The Polar Bears

Question: There are these polar bears. And one day they decide to go fishing. So they go out on the ice, they cut a hole, and they sit around it. They catch 2 Karp and 7 Blue Gill. They say, that was some good fishing. Let's roll the dice. They role a 4 and a 3. How many polar bears were there?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

Question: What can be broken but never forgotten?

Question: Which thing that comes once in a year, twice in a week?

Question: You are trying to get your chicken, fox, and wheat to the barn. However, the barn is on the other side of the river. You are on a boat and can only transport one animal or wheat at a time. You must choose carefully not to leave the wrong two together, though. It's either the fox will eat the chicken or the chicken will eat the wheat. How do you take each thing across safely?

Question: If 4+5=24 7+2=21 9+6=63 6+7=?