(5x^2-2x) + (10x^2-3x-1) PLEASE HELP! I need the answer to this equation and the steps to get the answer as well!​

Choose all answers that apply: a) ab and a’b’ are one the same line. b) quadrilaterals abcd and a’ b’ c’ d’ have the same perimeters. c) points a and a’ have the same coordinates. d) none of the above

Which is an equation for the nth terms of the sequence 12,15,18,21

Aadc is formed by reflecting aabc across line segment ac, as shown in the figure. if the length of ac is 4 units, the area of aadc is square units.