A toy rocket is shot straight up from ground level and then falls back to earth; wind resistance is negligible. Use your calculator to determine which of the following equations has a graph whose portion above the x-axis provides the most plausible model of the path of the rocket.
(a) y = .1(x − 3)3 −.1x2 + 5
(b) y = −x4 + 16x3 − 88x2 + 192x
(c) y = −16x2 + 117x
(d) y = .16x2 − 3.2x + 16
(e) y = −(.1x − 3)6 + 600
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