51/2xy^2−2 2/5xy^2−1 3/5 xy^2− 1/2xy^2 if x=3.9 and y=4 what is the simplified expression and the value

Step-by-step explanation:

Collecting terms, you get ...

... = xy²(5 1/2 -2 2/5 -1 3/5 -1/2) = xy²((5 1/2 -1/2) -(2 2/5 +1 3/5))

... = xy²(5 - 4) = xy²

Substituting the give values for the variables and doing the arithmetic, you get ...

... xy² = 3.9×4² = 3.9×16 = 62.4

216

Step-by-step explanation:

Volume of prism = BH

B -> Base area

Area of base:

b = 10 mi

h = 3.6mi

Area of the triangular base =

H = 12 mi

Volume of prism = 18 * 12 = 216  cubic mi