Respuesta :

1)

a. Answer is -2

Proof:-

8+x= -10

→ x= -10+8

→ x = -2

b. Answer is 8

Proof:-

-12 + x = -4

x = -4+12

x = 8

c. Answer is -30

Proof:-

24 + x = -6

x = -6 - 24

x = -30

d. Answer is 17

Proof:-

-9 + x = 8

x = 8+9

x = 17

e. Answer is -21

Proof:-

21 + x = 0

x = -21

2)

a. Answer is 13

Proof:-

9 - x = -4

- x = - 4 - 9

- x = - 13

x = 13

b. Answer is -19

Proof:-

-12 - x = 7

-x = 7+12

-x = 19

x = -19

c. Answer is -4

Proof:-

11 - x = 15

-x = 15-11

-x = 4

x = -4

d. Answer is 2

Proof:-

-6 - x = -8

-x = -8+6

-x = -2

x = 2

e. Answer is 35

Proof:-

25 - x = -10

-x = -10-25

-x = -35

x = 35

3)

a. Answer is 7

Proof:-

5 x 7 = 35

b. Answer is 9

Proof:-

6 x 9 = 54

c. Answer is -3

Proof:-

-9 x -3 = 27

d. Answer is 7

Proof:-

-7 x 7 = -49

e. Answer is -7

Proof:-

2 x -7 = -14

4)

a.

8 x (-3) = 24

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