please help! i’m constantly mixing them up, i’ll give brainliest to whoever can help. thank you so much!

Through non-collinear points there is exactly one plane.

Bring the fraction a/a-4 to a denominator of 16-a^2

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?