1-10 how good am i?

An air bubble of volume 20 cm³ is at the bottom of a lake 40 m deep, where the temperature is 4.0°c. the bubble rises to the surface, which is at a temperature of 20°c. take the temperature of the bubble’s air to be the same as that of the surrounding water. just as the bubble reaches the surface, what is its volume?

Which is not true about oxygen-17 and oxygen-18?

How do you tell if someone actually cares about you? and just say they do?