31. Quadratic equations can be solved by a process known in American English as graphing . 32. There are five calculators in the 49 / 50 series of HP graphing calculators. 33. Sharp produced its first graphing calculator, the EL-5200, in 1986. 34. Wessel's 1799 paper on a similar graphing technique did not attract attention. 35. Later models of Power Macintosh computers included newer versions of the Graphing Calculator program. 36. Is there a DC circuit inside my graphing calculator ( TI-83 )? 37. Here's my advice on graphing : sketching the first curve is difficult. 38. Hello, I need to buy a graphing calculator for a student in college. 39. What graphing calculator should I get for him? 40. My daughter's math class is working with rational functions and graphing them.