What should you add both sides to complete the square

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.