When a question asks to approximate something, it means come up with an answer that is close to the exact answer. Usually an approximation is asked because a reading number off of a graph usually is not exact.When a question asks for the intercepts, it means you are to find one or more values where the curve or line crosses an axis. For example, in an x-y graph, the x-intercept is the point where the line crosses the x axis. At this point y=0, and if the graph crosses the x-axis at 2, the answer is (2,0). The y-intercept is where the curve crosses the y axis. If the y value is 3, then the y-intercept is (0,3). In the case of a line you will have one x-intercept and one y-intercept. In the case of a graph of a circle with the center at (0,0), the graph crosses each axis twice so you have two x-intercepts and two y-intercepts.