Question

Simplify (-9)10 × (-9)-3.....the 10 and the -3 are exponets

Answer 1

The negative exponent means that it is under one.
The division means you can subtract the lower exponent from the upper.

-9^10 1 -9^10
----- * ----- = ------- = -9^7
1 -9^3 -9^3

Answer 2

You add the exponents when multiplying with the same base. Okay?
\[\Large -9^{10 - 3}\]
\[\Large -9^{7}\]

Answer 3

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