3.4X10^-5 in standard form

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Sorry guys but as you have a small brain

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.