(x+2)*2

(2+2)*2=8
(8+2)*2=20
(20+2)*2=44
...

Anything that is a body of water. Like a river, lake, sea... A log floats but a pebble sinks.

It would save him 30 minutes.

Candle.

Because six has 3 letters 3 has 5, 5 has 4, 4 has 4.

Four. Ducks can't run away if they are swimming!

Because she was walking.

3, because the other 7 melted.

1. Are you sleeping?
2. Are you dead?

The kid filled a glass of water and held it over his head for 10 minutes.

Inkstand

Snow.