Answer:
Time in seconds when the ball is 4 feet above the ground is:
t= 0.6 and 2.9.
Recall that

where
is the angle between the vectors
whose magnitudes are
, respectively.
We have


Angle mes BCD = (mes Arc AE-mes ARC BD)/2
Plug: mes BCD = (64+20)/2 = 44° (Number C)
$13.73 weekly
54.92 / 4 = 13.73