Answer:
2.The answers are "5^3 * 5 and 25^2" and "(3^2)^3 and 3^2 * 3^2 * 3^2".
3. The answer is C (3^7 : 9 = 3^7 : 3^2 = 3^(7 - 2) = 3^5).
4.5m questions
5.9m answers