This graphing calculator activity engages the students in using two difference quotients and table values to approximate the slope of a function at a point. Students first study y = 2x^2 at the point (1,2). Using the two difference quotients, students find that the slope is 4. The students then explore find the slope of the same function at x = 2, 3, -1, -2, and -3. They then conjecture what the slope will be at A = -4, +4, and 0. Student then move to studying the slope along y = x^3 y =