Numerical expressions

Which of the following is equivalent to $\left(\frac{1}{3}\right)^2$  ?

•  $\frac{1}{3}\ \cdot\ 2\ =\ \frac{2}{3}$ 

•  $\frac{1}{3}\ \cdot\ \frac{1}{3}\ =\ \frac{1}{9}$  

•  $\frac{1}{3}\ \cdot\ \frac{1}{3}\ =\ \frac{1}{6}$  

•  $\frac{1}{3}\ +\ \frac{1}{3}\ =\ \frac{2}{6}$  

• 1/r⁴

• r⁴

• r²

• 1/r²

Rewrite the power below in fraction form:
 $7^{-3}$  

•  $\frac{1}{7^3}$  

• 7

•  $\frac{7^3}{1}$  

•  $\frac{1}{7}$  

 Simplify.
 $x^{-3}y^0$  

•  $\frac{y}{x^3}$  

•  $\frac{1}{x^3}$  

•  $\frac{x}{y}$  

•  $\frac{1}{3y}$  

Simplify the expression so that it contains only positive exponents.

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Simplify each expression so that it contains only positive exponents.

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Any number to the power of ZERO equals

• 0

• 1

• 10

• no idea

• itself

• 0

• 1

• it can't exist

Any base to the power of zero equals...

• -1
• the base
• 0
• 1