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9) A ball is thrown vertically upward from the top of a building 96 feet tall with an initial velocity of 80 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s(t) = 96+80t -1612. After how many seconds does the ball strike the ground? 10) Find the vertical and horizontal asymptotes, if any, of the rational function R(x) = 6r- + r+ 12 3.r2 - 5:r - 2 11) David has available 400 yards of fencing and wishes to enclose a rectangular area. Express the area A of the rectangle a a function of the width w of the rectangle. For what value of w is the area largest? What is the maximum area? Sketch the graph of A(w)