Bikers were 1/2 finished with their ride at the 6-mike mark. how long was their ride ?

Which of the following is correct interpretation of the expression -4+13

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.

Iknow the square root of 2 is irrational