The problem is asking for where the output (y value) of one function, f(x), matches the output of another function, g(x), otherwise called an intersection. You can see that the two lines intersect at 0 on the x axis in the graph, therefore f(0)=g(0) meaning the outputs of f(x) are the same as g(x) at x value 0.
121 rounded to the nearest 100 is 100 because 121 is closer to 100 than 200. 252 rounded to the nearest hundred is 300 because 252 is closer to 300 than 100.
