34 feet cuz 30+4=34 plus four not minus cuz he’s below sea level
If u add 125 times 8 it will equal 1000
becouse

then

you also can combine it (if this is what are you looking for..)

or any other combination like:

or:
4 and 5 are between 3 and 6
When you subtract a negative, it changes it to adding a positive.
= -2.5 - (-3.25)
= -2.5 + 3.25
= 0.75
Hope This Helped! Good Luck!