Part A: (n^2-6n)+16
[(n^2-6n+9)-9]+16
(n-3)^2+7
Part B: From the above result,
Vertex (3,7) this is the minimum point of the graph since the coefficient of a is positive
Part C: The axis of symmetry is basically the x coordinate of the vertex, so the axis of symmetry is x=3
Hope this helps!
Start with

Separate the variables:

Integrate both parts:

Which implies

Solving for y:

Since
is itself a constant, let's rename it
.
Fix the additive constant imposing the condition:

So, the solution is

~To explore/find new lands
~To discover new goods
~To trade or sell
60 x 2 = 120
Hope this helps !