 is -12

A

F

32
Q

A negative number plus a negative number is a positive number

A

F

33
Q

The cube root of 8 is 2

A

T

34
Q

The algebraic expression 3x2 - 6 can be read as six less than three times x squared

A

T

35
Q

In /25 (the square root of 25) , the 25 is called an index

A

F

36
Q

The square root of 17 is an irrational number

A

T

37
Q

Only whole numbers are rational numbers

A

F

38
Q

x5 means x + x + x + x + x

A

F

39
Q

The number -13 is greater than -15

A

T

40
Q

The absolute value of -8 is 8

A

T

41
Q

multiply 6x by 3x3y

A

18x4y

42
Q

find the positive square root of 196

A

14

43
Q

divide -18 by 3

A

-6

44
Q

write the absolute value of -9

A

9

45
Q

divide y5 by y7

A

1 over y2

46
Q

write the number of terms in 6x2y + 2xy + 8

A

3

47
Q

Add +5 and -5

A

0

48
Q

Evaluate 4x3 + 6xy if x is 2 and y is -4

A

4(23) + 6(2)(-4) =

4 (8) + 12(-4) =

32 + (-48) =

-16

49
Q

Evaluate 3abc if a = 6, b = -4, c = 0

A

3(6)(-4)(0) =

0

50
Q

Evaluate x2 - y2 if x = -4 and y = .5

A

(-4)2 - (.5)2 =

16 - .25 =

15.75

51
Q

A certain number plus 8 equals 24. What is the number?

A

x + 8 = 24

x + 8 - 8 = 24 - 8

x = 16

52
Q

Mary and Marsha have a combined age of 36. Marsha is twice as old as Mary. How old is Mary?

A

x + 2x = 36

3x = 36

3x/3 = 36/3

x = 12

53
Q

Separate the number 53 into three parts so that the second number is 3 less than the first number and the third number is twice the first number. Give the value of the second number.

A

x + x - 3 + 2x = 53

4x - 3 = 53

4x - 3 + 3 = 53 + 3

4x = 56

4x/4 = 56/4

x = 14

The second number is 3 less than the first number, so the first number is 14, the second is 11.

14 - 3 = 11

54
Q

Three times a certain number is 21. What is the number?

A

3x = 21

3x/3 = 21/3

x = 7

55
Q

Elaine is 7 years older than Jane. Their combined age is 23. How old is Elaine?

A

x + x + 7 = 23

2x + 7 = 23

2x + 7 - 7 = 23 - 7

2x = 16

2x/2 = 16/2

x = 8

x + 7 = 15, Elaine is 15.

56
Q

complete the table and graph for the formula Y = 2x

x 0 1 2 3 4 5 6 7 8 9

Y

A

Y = 2x, so multiply each number in the x line by 2 to get the Y line.

x 0 1 2 3 4 5 6 7 8 9

Y 0 2 4 6 8 10 12 14 16 18

8th Math - Pre-Algebra (43 decks)

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