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If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

One hectometer is a) 1/1000 of a meter. b) 1/100 of a meter. c) 10 meters. d) 100 meters. e) 1000 meters.

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.