I didn't listen to the files in your lesson, so let's list the information we have:
-song composed or performed in 1941
-song written (together with) Billy Strayhorn
-song by Duke Ellington
There is one such song, and it's "take the "A" train" - I think this is the correct answer!
<span>After a rise in settlement, the western frontier was closed by the year: 1890
During the settlement , a lot of poeple from all over the world rushed over to the western frontier to obtain cheap lands for their business.
By the year 1890, almost no land left available for the new settlers, so the government decided to close the western frontier.</span>
B. People started batering goods after coins became worthless. Hopes this helps :)
The question isn't complete and you might want to ask this in the math section.
But just to help you out, 3x means 3 times whatever "x" is.
