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3. Indistinguishable division and addition symbols on calculator

While it is not exactly good solution you could try zooming in with crtl +. I have quick look at the practise problems and did not have any trouble telling the difference between the division sign ...

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3. Troubles with a proposed solution path in a 'finding directional derivates' exercise (multivariable calculus)

Hi what you are describing is mistake on Khan Academy end. It is best you report question like this. There should have been button to do so. Can you please explain why the third term is 2h^2/4 whil...