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It depends on the calculator - some have the sqrt function, with others you need to use the exponent.
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1) Solve the equation for the desired variable. 2) Write it in function notation. For example, if y = 2x + 3, it is already solved for "y"; just rewrite it as f(x) = 2x + 3.
In Excel you can calculate the mode from the set of values by using the MODE function. If you wanted the mode from the range of cells from A2 to D50, then it would be:=MODE(A2:D50)
If your calculator has an exponentiation function, simply raise the number to the power of .5 Remember this trick: the nth root of X = X ^ (1/n)