Calculate the unit rate from each of the three companies to determine which has the best work output.

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0