Think about what 9 is as a square root:

The answer which is closest to this is closest to 9.
The answer is c i hope this help you out.
(2.1 x 103) x (3.5 x 102)
216.3×357
77219.1
2to the power of 16 is is 32 because basically you are multiplying 16 x2
The rule says that:
each small angle has a small side
then the angle in front of BC is the smallest
in front of CA is the middle
in front of AB is the largest
I hope this helped and Good luck
thank you