Given:
The cost function of a yearly subscription is
[tex]C=45+3.75M[/tex]
where, M is the number of magazines.
To find:
The appropriate domain.
Solution:
We have,
[tex]C=45+3.75M[/tex]
Domain is the set of input values and here input variable is M, which is number of magazines.
Linear function is defined for all input values. But the number of magazines can not be negative or decimal or fractional values. So, the possible value of M is always a whole number.
Therefore, the domain for the function is the set of whole numbers, i.e., {0, 1, 2, 3, ....}.
