Determine all critical points the the function:

i need on this. i know the derivative is 2x - 16/ sqrt x however i'm not sure as to what else

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students