Draw a diagram to represent each of these situations. Then write an addition expression that represents the final temperature. a. The temperature was $$ 80^{\circ} \mathrm{F} $$ and then fell $$ 20^{\circ} \mathrm{F} $$.

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To represent the given situation with a diagram and write an addition expression for the final temperature, follow these steps:

### Diagram
1. Draw a horizontal line to represent the temperature scale.
2. Mark the initial temperature of $$ 80^{\circ} \mathrm{F} $$ on the line.
3. Draw a downward arrow from $$ 80^{\circ} \mathrm{F} $$ to $$ 60^{\circ} \mathrm{F} $$ to represent the temperature falling by $$ 20^{\circ} \mathrm{F} $$.

```
|----------------|
|                | 80°F
|                |
|                | (↓ 20°F)
|----------------|
|                | 60°F
```

### Addition Expression
The final temperature is the initial temperature minus the amount it fell. We can represent this mathematically as:

$$ \text{Final Temperature} = \text{Initial Temperature} - \text{Amount it fell} $$

Given:
- Initial Temperature = $$ 80^{\circ} \mathrm{F} $$
- Amount it fell = $$ 20^{\circ} \mathrm{F} $$

The addition expression to represent the final temperature is:

$$ 80^{\circ} \mathrm{F} - 20^{\circ} \mathrm{F} = \text{Final Temperature} $$

However, since we are asked for an addition expression, we can also express it as:

$$ 80^{\circ} \mathrm{F} + (-20^{\circ} \mathrm{F}) = \text{Final Temperature} $$

This shows that we are adding a negative value to represent the decrease in temperature. The final temperature is $$ 60^{\circ} \mathrm{F} $$, which is the result of the addition expression:

$$ 80^{\circ} \mathrm{F} + (-20^{\circ} \mathrm{F}) = 60^{\circ} \mathrm{F} $$
The addition expression for the final temperature is $$ 80^{\circ} \mathrm{F} + (-20^{\circ} \mathrm{F}) = 60^{\circ} \mathrm{F} $$.

Draw a diagram to represent each of these situations. Then write an addition expression that represents the final temperature. a. The temperature was \( 80^{\circ} \mathrm{F} \) and then fell \( 20^{\circ} \mathrm{F} \).

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