Let's go through the problems you've circled from the image:

Write using an exponent:

9. $2 \cdot 2 \cdot 2 \cdot 2 \cdot 2$

• This can be written as $2^5$.

10. $7 \cdot 7 \cdot 7 \cdot 7$

• This can be written as $7^4$.

Simplify:

15. $9^2 = 81$

16. $(-4)^3 = -64$

Volume of the sugar cube:

23. The formula for the volume of a cube is $V = s^3$, where $s$ is the side length. Here, $s = 0.6$ inches.

• $V = (0.6)^3 = 0.216 \, \text{in}^3$

Let me know if you'd like further clarifications or explanations! Here's a set of related questions for practice:

1. What is $3^5$?
2. Simplify $(-5)^3$.
3. Find the volume of a cube with a side length of 1.2 inches.
4. Simplify $(-2)^4$.
5. Write $10 \cdot 10 \cdot 10 \cdot 10 \cdot 10 \cdot 10$ using exponents.

Tip: When simplifying powers, remember that a negative base raised to an odd exponent stays negative, but to an even exponent, it becomes positive!