It would be 24 because 1 dozen = 12×2= 24
Perimeter is 36. This is because the radius and side lengths are the same in a regular hexagon.
Are is roughly 93.53.

This is the solution of the equation, where a=1, b=-5, c=7
So the discriminant is :
b^2-4ac=25-4*7= -3
The square root of -3 is non-real, this both solutions are non-real.