Facing competition from iPhones and other devices that have caught on with students, Texas Instruments Inc. is trying to inject some new life into its popular line of graphing calculators, reports the Wall Street Journal. But its latest entry, the $135 TI-Nspire, has gotten off to a slow start since hitting stores last year. One of the company's biggest challenges is convincing users the revamped model is better than existing ones, which generally cost about $100. Some math teachers say the Nspire, which has more computer-like features, is unnecessarily complex. And calculator enthusiasts complain the new model limits what kind...

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