Algebra-2

Question Analysis
This problem assesses the understanding of the multiplication and power of a power properties of exponents.

Key Concept Explanation
The multiplication property of powers with the same base states that when multiplying two powers with the same base, you add the exponents. The power of a power property states that when raising a power to another power, you multiply the exponents. For example, .

Step-by-step Solution
1. Identify the base and exponents inside the parentheses: The base is 7, and the exponents are and .
2. Apply the multiplication property: