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5/6

Step-by-step explanation:

Suppose x = 0.83 (3 repeating).

Multiply both sides by 10:

10x = 8.3 (repeating 3)

Now, multiply both sides by 10 again:

100x = 83.3 (repeating 3)

So, we have:

100x = 83.3 (repeating 3)

10x = 8.3 (repeating 3)

We see that if we subtract these two equations, the repeating 3s cancel out, and we're left with:

100x - 10x = 83 - 8

90x = 75

x = 75/90 = 5/6

Thus, the answer is 5/6.

Hope this helps!

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13

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'.