Please help me! If your answer correct to me then I will brain list your answer, please.

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

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

Olive's solar powered scooter travels at a rate of 30 miles per hour. what equation can she use to calculate her distance with relation to the time she traveled? h=hours m=miles 1. h=m+30 2. m=30h 3. m=h+30 4. h=30m