Seven decreased by 13

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

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.

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?