Which angle is congruent to angle 3 and explain why I will give a brainless for a correct answer :)

What is the equation of the following graph in vertex form? parabolic function going down from the left through the point zero comma twelve and through the point two comma zero and turning at the point four comma negative four and going up through the point six comma zero and continuing towards infinity courtesy of texas instruments a: y = (x − 4)2 − 4 b: y = (x + 4)2 − 4 c: y = (x + 2)2 + 6 d: y = (x + 2)2 + 12

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Which statements about these triangles is true