the number of students depnds upon the classroom
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The labour cost of calling out a workman = fixed [call out] cost plus an hourly rate.
A map is a good example.
A real life example for the absolute value function is a football field. Even though the center of the field is labeled zero, you wouldn't say you ran negative feet if you went backwards..
FromA function is a relation between a given set of elements called the domain and a set of elements called the co-domain. The function associates each element in the domain with exactly one element in the co-domain. The elements so related can be any kind of thing (words, objects, qualities) but are typically mathematical quantities, such as real numbers.An example of a function with domain {A,B,C} and co-domain {1,2,3} associates A with 1, B with 2, and C with 3. An example of a function with the real numbers as both its domain and co-domain is the function f(x) = 2x, which associates every real number with the real number twice as big. In this case, we can write f(5) = 10.
Domain of the logarithm function is the positive real numbers. Domain of exponential function is the real numbers.