Suppose that to save time and money, you recommend delivering the survey to only some of the families who have children attending the school. How would you go about sampling to get a representative sample of families? Why would you use this type of sampling and not some other type? What size sample would be adequate if you learn that there are 300 different families who have children attending this school?

Ithink the answer is bhope this !

You're asking in the ap section, so i'll give the ap calculus-style answer. alternatively, you can find the vertex of the parabola and use the "y"-coordinate as the answer.

the maximum height can occur at a critical number, that is, a number  such that  .

the derivative of  can be calculated as follows:



find a value of  that is a zero of the derivative:


this is parabola that is opening downward; we can assume there is a maximum at  .

to find that maximum, calculate  .