Help me out please I would really appreciate it.

What number must you add to complete the square x^2+12x=16

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?

How do you summarize data in a two-way frequency table?