2.1-2.4 Dimensions Math 7A

John is two pounds heavier than before

+2 lbs

Mary is 3 lb lighter

-3 lbs

A withdrawal of $2,800

-$2,800

A deposit of $1,650

+$1,650

If -4 mph denotes 4 mph below the speed limit, what does 12 mph mean?

+12 mph above the speed limit

If -7℃ denotes a temperature drop of 7℃, what does 5℃ mean?

+5 the temperature rise by 5C

State the numbers represented by the points A, B, and C on the number line.

A -4 B 0.5 C 2

Represent each pair of numbers on a number line and write down their relation using the “<“ sign. (a) 0, 4

Start 4 on the number line, then go down to 0, and now zero is less than 4

Represent each pair of numbers on a number line and write down their relation using the “<“ sign. (b) -2.5, 0

Start 0 on the number line then go down to 2.5 and now -2.5 is less than 0

Represent each pair of numbers on a number line and write down their relation using the “>“ sign. (a) -3, 1

Start -3 in the number line then go up to 1 and now 1 is greater than -3

Represent each pair of numbers on a number line and write down their relation using the “>“ sign. (b) -5, -1 ½ 

Start -5 in the number line then go up to -1 ½ and now -1 ½ is greater than -5

A < B > C > D < E <  F <

Simplify. |45|

45

Simplify. |-8|

8

Simplify. -|22|

-22

Simplify. -|-4|

-4

A < B < C = D > E > F <

5+\left(-2\right)

3

\left(-6\right)+4

-2

1+\left(-3\right)

-2

\left(-3\right)+\left(-2\right)

-5

0+\left(-5\right)

-5

\left(-4\right)+7

3

Evaluate. (-5) + 17

12

Evaluate. (-12) + (-25)

37

Evaluate. 24 + (-30)

-6

Evaluate. (-60) + 28

-32

-46 + (-54)

-100

-13 + 79

66

Find the additive inverse. 50

-50

Find the additive inverse. -17

17

Find the additive inverse. 123

-123

Find the additive inverse. -4,560

4,560

A 0 B 1 C -28 D 37 E -21 F 29

A -4 B -16 C 14 D -1

A 55 B 2 C 12 D 15

Find the value of each of the following:

A 16 B -11 C 0 D -10 E 0

A 210 B -340

A -4 B 6 C -8 D 3

A -9 B -20 C 35 D -24 E 14 F -17

A -7 B 20 C 6 D -18

A 15 B 27 C 14 D 6

Evaluate. |-8| - 10

-2

Evaluate. 26 - |-5|

21

Evaluate. -9 - |-2|

-7

Evaluate. -|-7| - (-3)

-4

|-2| - |9|

-7

-|-6| - |8|

-4

A + 5 > C > D >

A -72 B 20 C -42 D 51 E 19 F -12 G 13 H -19 I 144 J -64