Ajet ski depreciates at 11% of its original value each year. if the jetske was $1000 at its time of purchase, what is the value of the jet ski after five years?

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

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?

One side of a rectangle is 7 feet shorter than seven times the other side. find the length of the shorter side if we also know that the perimeter of the rectangle is 306 feet.