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Which number completes the inequality? 2/3 < _ < 7/9

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?