Test 5, Unit 4 (4.16 - 4.33) Flashcards Preview

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

Flashcards in Test 5, Unit 4 (4.16 - 4.33) Deck (56):
1

   -6

+(-9)

--------

 

 

-15

2

   +5

x(-4)

-------

 

-20

3

+36 divided by +12

 

3

4

   -11

- (-18)

--------

 

7

5

   -9

x(-8)

------

 

72

6

45 divided by -5

 

-9

7

  15

-(+7)

-----

 

8

8

  31

+(-8)

-------

 

23

9

(12x3)(3xy2)

 

36x4y2

10

(40m3n) divided by (5m)

 

8m2n

11

square root of 100

 

10

12

33

 

27

13

25

 

32

14

negative square root of 49

-7

15

+square root of 64

 

 

+8

16

252

 

625

17

square root of 81

 

9

18

square root of 1,225

 

96

19

4x + 6 = 34

4x + 6 - 6 = 34 - 6

4x/4 = 28/4

x = 7

20

x/4 = 8 * 3

 

x/4 = 24

4 * x/4 = 24 * 4

x = 96

21

2x2 + 3x2

5x2

22

3y3 + 2x2y + 4x2y + 5y3

 

8y3 + 6x2y

23

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

 

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

1a2b + 1ab

write this as:

a2b + ab

24

m3 + m2 + 2m2 - m3

 

3m2

25

x2 + 2x2 - 12 - 15

 

3x2 - 27

26

x = 8 + 5

 

x = 13

27

3x = 15

 

3x/3 = 15/3

x = 5

28

x/5 = 12

 

5 * x/5 = 12 * 5

x = 60

29

4x - 6 = 2x + 10

 

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

2x - 6 + 6 = 10 + 6

2x = 16

x = 8

30

.3x = 18

 

.3x * 10 = 18 * 10

3x = 180

3x/3 = 180/3

x = 60

 

31

The principle square root of 144 is -12

 

F

32

A negative number plus a negative number is a positive number

 

F

33

The cube root of 8 is 2

 

T

34

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

 

T

35

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

 

F

36

The square root of 17 is an irrational number

 

T

37

Only whole numbers are rational numbers

 

F

38

x5 means x + x + x + x + x

 

F

39

The number -13 is greater than -15

 

T

40

The absolute value of -8 is 8

 

T

41

multiply 6x by 3x3y

18x4y

42

find the positive square root of 196

 

14

43

divide -18 by 3

 

-6

44

write the absolute value of -9

 

9

45

divide y5 by y7

 

1 over y2

 

46

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

 

3

47

Add +5 and -5

 

0

48

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

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

4 (8) + 12(-4) =

32 + (-48) =

-16

49

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

 

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

0

50

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

 

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

16 - .25 =

15.75

51

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

 

x + 8 = 24

x + 8 - 8 = 24 - 8

x = 16

52

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

 

x + 2x = 36

3x = 36

3x/3 = 36/3

x = 12

53

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.

 

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

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

 

3x = 21

3x/3 = 21/3

x = 7

55

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

 

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

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

x  0  1  2  3  4  5  6  7  8  9 

Y

 

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