4. Social Security numbers are in the form ###-##-, where each symbol represents a number 0 through 9. How many Social Security numbers are possible using this format?

10^9 = 1,000,000,000 possibilities

Step-by-step explanation:

Technically, it would be 999,999,999 because nobody can be 000-00-0000, but for the sake of your assignment, it is 1 billion. Hope this helped!

(6,-6)

Step-by-step explanation:

I took the quiz and it was correct so you don't have to read all the information at the top but yes she is correct