Which of the following is true about groundwater? a) groundwater is the biggest fresh water reservoir on earth. b) when the rate of pumping is greater than the rate of infiltration, shallower wells may run dry. c) there is more water stored in groundwater than in all earth’s lakes and rivers combined. d) all of the above

Answer dot(3) is most used;

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  .

answer:

ok sir

explanation: