A bicycle trail is 7 miles and 880 yards long how many total yards is the bicycle trail?

There are some things you memorize just because you keep running into them. One of them is that a mile is 5,280 feet. 5,280 divided by 3 equals 1,760 yards. A furlong is 1/8 mile, ten chains, and a chain is 66 feet. Gunter's chain was the first standardized measure for surveying. A square chain is 4,356 square feet, and ten square chains make an acre; that's why an acre is 43,560 square feet. en.wikipedia.org/wiki/Gunter's_chain

Watch a book now and then so you will know things like this.