The length of a rectangle is 1 inch less than twice the width. the area is 21 inches what is the length?

Width = w
length = 2w-1

Area = length * width
21 = (2w-1) * w
21 = 2w² - w
2w² - w - 21 = 0
2w² + 6w - 7w - 21 = 0
2w(w+3) - 7(w+3) = 0
(2w-7)(w+3) = 0

2w-7 = 0
w = 7/2 = 3.5 inch
length = 3.5*2 - 1 = 6 inch

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.