The question is in the picture. I'll give brainiest and 5 *s and thanks! Please answer quick

The answer is B) B and C only.

Step-by-step explanation:

Direct proportion is where X and Y's relation between quantities is constant.

9514 1404 393

  B)  B and C only

Step-by-step explanation:

A direct proportion will always have y=0 when x=0. This eliminates tables A and D. When the x-differences are constant, so will be the y-differences. This describes both tables B and C.

 Tables B and C only show Direct Proportion.

(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