Can you help me out plz

Perform the required operations on the following functions given: f(x)= 3-x; g(x)= -2x find g[f(x)]

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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?