# M use this formula to find the time at which the

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M . Use this formula to find the time at which the nitrogen dioxide level was at its maximum. 66. Stabilization ratio. The stabilization ratio (births/deaths) for South and Central America can be modeled by the formula y 0.0012 x 2 0.074 x 2.69 40 30 20 10 0 Years after 1950 1 2 3 Stabilization ratio (births/deaths) Stabilization ratio for South and Central America 50 x 4 y Figure for Exercise 66 67. Suspension bridge. The cable of the suspension bridge shown in the figure hangs in the shape of a parabola with equation y 0.0375 x 2 , where x and y are in meters. What is the height of each tower above the roadway? What is the length z for the cable bracing the tower? x z y 0 5 10 10 20 15 25 30 35 40 Figure for Exercise 67 Getting More Involved 68. Exploration a) Write the equation y 3( x 2) 2 6 in the form y ax 2 bx c , and find the vertex of the parabola using the formula x 2 a b . dug22241_ch10a.qxd 11/10/2004 18:31 Page 648
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