d gives the area between the graph of [math]y = x^2[/math] and the x-axis from a to b
Record the values of d for a = 1 as b varies from -2 to 10. Then change a to 2 and record the values of d as b varies from -2 to 10. Then change a to -1 and record the values of d as b varies from -2 to 10.