Elana's assumed that her college math class will probably have close 250 people in attendance. When she attended class she found there were actually around 278 individuals who attended. What is her percent error?

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

d. you cannot tell because there are no values shown.