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It depends on the calculator - some have the sqrt function, with others you need to use the exponent.
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)
There are a few steps to rewriting expressions. The steps of rewriting expressions are finding the value of the letter and then using the common factor.