Answer:
Wow you needed help and nobody help, thats mean.
Answer: 13
Step-by-step explanation:
If you remember the quadratic equation formula;

You can easily extract what is under the root to find the discriminant.

a = 3
b = 7
c = 3

Center:
Center is a point in space, which is at equal distance from all the others points in that space.
Answer:
45
Step-by-step explanation:
Answer:
do u need other coordinates?
if so B'(1,-1)
C'(1,4)
D'(5,6)
the formula is (-x,y)
hope it helps :)