Answer
a) 777 ft
b) 441 ft
c) 7 seconds
d) $(29+4t)(29-4t)$
Work Step by Step
a)
$t=2$
$h=841-16t^2$
$h=841-16*2^2$
$h=841-16*4$
$h=841-64$
$h=777$
b)
$t=5$
$h=841-16t^2$
$h=841-16*5^2$
$h=841-16*25$
$h=841-400$
$h=441$
c)
$h=841-16t^2$
$0=841-16t^2$
$16t^2=841$
$16t^2/16=841/16$
$t^2=52.5625$
$\sqrt {t^2}=\sqrt {52.5625}$
$t=±7.25$
We can't have a negative time, so $t=7.25$
d)
$841-16t^2$
$29^2-(4t)^2$
$(29+4t)(29-4t)$
