Question 985248
You cannot travel a negative distance. So the domain is the set of nonnegative real numbers. To be "nonnegative" basically means "not negative". The distance d is some positive number or 0. In notation form, the domain is {{{d >= 0}}} (the same as saying {{{x>=0}}}). In interval notation, the domain is <img src="http://www.sciweavers.org/tex2img.php?eq=%5B0%2C%5Cinfty%29&bc=White&fc=Black&im=jpg&fs=12&ff=arev&edit=0" align="center" border="0" alt="[0,\infty)" width="54" height="18" />


The range is the set of real numbers greater than or equal to 100. This is because $100 is the lowest amount that it costs and that cost can increase based on the distance. The range can be stated as {{{M>=100}}} (the same as saying {{{y>=100}}}). In interval notation, the range is <img src="http://www.sciweavers.org/tex2img.php?eq=%5B100%2C%5Cinfty%29&bc=White&fc=Black&im=jpg&fs=12&ff=arev&edit=0" align="center" border="0" alt="[100,\infty)" width="76" height="18" />