A child let go of a helium-filled balloon from a height of 4 feet above ground. The value of f(t) is the rate of change, in feet per second, of the balloon's height after t seconds have elapsed. The value of g() is the balloon's height in feet after seconds have elapsed. Which of the following choices represent the function g? A. 4+ft B. 4+ f(t)t C. 4 + f(u)du D. f'(u)du E. f(u)du Explain why the response you chose is the best choice: d. 14 points) The function r is the rate of change function with respect to time for a particle's displacement from its initial position when it moves in a straight line. The graph yor(t) is given below. The functions is the particle's displacement function. Its value (measured in feet) gives the particle's displacement from its initial position 1 seconds after starting At what approximate time within the first 75 seconds does s() have its smallest value? Itsee A. 1.2 sec B. 3 sec C. 5.4 sec D. 7 sec E. None of the above Explain why the response you chose is the best choice: