Find the lcm of 15,30 and 105

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

What point is the projection of q on a) r b) s c) t

Is the square root of 4 plus the square root of 16 rational?