Test 8, Unit 10 Flashcards Preview

7th math > Test 8, Unit 10 > Flashcards

Flashcards in Test 8, Unit 10 Deck (50):
1

Express algebraically. 5 more than x

5 + x

2

Express algebraically. 8 less than n

n - 8

3

Express algebraically. 2 more than the product of 4 times m

4m + 2

4

Express algebraically. x squared minus y cubed

x(tiny)2 - y(tiny)3

5

the square root of s

s (with a square root sign over it)

6

T = 3x + 2 Find T if x = 1

T = 5

7

T = 3x + 2 Find T if x = 1/3

T = 3

8

T = 3x + 2 Find T if x = 4

T = 14

9

4(3 + 6) - 9 =

4(9) - 9 =
36 - 9 =
27

10

5 + 3 * (15 - 8) =

5 + 3 * 7 =
5 + 21 =
26

11

(12 - 2 * 3) over 4 =

(12 - 6) over 4 =
6 over 4 =
3/2 or 1 1/2

12

6 to the 3rd power (cubed)

6 x 6 x 6 =
216

13

2 to the 4th power

2 x 2 x 2 x 2 =
16

14

8 squared

8 x 8 =
64

15

square root of 64

8
because 8 x 8 = 64

16

square root of 100

10

17

square root of 25

5

18

x + 4 = 20/2

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

19

x - 7 = 3 * 2

x - 7 = 6
x - 7 + 7 = 6 + 7
x = 13

20

5x = 20

x = 20/5
x = 4

21

2/3x = 8

3/2 * 2/3x = 8 * 3/2
x = 24/2
x = 12

22

x/4 + 3 = 7

x/4 +3 - 3 = 7 - 3
x/4 = 4
x/4 * 4 = 4 * 4
x = 16

23

3x - 6 = 12/4

3x - 6 + 6 = 3 + 6
3x = 9
x = 3

24

19 + (-6) =

same as 19 - 6
13

25

-5 + (-4) =

-9

26

12 - (-9) =

same as 12 + 9 (2 negatives cancel making a +)
21

27

(-6) - (+8) =

-14

28

6(-5) =

when multiplying 1 - & 1 + answer is -
-30

29

-8(-4) =

when multiplying 2 - answer is +
32

30

14 - (+5) =

same as 14 - 5
9

31

-36/-6

when dividing 2 - answer is +
6

32

-64/8

when dividing 1 - & 1 + answer is -
-8

33

-12/-2 - (-8) =

6 + 8 =
14

34

8 + (-8) =

same as 8 - 8
0

35

5 - 3 - 2 - 4 - 1 =

5 - 3 - 2 - 4 - 1 =
2 - 2 - 4 - 1 =
0 - 4 - 1 =
-4 - 1 =
-5

36

square root of 576

24

37

square root of 2,916

54

38

T or F 5(tiny 1) = 5

true

39

T or F 5(tiny 0) = 0

false

40

T or F Order of operations says to simplify within parentheses first.

true

41

T or F The division axiom states that both sides of an equation can be divided by the same number, except 0, without changing the value of the equation.

true

42

T or F The algebraic expression xy has two terms.

false

43

T or F A number and a variable written side by side as in 3n indicate multiplication.

true

44

T or F Division in algebra is usually shown using the fraction bar.

true

45

T or F The absolute value of -8 is -8.

false

46

T or F P = 2L + 2w is an example of a formula.

true

47

T or F -9 is greater than 0.

false

48

T or F The sum of two negative numbers is a positive number.

false

49

Three times a number is 33. What is the number?

3n = 33
n = 11

50

Four less than twice a number is 20. What is the number?

2n - 4 = 20
2n = 24
n = 12