Answer:
6
Step-by-step explanation:
C(n) = n^2
Firstly, we need to find the derivative of this cost function: we stop at the first derivative.
dC(n)/dn = 2n
Now, we are asked to get a specific value when n = 3. To get this, what we need do is to replace n with 3 in the derivative of the cost function.
This means 2(3) = 6
