10. what is the maximum height
the balloon will reach? the balloon
will reach it's maximum height after
how many hours?

a. the vertex is at (2, 144) so the
maximum height in feet is 2 feet, and
the time it took was 144 minutes.

b. the vertex is at (2, 144) so the
maximum height in feet is 144, and
the time it took was 2 hours

c. the maximum height is (5,0) so the
maximum height in feet is 5 and the
time it took was 5 hours

d. the maximum height is (5,0) so the
maximum height in feet was 0 and it
took 5 hours.