show me how to work this problems below:

1) You would like to have $37,330 in 18 years..If the rate is 7.19%, how much do you have to invest each year?

2) You would like to have $31,204 in 10 years.If the rate is 7.65%, how much do you have to invest each month?

3) You will invest $200 per year.If the rate is 7.18%, how much will you have in 11 years?

4) An investment that will give you monthly payments for 8 years costs $132,087.If your required return is 9.84%, what is the monthly payment?