There are a 5L bottle and a 6L bottle, how to get 3L water?

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1