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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.

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.

What are the triple angle formulas? is it related to double angle identities?