What is vertex of the graph of the function below y=x^2-10x+21

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?