Question 147304
{{{C(t)=30t+20 }}} is the given equation.

What is the cost at 2 months? That is asking, what is C(2)?

{{{C(2) = 30*(2) + 20 }}}
{{{C(2) = 60 + 20 }}}
{{{C(2) = 80 }}} dollars

Is the client has $90, she can only get 2 months of service. Keep the other $10 for something else.