Find the points at which the graph of the equation has a vertical or horizontal tangent line. 16x² + y² 32x + 8y + 16 = 0 (x, y) = horizontal tangents vertical tangents (x, y) = (x, y) = (x, y) = ( [ (smaller y-value) (larger y-value) (smaller x-value) (larger x-value)

A rectangular zone measuring 12 miles by 16 miles contains five buildings. What is the maximum distance separating each building from the others? (Input your answer as a number without units.)

I would like answer to number 2,3,4 please