Question 484167
How much longer will the ball stay in the air on the moon than the similarly-thrown baseball on Earth?

This is easy: The ball will stay in the AIR for no time at all!  There is no air on the moon!  If the time on earth air is T, then the moon ball will stay in the air 0 - T = -T longer than the earth ball.  Most stopwatches will not be able to record this extra time!

As for the rest, look up the gavity of moon, and use the usual formulas.
My wife often tells the story that when we were first married, we went to a restaurant where they supplied caryons and paper while food was cooked.  She drew flowers, I derived the formulas for a problem similar to this one!
What a romantic guy!!