1/8 (-8c+16) - 1/3(6 + 3c) =

-2c

Step-by-step explanation: hope this helps! :)

-2c

Step-by-step explanation:

1/8(-8c+16)-1/3(6+3c) Simplify

1/3(6+3c) = 2+C

= (-c+2)-(c+2)

Remove parentheses  with  (-a) = a

=- -c+2-(2+c)

simplify

-2-c

=-c+2-2-c simplify

= -2c

you probably already have the answer but anyways it's b. 15.0

step-by-step explanation:

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240