What is the result when 6x^2-13x+12is subtracted =3x^2+6x+7

Ten times the square of a non-zero number is eqaul to ninety times the number

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?