4/5c = 8
I need help figuring out the error in the equation on the left.

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.