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TI-83 plus

Hey!

I'm trying to solve a mathematic question and either I'm doing wrong or the TI's settings are not what I like them to be.

The equation are about "statics" and it looks like this 0.79+-3.18x0.1914xsquare root of1/5+(100-97/0.1914/0.00264)^2 = [0.52, 1.06]

I'm not sure If I'm at the right place for my question, if there is any other place you recommend for me to tag this question, I will appreciate  it.

Regards Oscar