Java programming help

is there a command for calculating the square root of a number? if so, what is it?

I'm new to the java language and so far we've only learned basic operation and if and switch. but for this program i have to write for hwk, I have to use square root.

Math.sqrt(double d) or Math.pow(double d, 0.5) (I've not checked what's faster, actually. Something I should do)
Math-class. (Static, don't initialize it)

Use the Java API next time you need to look up something.

TYVM!!!!

now i can finally finish my hwk