Answer
a) 1,456 ft
b) 816 ft
c) 10 seconds
d) $16*(10-t)(10+t)$
Work Step by Step
a)
$t=3$
$h=1600-16t^2$
$h=1600-16*3^2$
$h=1600-16*9$
$h=1600-144$
$h=1456$
b)
$t=7$
$h=1600-16t^2$
$h=1600-16*7^2$
$h=1600-16*49$
$h=1600-784$
$h=816$
c)
$h=1600-16t^2$
$0=1600-16t^2$
$16t^2=1600$
$16t^2/16=1600/16$
$t^2=100$
$\sqrt {t^2} = \sqrt {100}$
$t=±10$
We can't have a negative time, so $t=10$
d)
$1600-16t^2$
$16(100-t^2)$
$16*(10-t)(10+t)$
