Which of the following is not an external cost associated with hydroelectric power? options: increased turbidity caused by soil erosion flooding caused by the construction of dams temperature changes to water in rivers greenhouse gas emissions from hydroelectric plants fish kills and other deaths of aquatic organisms

C. temperature changes to water in rivers

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  .