Tom's tent rental charges a flat rate of $100 per day plus $10 for each hour the tent is used. if the number of hours is represented by "h," which algebraic expression represents the overall rate for the day using "h"?
100 + 10h
10h
100 + h
90h

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?