Classify into monomials, binomials and trinomials. (i) `4y-7z` (ii) `y^2` (iii) `x+y-xy` (iv) `100`

Explanation

To classify the given expressions into monomials, binomials, and trinomials, we will analyze each expression based on the number of terms it contains.

### Step-by-Step Solution:

1. **Identify the first expression: `4y - 7z`**
- This expression contains two terms: `4y` and `-7z`.
- Since it has two terms, it is classified as a **binomial**.

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