Please help me solve this problem

Match the equivalent expressions. x - 3y + 12 12 - 3y - 2x + x + 2x 3x + 2y - 2x + y + 12 3y + 12 3x + y - 12 4y + 3y + 3x - 6y - 10 - 2 x + 3y + 2x - 3x + 7 + 5 x + 3y + 12 5 + 2y + 7x - 4x + 3y - 17

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?