Math math math math 4 you (it's easy)

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

Find the amplitude of a sinusoidal function that models this temperature variation