The sum of two numbers is 52, and the difference between the numbers is 2. find the numbers.

The difference between them is 2, so let the unknown numbers be x and (x+2). 

Their sum is 52, so: 
52 = x + (x+2) 
52 = x + x + 2 
50 = x + x 
50 = 2x 
25 = x 

So your unknown numbers x and (x+2) are 25 and 27.

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.