more physics questions!!?

[heyhay]

please answer ANY thankyou =]

30. Suppose you are served coffee at a restaurant before you are ready to drink it. in order for it to be the hottest when you are ready to drink it, you should add cream
a. when you are ready to drink the coffee
b. right away
c. at any time

37. when a gas is changed to a liquid state, the gas
a. absorbs energy
b. releases energy
c. neither

50. the phenomenon of regelation depends on the
a. open-structured nature of ice crystals
b. high specific heat of water
c. freezing point of water
d. melting point of water

[David D]

30. b, the lower the temperature the less the heat loss
37, b,
50. Not sure