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12.6

Step-by-step explanation:

First we find the perimeter of the rectangle minus 8, because there is one side that is not showing on the outside of the shape

Perimeter of (not really) rectangle: 28

To find the circumference/perimeter of the semi circle, use the formula 2πr/2

to find r, the radius, divide 8 by 2, which is 4

Now we can substitute r for 4 giving us the expression 8π/2

divide 8 by 2: 4

now we have 4π

Round 4π to the nearest tenth, and we get 12.6

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'.