Please help me with that

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?

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.