Question 1038550
.A gentleman jumps out of an airplane without a parachute at 21,980 feet and lives to tell the tale. 
The function h(t)=-16tē+21,980 describes the relationship between height in feet and the time in seconds. 
How many seconds did he fall before reaching the ground?
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<pre>
The equation is 

{{{-16t^2+21980}}} = {{{0}}}.


The solution is 

t = {{{sqrt(21980/16)}}}.
</pre>