The number of school buses needed to transport students on a field trip is given by the function f(x) = x+3/ 30 what is the domain of this function

Question

I need help with my EOC review 

Answer 1

x must be greater than or equal to -3, IF YOU INTENDED FOR THE NUMERATOR TO BE (x+3)--because f(x) cannot be negative.  

 

Of course, we don't know what x means, so there might be other considerations, including provision for f(x) required to be an integer.