Zack orders a box of 80 sweaters manufactured from a factory. he needs to check the quality of 30% of the sweaters. select all of the equations that zack could use to find x, the number of sweaters he needs to check.

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?