What fractional amount of the earth’s surface is covered by oceans or glaciers if 2/3 is covered by oceans and 1/10 by glaciers?

don’t know where to start? but how?

It’s C because it works and it should help you get it right

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.