Posted by AMY on Friday, November 26, 2010 at 7:57pm.
Thank you for the follow-up. Sorry that I didn't check your responses.
Yes, in a function, we normally assume that
C(x)=ax+b
is equivalent to
C(t)=at+b
because t is a "dummy" variable.
However in your case, t has been stated as the variable, so it is more correct to define function as:
C(t)=20t+40
Hope you understood fully why $20 per month is associated with the variable t.
Yes. DId you see the total cost?? Was I right with the answer to that one? I think I was right.
No, I didn't.
But if total cost for t months,
C(t) = 20t + 40, then
For 0 month:
C(0) = 20(0)+40 = 40
for 4 months:
C(4) = 20(4)+40 = 120
for 5 months:
C(5) = 20(5)+40 = 140
I do not understand how you get 130 (for 5 months)!
The question has not stipulated for how many months the total cost should be calculated.
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