Describing properties of a plane
in a geometry class, students are asked to describe the dimensions of a plane based on the components that create
a plane. which student's response is correct?

These are the multiples of 15 but what you are probably asking or what are the factors of 15

The principal, real, root of: 50−−√2=7.071067817.07106781−7.0710678150 is not a perfect square

  example you can find the perimeter by addig all of its respective sides as such: (12+x)+(12+x)+(7+y)+(7+y).  adding like terms will result in   2x+2y+38    if you chose  xy+7x+12y+84, you multiplied the two sides to find the area.  if you chose  x+y+19