And I'm terrible at this stuff..If someone wouldn't mind walking me through these, I'd be super grateful.

1.)

2.)

3.)

With this one, I know i need to add up the nominator and denominator by finding a common denominator for each..then to take:

[(t^2-s^2)/(s^(2)t^(2))]/[(t+s)/(st)]

But then I'm stuck.

Please and thanks!!