Angle alpha lies in quadrant ii, and tan alpha = -12/5. angle beta lies in quadrant iv, and cos beta = 3/5. what is the exact value of cos(alpha-beta)?

100 points pleass asap

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