Roy bicycled in 234 miles in 14 days. At this rate, how far would Roy bicycle in 42 days?

Ineed with math stuff it involves graphs

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?

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2