Does this graph represent a function? why or why not?

A function can only have 1 y value for each x value. To check this on a graph you would use the vertical line test.

To pass the vertical line test, the graphed line can only touch the vertical line in one place.

The pictured graph is a function, because it would pass the vertical line test.

The answer is A.

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6