Select all of the following that are quadratic functions.
x= 3x2 - 6y +5
y+3 =-2x2+5
y= 2x2 - 8 x + 6
y=-7x-4
y-3x = 4 x 3 – x2 + 9
y = 5 x(x + 9) - 8
y-2x2 = 3x - 2x2 + 4

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

300pi

step-by-step explanation:

answer: 10 meter

step-by-step explanation:

need details