Going down 250 feet will mean going down feet 250 so it will be -250. Rising 80 feet will mean going up 80 feet so it will be adding 80. Finally, descending 18 feet will mean going down 18 feet, so it will be -18. If you put them all together as one equation, you will get -250 + 80 - 18 which is -118.
Step-by-step explanation: the submarine starts at sea level, goes down 250 feet (-250). rises 80 feet (-170). descends 18 feet (-188). i don't know if this is correct or not. i haven't learned descending yet so idk- i think it's right i'm not sure. i don't know if this is right i'm so sorry.
