Before school begins a teacher at a large high school is assigned the task of selecting students for a locker search. She decided to choose a random number from 1 to 10 and select a total of 30 based on that choice

This was correct you

Cars should be kept indoors their entire life as to not get kidnapped, get diseases, run away from owner, or get eaten by a predator

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  .