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. 

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.