Question 3 of 24 The position of an object moving horizontally after t seconds is given by the function s = 751 -t', for t - 0, where's is measured in feet, with s = 0 corresponding to positions right of the origin. a. When is the object stationary, moving to the right, and moving to the left? b. Determine the velocity and acceleration of the object at t = 1. c. Determine the acceleration of the object when its velocity is zero d. On what intervals is the speed decreasing? a. The object is stationary att = my (Simplify your answer. Use a comma to separate answers as needed.) The object is moving to the right on . Simplify your answer. Type your answer in interval notation. Use a comma to separate answers as needed. The object is moving to the left on. Simplify your answer. Type your answer in interval notation. Use a comma to separate answers as needed.) b. The velocity of the object at t = 1 is Simplify your answer.) The acceleration of the object at t= 1 is"] (Simplify your answer.) c. The acceleration of the object when its velocity is zero is Simplify your answer.) d. The speed is decreasing on the interval(s) . Simplify your answer. Type your answer in interval notation. Use a comma to separate answers as needed.)Question 4 of 24 Consider the cost function C(x) = 0.02x+ 0.4x* + 20x + 130 a. Determine the average and marginal costs for x = 400 b. Interpret the meaning of the results from part (a) a. The average cost for x = 400 is $ (Round to the nearest cent as needed. The marginal cost for x = 400 is $ (Round to the nearest cent as needed.) b. Choose the correct interpretation of the average cost for x = 400. A. The cost of producing the 401st item is about $9,940.00. O B. The cost of producing the 401st item is about $1,701.54. C. The cost of producing 400 items is about $2, 180.33. O D. The average cost per item is about $3,380.33 when 400 items are produced. Choose the correct interpretation of the marginal cost for x = 400. O A. The cost of producing 401 items is about $501.54. O B. The cost of producing 400 items is about $2, 180,33. O C. The cost of producing the 401st item is about $9,940.00. O D. The average cost per item is about $3,380 33 when 400 items are produced