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if
f(x)=3x+1 and f^-1= x-1/3
then the ordered pair of f -1(10) =

(10, 31)
(10, 3)
(3, 10)

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10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.