Which statement is true about forests? A) Forests only affect local ecosystems. B) The global ecosystem is not affected by forests. C) Forests are important in local and global economies. D) Human activities cannot destabilize organismal relationships in forests. E) Forests increase soil erosion and flooding.

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  .

(the column on the right side has numbers 1-4 as well)

from left column to the right marching definition column:
1=2
2=4
3=1
4=3