If +42 represents 42m above the water surface, then what does +98−115 represent:
Given: +42 represents 42m above the water surface. Now, +98−115=−17 ⇒ −17 represents 17m below the water surface.
If +42 represents 42m above the water surface, what does each of the following represent: [4 MARKS] (i) −87+55 (ii) +98−115 (ii) +36+57−73 (iv) −42−23+39