Okay so the first one is right.
The second one is wrong.
the third one is right.
The forth one is wrong.
The formula of the distance between two points:
We have the points (-1, -10) and (-12, -3). Substitute:
Answer: d ≈ 13.0
It is quadratic since a quadratic function is of the form :y=ax²+bx+c ,a,b,c are constants.
Width=w
length=(40-2w)/2=20-w
A=w(40-w)
A=40w-w²
A'=40-2w=0
2w=40
w=20
20x20 is the size of the pen having the greatest area. this tells us the largest rectangle for a given perimeter is a square
the domain is your x values so it is B