Question 118250
h(t) = -16t^2+800
is the equation of her height at time t.
It is only true for t = 0 as she will 
not descend at the rate of 16 ft/sec^2
since she has a parachute.
Unless you know her descent rate with
the parachute I don't know what equation
you will use to indicate here height at
time "t".
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Cheers,
Stan H.