Which polynomial represents the sum below? (-x^3 + 3x^2 + 3) + (3x^2 + x + 4)

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?