Answer:
<h2>The difference of a number and 4.</h2>
Step-by-step explanation:
The sentence that represents better the given expression is <em>"The difference of a number and 4"</em>.
Mainly because states the difference in the right order, first the unknown number, which is called "a number", and in second place the number 4, referring to the difference is the subtract of 4 units from the number, not in the opposite way.
On the other hand, "a number less than 4" specifies that the unknown number is minor than 4, which is not true. "the sum of a number and 4" is completely wrong, because there's no sum at all. "Four less a number" refers to a difference but in the opposite way 4-x.
Therefore, the right answer is
<h3>The difference of a number and 4.</h3>
