A farmer plants a new type of corn and wants to quickly determine the yield, or total number of ears of corn, for the crop. He decides to take a simple random sample of the crop. He numbers each plant 1–100 and randomly picks 10 unique numbers. He then counts the number of ears of corn on these 10 plants and multiplies by 100. Which of the following statements is not true about the sample? A.) Each plant had an equal chance of being selected.
B.) The sample of 10 plants was a simple random sample.
C.) The sample of 10 plants was a census of the corn plants.
D.) Each sample of 10 had an equal chance of being selected.

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

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step-by-step explanation: