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jake is going on a 20-day vacation to the beach and to the mountains. he wants the time spent at the beach to be 2/3 the time spent in the mountains. how many days will be spend at the beach, and how many in the mountains?

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.