Answer:
210 feet
Step-by-step explanation:
Lets say we start at 0 feet
Now all we gotta do is treat rising as addition and dropping as subtraction
0 + 400 = 400 - 90 = 310 + 100 = 410 - 200 = 210
Therefore your final height is 210. If you need further explanation just ask
A diagram is attached if you're still confused (Sorry about the quality, lightshot does not do curves well)
