since it arrived at a zoo a rhinoceros's weight has increased 1 1/4 tons to 2 2/4 tons. by what percent has the rhinoceros's weight increased

What is the value of the expression below? (81^2)^1/8

In a school 2/3 of the students study a language of those who study a language 2/5 study french

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?