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Three basic log rules when dealing with logarithms are multiplication inside the log can be turned into addition outside the log, division inside the log can be turned into subtraction outside the log, an exponent on everything inside a log can be moved out front as a multiplier vice versa.
Oh, dude, squaring a log is like squaring anything else - you just multiply it by itself. So, if you square the log of a number, you're just raising that number to the power of the log base twice. It's not rocket science, just some basic algebraic manipulation. Hope that clears things up for you!
In order to find the log with a power of ten, use the LOG button. For example, to find log105, type log(5). (The parenthesis after the g will appear when you press the LOG button. In order to find a log with a power other than ten, you will have to divide by the log10 of that power. For example, to find log82, type log(8)/log(2). In order to find the natural log of a number, use the LN key. For example, to find the natural log of 91, type ln(91).
You have, y = 6 + log x anti log of it, 10y = (106) x
19, of course. Review your logarithmic rules.