To apply the Product Rule of Exponents, which states that \( a^m \times a^n = a^{m+n} \), we look for expressions that involve the multiplication of terms with the same base.
Let's analyze the options:
a. \( (5^2)^9 \) - This expression involves the Power Rule (not Product Rule), as it is a power raised to a power.
b. \( 32^7 \) - This is a single term and does not involve multiplication.
c. \( 6^2 \times 7^3 \) - These bases (6 and 7) are different, so this does not apply to the Product Rule.
d. \( 10^8 \times 10^8 \) - This involves the same base, so we can apply the Product Rule here: \( 10^8 \times 10^8 = 10^{8+8} = 10^{16} \).
Thus, the expression that is correctly developed to use the Product Rule of Exponents is:
d. \( 10^8 \times 10^8 \)