Its 2x^2-4x, to check it add it to 3x^2-2x or
2x^(2)-4x+3x^(2)-2x
3 days as she will have knitted 2/3 on the first day, 4/3 on the 2nd day and 6/3 on the 3rd day (2 scarves) Hope this helps!
It's the right angle. The circumcenter is in half of hypotenuse.
The formula of a midpoint of segment BC:

We have the points B(-2, -2) and C(7, -5). Substitute:

Answer: (2.5, -3.5)