If i have 72oz of juice. and i have to fill as many 6oz glasses as possible. then drink what's left over. how much do i get to drink?

Perform the required operations on the following functions given: f(x)= 3-x; g(x)= -2x find g[f(x)]

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.

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)