For numbers 6 to 10, encircle the letter of the correct natation for the given number.

6. 32 a.2³ b.2⁵ c.2¹⁰ d.3²
7. 36 a.2⁶ b.6² c.6³ d.2¹⁸
8. 49 a.2⁷ b.1⁴⁹ c.7² d.49²
9. 64 a.2³² b.62² c.2⁶ d.8³
10. 81 a.9⁹ b.27³ c.3⁴ d.9²​