A correlation coefficient indicates the Select one: a. extent to which demand characteristics have biased the results of the study. b. strength and direction of association between two variables. c. direction of the causal relationship between two variables. d. extent to which experimenter bias has influenced the results of the study.

12.5 feet

step-by-step explanation:

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

answer: idk

step-by-step explanation: