Write an expression for the length of the segment

Write a polynomial that fits the description: a third-degree polynomial with leading coefficient -4

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30

The surface area of the triangular prism is .