(o) Use four 9 s to express 100.

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To express 100 using four 9s, we can use mathematical operations. Here’s a step-by-step breakdown:

1. **Start with the number 9**: We have four 9s to work with.
2. **Use basic operations**: We can use addition, multiplication, and parentheses to combine the 9s.

One way to express 100 using four 9s is:

$$
99 + \frac{9}{9} = 100
$$

### Explanation of the Steps:
- **99** is formed by combining two 9s: $$9 \times 10 + 9 \times 1 = 90 + 9 = 99$$.
- **$$\frac{9}{9}$$** equals 1, which we can add to 99 to reach 100.

Thus, the expression $$99 + \frac{9}{9}$$ effectively uses four 9s to equal 100.
To express 100 using four 9s, you can use the equation $$99 + \frac{9}{9} = 100$$.

(o) Use four 9 s to express 100.

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