If you assume that a pair of rabbits produces 6 offspring and that half are male and the other half female and each pair breeds only once, how many will be produced each year for five years?

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