Element X is a radioactive isotope such that every 27 years, its mass decreases by
half. Given that the initial mass of a sample of Element X is 7900 grams, how much
of the element would remain after 12 years, to the nearest whole number?

What is the solution to the equation 9^(x+1) =27

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?

Enter the missing numbers in the boxes to complete the table of equivalent ratios.time (min) distance (km)? 36 9? 1512 ?