Consider the following function of variable r, for r_0:y(r)=(r^2_ 4.00r)exp(_r). Find the value of the first derivative, dy/dr, at r=4.00. Find the value of the second derivative, d^2 y/dr^2, at r=4.00. Find the value of r where y takes its minimum value in the r_0 interval. Find the value of r where y takes its maximum value in the r_0 interval.