An animal shelter spends $1.50 per day to care for each bird and $7.50 per day to care for each cat. Matthew noticed that the shelter spent $73.50 caring for birds and cats on Wednesday. Matthew found a record showing that there were a total of 21 birds and cats on Wednesday. How many birds were at the shelter on Wednesday?

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.

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What do you mean by that?