Which of the following correctly used the Power Rule of Exponents in the expression (10^9)7?
90^7
10^63
10^2
10^16
The correct answer is 10^63.
According to the Power Rule of Exponents, (a^m)^n = a^(m*n).
In the given expression, (10^9)^7, m = 9 and n = 7.
Therefore, (10^9)^7 = 10^(9*7) = 10^63.