Can someone help me with simultaneous equations

Don't know how to find x given these segment lengths

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?

In a timed typing test lara typed 63 words per minute. estimate the number of words she should be able to type in half in hour show your work