I don't get these, and these questions always pop up:
Here is an example:
Below are some expressions:
?ab
a + 2b
?aČ + b
The letters a and b represent lengths
? and 2 are numbers that have no dimensions
State whether each Expression is a Length, Volume, Area or None of These.
I don't get how you do this.. What does it mean they have no dimensions, and what would each expression be?
Thanks in advance