College algebra

Question

A certain electronics manufacturer found that the average cost  to produce x DVD/Blu- ray players can be found using the equation . What is the minimum average cost per machine and how many DVD/Blu-ray players should be built in order to acheive that minimum?The

The minimum average cost is

The number of DVD/Blu-ray players that should be build to acheive the minimum is 

Answer both to the nearest whole number.

Answer 1

C(x)= 0.04x^2 - 5x + 600 is a positive parabola (since 0.04>0) so it has a min value.

What is the formula to find the x-value where the min/max of a parabola occurs?

What is that x-value for your function C?

What is the C value for that special x-value?