It was always a 10 Yard penalty
Wrong. It was a 15 yard penalty till 1974 in the pros, and sometime later in college.
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9 yards
The numbers are 10 and 5
Ten dimes, fifteen nickels
Triangular numbers enumerate the items that can be arranged in a triangle. For example, ten blowling pins (10 is 4 triangled) and fifteen bowling pins (15 is 5 triangled). Applications might include counting band members in a triangle formation, or napkins in a triangle pattern at a wedding. - Bill
A decade/ten years.