Assume a is not divisible by 10. (otherwise the problem is trivial).
<span>Define R(m) to be the remainder of a^m when divided by 10. </span>
<span>R can take on one of 9 possible values, namely, 1,2,...,9. </span>
<span>Now, consider R(1),R(2),......R(10). At least 2 of them must have the sames value (by the Pigeonhole Principle), say R(i) = R(j) ( j>i ) </span>
<span>Then, a^j - a^i is divisible by 10.</span>
Divide -3
-3/-3a = 15/-3
a = -5
Answer:

Step-by-step explanation:

Apply formula:
and

We get:







Hence final answer is

Answer:
I guess it's 1/6
Step-by-step explanation:
make it braintliest please
It's zero, additive inverse means they're opposite numbera