15 and 25 least common multiple im confused on this 3/7+6/11= 1/3 + 3/4= 4/5 + 3/7= 7/12-1/8= 9/10 -2/3= i can get the answers i just need some one to do an addtion one and subtracting one and show me how

(05.02)a farmer has decided to divide his land area in half in order to plant soy and corn. calculate the area of the entire area so he knows how much soil is needed. a parallelogram with a height of 6 yards and side length 9 yards. the height forms a triangle with the slanted side of the rhombus with a base of 2.5 yards. rhombus is split into a soy half and a corn half. each bag of soil covers 40 square yards. how many bags should the farmer purchase?