Put them in order from least to greatest

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

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?

If chord ab is congruent to chord cd, then what must be true about ef and eg?