Need answers to 4,5,6 I have tried many times

If a || b and e || f , what if the value of y ?

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?

Math question.. plz me .. best answer all