These are the means and standard deviations for samples of prices from two
different brands of shoes
Brand A
Mean: $50
Standard deviation: $5
Brand B
Mean: $40
Standard deviation: $8
Select the two true statements,

A. Brand A has a higher average price than brand B.

B. Brand A's prices are more spread out than brand B's prices.

C. Brand A has a lower average price than brand B.

D. Brand A's prices are less spread out than brand B's prices,

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7

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