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? = -2

Step-by-step explanation:

The division law of exponents states that when two numbers with the same base are divided, the exponents will subtract:

This means that the answer is:

Now we just need to convert the answer into the form the question needs.

The power of a power exponent law states that when an exponent is raised to an exponent, the exponent are multiplied, so:

This also means that

Since our ab is -10, we just need to divide it by the a, which is 5, to get our b, which is the ?

-10/5=-2

Therefore the ? = -2

Hope this helped!

i would say the third one.

step-by-step explanation: liner would mean in a line and the only one that doesn't look like it's even thinking about forming a line would be the third one