Well, first consider how many digits there are. You have 1, 2, 3, 4, 5, 6, 7, 8, 9, and 0, depending on how you use it, that are all digits.
If you count 0 as a digit other than a place holder (0000, 0001, etc.), you would end up with ten thousand (10,000) numbers with four digits, starting with 0000, and ending with 9999. If you count 0 as nothing other than a place holder (1000, 1001, etc.), you would have nine thousand (9,000) numbers with four digits, starting with 1000.
So, depending on how you view 0, you can make up to 10,000 different numbers that contain four digits.
the answer to the first question would be 
the answer to the second question will be 
For every negative number, you multiply that number by two, and then negative one.
For example: -5*2= -10. -10*-1=10.
Answer:zero
Step-by-step explanation:
How I think about it is I call it a hoy h stands for horizontal o stands for slope of zero y stands for y only and I do the same thing but it's called a vux v stands for vertical u stands for an undefined slope and x stands for x only
