Question 157284
a) You are correct. Try some values of "n" if you need a clear picture of what's going on. For instance, if 10 students go, then {{{c=2.5(10)+125=25+125=150}}} which means that the cost will be $150. 


d) The y-intercept is that initial cost. As you increment the number of students, that cost will increment by $2.50 (which is the slope). So for instance, you start at $125 (which is the rent), and one student goes, then the cost is {{{c=2.5(1)+125=2.5+125=127.5}}}. Notice how $127.5 is $2.50 more than $125