Answer:
Third option
Explanation:
Given the following question:
3^7 × 3^10
When multiplying exponents with a common base you simply add the exponents to simplify the expression.
In this case we have...
3^7 × 3^10
7 + 10 = 17
= 3^17
Your answer is the third option or "add the exponents."
Hope this helps.