The radius of the base of a right circular cone is 6 and the radius of a parallel cross section is 4. if the distance between the base and the cross section is 8, what is the height of the cone?
a. 11
b. 13 1/3
c. 16
d. 20
e. 24

[see the figure attached]
Let's take a look at a vertical section of the cone.
By Thales' theorem, the height is hence  thus 

Answer E

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.