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Took a few tries, but I finally got it. Thanks!

Those are specific questions.

for example,

for number two I have, but it's wrong:
public char doubleWord(String x)
{
x="boo";
x=x+x;
Return(x);

I've tried these equations but my solutions always come out wrong. I feel like I'm just making simple mistakes, such as using void instead of double, but I just don't know.

#1: Write a public...