Three questions I didn't get, help please
1. Let f be a function of one variable defined for all reals. Which of the following conditions is not sufficient to guarantee that f has an inverse?
a.f is symmetric to the origin.
b.f is strictly increasing
c.f(x)=ax^3, a =/ 0
d.f is one-to-one
2.If f(x) is replaced by y=f(x-3), the graph is
a. moved 3 units right
b. moved upwards by 3 units
c. moved downward 3 units
d. moved 3 units to the left
3. A firm's cost function is given by the following equation:
C(q) = 10+ 10Q - 4Q^2 + Q^3
If average total cost (ATC) = C/Q and is given by the sum of (AVC) and (AFC). In other words, ATC(Q)= AVC(Q) + AFC(Q)
ATC(Q) = ?
AVC(Q) = ?
AFC(Q) = ?
I'm completely lost on these three questions, help please