The length of a rectangle is represented by the function L(x)=5x. The width of that same rectangle is represented by the function W(x)=2x²-4x+13. Which of the following shows the area of the rectangle in terms of x?

a. (L· W)(x)=10x³-4x+13
b. (L· W)(x)=10x³-20x²+65x
c. (L+W)(x)=2x²+1x+13
d. (L+W)(x)=2x²-9x+13