In triangle ACD, if segment AC≅segment AD, m∠A=3x-4, m∠C=5x+1, and m∠D=7x-27, find x and the measure of each angle

Y=4x^2+x-1 solve using quadratic formula

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.