Separate the constants and variables from the following :
`-7, 7 + x , 7x + yz, sqrt(5), sqrt(xy), (3yz)/(8), 4.5y - 3x, 8 - 5, 8-5x, 8x - 5y xx p` and `3y^(2)z div 4x`

Answer

To separate the constants and variables from the given expressions, we will analyze each expression and categorize them accordingly.

### Step-by-Step Solution:

1. **Identify Constants and Variables**:
- A **constant** is a fixed value that does not change, regardless of the values of other variables.
- A **variable** is a symbol that represents an unknown value and can change.

2. **Analyze Each Expression**:
- **Expression 1**: `-7`
- This is a constant because it does not change.
- **Expression 2**: `7 + x`
- This is a variable because it changes with the value of `x`.
- **Expression 3**: `7x + yz`
- This is a variable because it changes with the values of `x`, `y`, and `z`.
- **Expression 4**: `sqrt(5)`
- This is a constant because it is a fixed numerical value.
- **Expression 5**: `sqrt(xy)`
- This is a variable because it changes with the values of `x` and `y`.
- **Expression 6**: `(3yz)/(8)`
- This is a variable because it changes with the values of `y` and `z`.
- **Expression 7**: `4.5y - 3x`
- This is a variable because it changes with the values of `y` and `x`.
- **Expression 8**: `8 - 5`
- This simplifies to `3`, which is a constant.
- **Expression 9**: `8 - 5x`
- This is a variable because it changes with the value of `x`.
- **Expression 10**: `8x - 5y * p`
- This is a variable because it changes with the values of `x`, `y`, and `p`.
- **Expression 11**: `3y^2z / 4x`
- This is a variable because it changes with the values of `y`, `z`, and `x`.

3. **Categorize the Results**:
- **Constants**:
- `-7`
- `sqrt(5)`
- `3` (from `8 - 5`)
- **Variables**:
- `7 + x`
- `7x + yz`
- `sqrt(xy)`
- `(3yz)/(8)`
- `4.5y - 3x`
- `8 - 5x`
- `8x - 5y * p`
- `3y^2z / 4x`

### Final Result:

- **Constants**: `-7`, `sqrt(5)`, `3`
- **Variables**: `7 + x`, `7x + yz`, `sqrt(xy)`, `(3yz)/(8)`, `4.5y - 3x`, `8 - 5x`, `8x - 5y * p`, `3y^2z / 4x`