This problem demonstrates how you enter function answers into WeBWorK.

First enter the function $\log\; x$. (If you have not encountered this particular function yet, you will soon.) When entering the function, you should enter log(x), but WeBWorK will also accept log x or even logx. WeBWorK will accept this or any other function equal to log(x), e.g. log(x) + log(10^ x) - x .

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It is better to enter log(x) even though WeBWorK will also accept log x or even logx because you are less likely to make a mistake. Try entering log(2x) without the parentheses and you may be surprised at what you get. Use the Preview button to see what you get. WeBWorK will evaluate functions (such as log) before doing anything else, so log 2x means first apply log which gives log(2) and then multiply by x. Try it.

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Now enter the function $2\sqrt{ t}$ (as 2sqrt(t)). Note this is a function of $t$ and not $x$. Try entering 2sqrt(x) and see what happens.