24 !
when you are multiplying opposite signed numbers, what do you count?

addtion signs

subtraction signs

Subtraction sign
because when you use a positive number multiply by a positive number you still get a PN and you can ignore the addition sign
when you multiply by a negative number you will get a Neg number

Subtraction signs because 2 negatives= a positive

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.