I dont know how to do this pls help me ​

8) x = 12

9) x = 12

Step-by-step explanation:

Use geometric mean of legs

x=12

10)

Use geometric mean of legs

x=12

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents