what does law of exponents mean?

Question

I need help on my math homework and was wondering if you could tell me what Law of exponents means/

Answer 1

1)    x^a * x^b = x^(a+b)

   2)  x^a/x^b = x^(a-b)

   3)  (x^a)^b = x^(a*b)

   4)  x^-a = 1/x^a