PLEASE HELP what is the expression that represents the area of the blue shaded region

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

(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?

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?