Discrete mathematics: show that if x and y are integers and both x*y and x + y are even, then both x and y are even.
(hint: use proof by cases and proof by contraposition)

Match each polynomial with its factorization.

Find the area of a parallelogram with base 15 yards and height 21 2/3

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