Please help (they need to be written in f(x) form)

Factor this polynomial completely x^2-64

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

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?