For this case, the first thing we must do is define a variable.
We have then:
We write the expression that models the problem:
[tex]f (m) = 40m + 35[/tex]
Then, for 10 months we have:
[tex]m = 10[/tex]
Substituting values:
[tex]f (10) = 40 (10) + 35\\f (10) = 400 + 35\\f (10) = 435[/tex]
Answer:
an expression for the total cost for m months is:
[tex]f (m) = 40m + 35[/tex]
for 10 months of service:
[tex]f (10) = 435[/tex]
