{"type":"rich","version":"1.0","title":"FDWK p66-67 example 35b Using a Graph to find limits-student copy","html":"<iframe src=\"https://www.desmos.com/calculator/etb7rnwsh3?embed\" width=\"500px\" height=\"500px\" style=\"border: 1px solid #ccc\" frameborder=0></iframe>","width":500,"height":500}