Which expression is equivalent to (6 to the -1 power) to the fourth power

Which of the following expressions is equal to 2x^2+8

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?

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.