Please i need it in 1 hour

QUESTION 6 For what values of it does the graph of x) = X3 + 3x2 + X + 11 have a horizontal tangent. Give an exact answer usmg radicals as needed. QUESTION 7 Water is owing into a tank. The amOunt of water in gallons held in the tank after t minutes is grven as V= 30W 2t+ 1 Find the derivative of this function and use it to find the rate at which the water is owing into the tank when t - 4 minutes. Round to the nearest whole number. Give a full sentence response using correct units. QUESTION 3 Find an equation of the tangent line to the curve at the given point. Give yaw answer In the slope-intercept form. y=29"cos(x); (0.2) QUESTION 9 W Find by implicit differentiation. o'x 2x3+3xyy2=9 QUESTION 10 Gravel is being dumped from a conveyor belt at a rate of 40 ft3rrnin. and its coarseness is such that it forms a pile in the shape ofa cone whose base diameter and height are always equal. How fast is the height ofthe plle increasrng when the pile is 6 ft high? {Round your answer to two deCimal places.) Give a full sentence response using correct units. 1 HINT: V= Enrzh i l