The answer is A because 25 percent is equivalent to .25
All three triangles are congruent by SAS
3x^2 - 7x + 12 = 0 ....subtract 12 from both sides
3x^2 - 7x = -12 ....divide both sides by 3 to get x^2 by itself
x^2 - 7/3x = -4
His work is not accurate because he divided the second term by 4 instead of 3.
Its the first one because -3(-2)=6, 1(-2)=-2, 2(-2)=4 are all correct