What is the volume of a cylinder ring if we know the diameter of the revolving circle is 4 ft. and the length of the center line is 65 ft.

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?

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Which statement justifies why angle ebc measures 90?