1.
B.)

2.
C.) 3 x 3 x 3 x 3 x 3
3.
a.)

b.)

c.)

Here's a little explanation as to how we got those answers. A power is an exponent given to a number indicating that the base number is being multiplied by itself that many times. Here's an example:

The 4 is our base number and it is given the exponent 3, so we would read this expression like so, " Four to the third power". That third power means that 4 is being multiplied by itself 3 times. so, it would look something like this:
4 x 4 x 4
16 x 4
64

Thank you for the question! I hope this helped! Have an amazing day! :D