What is 5.73 rounded to the nearest tenth

Find the value of x for which abcd must be a parallelogram -9-6x x-30

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?

Ineed to know how to write question one in mathematical terms