Jillian wanted to determine the difference of 7 and a number, n. she wrote in a table several possible expressions she could use to represent this. which is the correct expression number?

To find the number 7 and n, we first need to know what difference means. Difference means that we will be subtracting n from 7. So, now instead of using the word difference, we can just put a subtraction sign in front of n and behind 7, meaning that the expression to represent this is 7-n.