(2/3) - (7/12)
= .0834
or in fraction form: 1/12
If I understand your question correctly, you want to know how many pounds of vegetables the zoo feeds the animals a month if its a 30 day month?
In that case it would be 23 pounds times 30 days which is 690 pounds of vegetables. SO the zoo feeds the animals 690 pounds of vegetables to the animals each month.
Is that what your asking for?

=

Multiply both sides by 15
6 =

Multiply both sides by c
6c = 30 Divide both sides by 6
c = 5
Factor out 3x
Answer: 3x(x - 5)
You put the x=6
6³-4(6)²-12(6)+15=15