Question

The function C(x) = 400x – 0.2x2 represents the total costs for a company to produce a product, where C is the total cost in dollars and x is the number of units sold. Which statement is true?
A. One thousand units have the minimum cost of $200,000.
B. One thousand units have the maximum cost of $200,000.
C. Two thousand units have the minimum cost of $800,000.
D. Two thousand units have the maximum cost of $800,000.

Answer 1

i'm thinking B?

Answer 2

Remember that to find maximums, we use -b/2a

Answer 3

which answer choice is correct?

Answer 4

?

Answer 5

B

Answer 6

I think its B also

Answer 7

thats what i thought, thanks :)

Answer 8

No problem :)

Answer 9

Oh, sorry, just a small correction: -b/2a is used to find the x coordinate of the vertex of the parabola, then when you plug in that value into x, you find y, in order to find the vertex (h,k).