A rectangular park 40 yards wide was redesigned, and a path 1 yard wide was built around it. How long was the park before if,
after the path was built, its area became 4200 square yards?

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

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

answer: what in the world is this

step-by-step explanation: