Answer:
a) 1/27
b) 16
c) 1/8
Step-by-step explanation:
a) 
One of the properties of the exponents tells us that when we have a negative exponent we can express it in terms of its positive exponent by turning it into the denominator (and changing its sign), so we would have:

And now, solving for x = 9 we have:

b) 
This is already a positive rational exponent so we are just going to substitute the value of y = 8 into the expression

c) 
Using the same property we used in a) we have:

And now, solving for z = 16 we have:

Answer:
http://www.rosenmath.com/geom/11.2.pdf
Step-by-step explanation:
Answers are all there, good luck lol
Answer:

Step By Step Explanation:
Follow PEMDAS Order Of Operations
Calculate Within Parenthesis: 

Calculate Exponents: 

Divide: 

Add

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