I’ve been stuck on this khan for hours already can’t seem to figure it out, it’s just adding and subtracting polynomials but it’s supposed to equal a polynomial in standard form :( please help me !!

(05.02) mr. morris is going to save money and replace his sailboat's mainsail himself. he must determine the area of the mainsail in order to buy the correct amount of material. calculate the area of the parallelogram to determine how much material should be purchased. be sure to explain how to decompose this shape into rectangles and triangles. describe their dimensions and show your work.