Answer: 231.6 meters.
Step-by-step explanation:
The first step in solving this problem is to calculate the height of the oil rig. The lowest elevation is -9.6 and the top elevation is 199.2.
199.2 + 9.6 = 208.8 equals the total height of the oil rig.
If the observation deck is located at an elevation equal to the total heigh of the oil rig then the deck is at 208.8 meters.
The helipad is located 22.8 meters above the observation deck, so it is 208.8 + 22.8 = 231.6 meters.
