What is five kilometers to the nearest tenth of a mile?

Taking algebra two apex courses and need with these questions

How do you determine if an ordered pair is a solution to a given equation?

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?