Question 128
The height of a place A is 1800 m above sea level. Another place B is 700 m below sea level. What is the difference between the levels of these two places?
Question 61.
If we denote the height of a place above sea level by a positive integer and depth below the sea level by a negative integer, then write the following using integers with the appropirate sign:
(a) 200 m above sea level (b)100 m above sea level
(c)10 m above sea level (d) Sea level