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Evaluate a variable expression invloving exponets

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a pebble falls off a cliff from a height of 476m. The height of the pebble (in meters) t seconds after it starts falling can be approximated by 476-4.9t. About how high is the pebble 3 seconds after it starts to fall?
 May 30, 2012

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[input]f(t)=476-4.9t; f( 3 )[/input]

[input]plot( 476-4.9t, t=0..100 )[/input]
 May 30, 2012

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