Senator joseph mccarthy built his power on the issue of the
a. need to weaken the role of congress.
b. extent of communist influence in the federal government.
c. decline of academic achievement among american students.
d. importance of improving race relations.

The answer to this is check all of themi hope this !

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  .