CAN SOMEONE PLEASE ANSWER THIS!?!!? 10 POINTS!!?

I'm really just guessing at this, but I really want to get to level 2. =) I want to be able to vote, etc. Well . . . let's see, I would have to say that, "The loss of a particle such as a proton as an atom tries to become stable is called radioactive decay.", "If a substance is emitting radiation very slowly, what can you determine about its half-life?", (It has a long half-life.), and finally, "Half-life, is the amount of time it takes for half a radioactive substance to decay.". Number 2 and 3 seem to relate to each other, but perhaps that was the plan, hehe. I presumed that number one must relate to the other two, since they related to each other, making them all related. That's my best guess. Thank you.