Answer:
Three times the difference of nine and a number.
Let the unknown number/variable be = h
The difference of 9 and the number is written as

And three times this value (Three times the difference of nine and a number) is written as:

Now we have to tell the value of the expression when h = 5 :
So, putting h=5 in the expression.


= 12
So, The value of the expression when h = 5 is 4.