Find the value of y when given the value of x: y=2x-4 when x=7

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?

Hi, can anyone show me how to do this problem? 100 points for this. in advance

What is the value of x in the equation 1.5x+4-3=4.5(x-2)?