Please help me subject math

i'll brainliest if you answer correctly

Step-by-step explanation:

1)

8 + (-4)

= 8 - 4

= 4

2)

-2/3 + (-5/6)

= -2/3 - 5/6

= -4-5/6

= -9/6

= -3/2

3)

(-9) (-12)

= 9 × 12

= 108

4)

-5 + (-5)

= -5 - 5

= - 10

5)

(8) (-4)

= 8 × -4

= -32

6)

(1/2) (2/5)

= 1/2 × 2/5

= 1/5

7)

12 + 14

= 26

8)

(13) (7)

= 13 × 7

= 91

9)

(-3/8) (3/4)

= -3/8 × 3/4

= -9/32

the answer is c. 23/3

d, x=8

step-by-step explanation:

simplifying

4x + -5 = 2x + 11

reorder the terms:

-5 + 4x = 2x + 11

reorder the terms:

-5 + 4x = 11 + 2x

solving

-5 + 4x = 11 + 2x

solving for variable 'x'.

move all terms containing x to the left, all other terms to the right.

add '-2x' to each side of the equation.

-5 + 4x + -2x = 11 + 2x + -2x

combine like terms: 4x + -2x = 2x

-5 + 2x = 11 + 2x + -2x

combine like terms: 2x + -2x = 0

-5 + 2x = 11 + 0

-5 + 2x = 11

add '5' to each side of the equation.

-5 + 5 + 2x = 11 + 5

combine like terms: -5 + 5 = 0

0 + 2x = 11 + 5

2x = 11 + 5

combine like terms: 11 + 5 = 16

2x = 16

divide each side by '2'.