Hi, I am doing math at home, and I was confused on this problem. Thank you for helping.

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

How many triangles can be drawn with side lengths 4 centimeters, 4.5 centimeters, and 9 centimeters? explain

If you answer 2+2 you will get over 80 points