Which expressions are equal to 3 nines?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air

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.

Ahyperbola centered at the origin has a vertex at (-6,0) and a focus at (10,0)