Isaiah's vegetable garden is 15 feet long by 5 feet wide. He plans to increase the width and length of his garden and put a fence around it. He writes this expression for the total amount of fencing: (x + 15)+(x + 5)+(x + 15)+(x + 5) Write an equivalent expression that uses fewer terms.​

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?