Could you help me with this trig question

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?

Graph the following system of linear inequalities. identify at least two points in the solution: y < 5 - 2x | x + 5y > -7

Two sides of a right triangle measure 2 units and 4 units. what is the area of the square that shares a side with the third side of the triangle?