Question

the sum of a certain number 4​

Answer 1

The sum of a certain number and 4 is (x+4).

This can be better understood using the following steps:

• We have to write the sum of a certain number and 4. This 'certain number' can be any number from 0 to infinity, negative integers and rational numbers.
• For example, if a certain number is 5 then the expression will be (5+4) which is 9.
• Now, this 'certain number' can be better represented using a letter out of the 26 English alphabets. We can use a, b, c, d, etc.
• Hence, the expression is (x+4).