Answer:
Up means +
down means -
As per the statement:
A roller coaster starts from a deck at an elevation of 20 feet above the ground.
A roller started Initially 20 feet from the ground .
On the first hill it climbs 78 feet
So:
20+78= 98
The coaster is 98 ft above at this point.
Then, drops 85 feet.
⇒ it went down 85 feet
so;
98-85 = 13 feet
On the second hill the coaster climbs 103 feet
Went up 103 feet
so:
13+103 = 116 feet
and then drops 110 feet.
Finally, it went down 110 feet
⇒116 - 110 = 6 feet
Therefore, 6 feet above the deck is the coaster after the second hill.
