HELP PLEASE! ANSWER 1 AND 2 THIS IS EXTREMELY IMPORTANT

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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?

Agallon of apple juice cost $7 a pack of eight 4.23oz box of apple juice $2.39 which is a better deal