Negative powers

What is the value of 5⁰?

What is the value of 3⁰?

Giving your answer as a fraction...what is the value of 3^-2?

Giving your answer as a fraction, what is the value of 5^-2?

Giving your answer as a fraction, what is the value of 7^-2?

I could write the fraction

 $\frac{1}{27}$  as 3 to the power of.....

I could write the fraction

 $\frac{1}{16}$  as 4 to the power of.....

I could write the fraction

 $\frac{1}{100}$  as 10 to the power of.....