It is an expression in the form of: 10n-1
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1 foot = 12 inches so 10n feet = 10n*12 = 120n inches.
It is an equation and the value of n is 9
10n is basically 10 times something. Example: 10n = 100/n=10
5n - 4 = 10n + 6-5n = 10n = -2
10n = 80.n = 8.