X2 + 4x – 9

Can someone give me step by explanation for this vertex form question?

10x − 5y + 14 = 0 whats the answer pls

Solve the equation. then check your solution 8=1.88+a

Suppose m: angle a =77 degrees what is the measure of a complement of a complement of angle a, what is a conclusion you can draw about a complement of a complement of an angle