Answer this please correctly and also step by step (-y+5.3)+(7.2y-9)

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

Afarm is to be built in the shape of quadrilateral abcd, as shown below. all four sides are equal. a rhombus abcd is shown with diagonal ac equal to 15.5 feet and diagonal bd equal to 13.2 feet. what is the area of the farm? pleas only pick from the 4 below 62 square feet 52.8 square feet 57.4 square feet 102.3 square feet

The answer is 7.2 how would you put this as money