Write the rst derivative of the given function. f(x) = x5r'2ln(x) f '(X) = (g) + 5 (%)]n(x) Ex / For which xvalues does {(X) have horizontal tangents? (Enter your answers as a commaseparated list.) Suppose that fluid is leaking from an overhead pipe and spreading in the shape of a circle on the ground. If the radius of the circle is increasing at a rate of 0.5 feet per minute, how fast is the area of the circle increasing when the radius is 7 feet? 2.199 ft2/min X