What is the product ? (7x^2 )(2x^3 +5)(x^2-4x-9)

Step-by-step explanation:

A prism and two nets are shown below:  Image of a right triangular prism and 2 nets. The triangle bases have base 4, height 3, and diagonal side 5. The length of the prism from the bases is 7.2. Net A has 3 rectangles in a row. The middle one has sides AC and CD. This middle one has triangle ABC on top and identical triangle below. Net B is the same except that the triangle base ABC is on top of the last rectangle which has sides AC and CD. Units are in inches. Part A: Which is the correct net for the prism? Explain your answer. (2 points) Part B: Write the measurements of Sides AB, BC, and CD of the correct net. (4 points) Part C: What is the surface area of the prism? Show your work. (4 points)

Part A: Net A, because in net B, the triangle base ABC, the side AC  is 5 in, but the correct one must be 4 in.

Part B: Look the the attach photo we know that:

Par C: surface area of the prism

(7.2*5)+(7.2*4)+(7.2*3)+2*(4*3/2)=98.4 in²