I’m pretty sure the answer is D
Given:
The function is:

To find:
The turning points.
Solution:
We have,

Differentiate the given function with respect to x.



For turning point,
.




Using zero product property, we get
and 
and 
Therefore, the turning points of the given function are at
and
.
Answer:
The law of energy conservation is supported by the mathematical theory known as Mass-Energy Equivalence. This was developed by Albert Einstein.
That'd be 5/8 ths of 56 houses, or 35 houses, sold
It can't be any of those. Are you sure you didn't mean to add them instead of subtracting them?