Four people in a room. each shakes hands with each of the others once. how many handshakes are there?
6
10
12
16
22

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?

The volume of a cube is 8 in to the 3rd power. how long is each side?

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