We have the function:

A turning point happens when the function reaches a maximum or a minimum.
In that points the value of the first derivative of the function is equal to 0.
So we can find the turning points by finding the first derivative and equal to zero:
Answer
Step-by-step explanation:
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418 roses and 239 tulips. (The real answer being 657, or the third choice down)
It is t divided by r equals 2s
The answer would be standard deviation.