Question 190808
I'm assuming that the formula is {{{C(g)=3.03(g)}}} where "g" is the number of gallons of gas and C(g) is the total cost of gas.



Since the number of gallons of gas CANNOT be negative (it doesn't make sense if it could), this means that "g" must be 0 or some positive number. So this means that {{{g>=0}}}



So the domain is {{{g>=0}}} which looks like <font size=6>[</font>*[Tex \LARGE 0, \infty]<font size=6>)</font> in interval notation.



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Now let's say that you don't buy any gas, what is the total cost? The total cost would be zero dollars. So the lowest that the cost can go is $0 (it can't be negative either). 



So the cost can be $0 or some positive amount of money. This then makes {{{C(g)>=0}}} also.



So the range is {{{C(g)>=0}}} which looks like <font size=6>[</font>*[Tex \LARGE 0, \infty]<font size=6>)</font> in interval notation.