Answer:
Combined equation is 
Step-by-step explanation:
a varies directly as b and inversely as c.
This can be written as
a =
a = kb
where k is the proportionality constant
-------------------------------------(1)
Now lets find the k value bu substituting the given a, b,c values


36 = 12 k

k = 3
Thus the eq(1) becomes

Let us now find the value of a when b=7 and c = 3


a = 7
Answer:
is 0.2222....
the ( .... ) that means so on
Answer:
which question is it so I know which one to give you
1 and 2 are natural numbers
-7 belongs to set of integers
sqrt 11 is a member of the set of irrational numbers