The students in a college marching band are arranged in rows. The recursive rule f(n) = f(n − 1) + 8 and f(1) = 13 gives the number of students in each row, where n is the row number. All of the clarinet players are in row 1, and all of the trumpet players are in row 4. How many more trumpet players than clarinet players are there?

Which one ? is the answer and how to find this answer

The length of a rectangular piece of land is 92 yards more than three times its width. the perimeter is 760 yards. find its dimensions.

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