The question is below thanks

Ihave trouble finding the nth term of a linear sequence

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?

Find the distance between the pair of points a(-1,8) and b(-8,4)