The ratio of seventh graders to eighth graders participating in the science fair is 4: 3 . there are 18 eight graders participating in the science fair. how many 7th graders are there?

(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.