A 12-year annuity pays $3,300 per month, and payments are made at the end of each month. The interest rate is 12 percent compounded monthly for the first seven years, and 10 percent compounded monthly thereafter. What is the present value of the annuity?

In a certain pentagon, the interior angles are a,b,c,d,e where a,b,c,d,e are integers strictly less than 180. ("strictly less than 180" means they are "less than and not equal to" 180.) if the median of the interior angles is 61 and there is only one mode, then what are the degree measures of all five angles?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Do,h = (7, 9) (14, 18) the scale factor is