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 follow these steps:

### Step 1: Understand the Definitions
- **Monomial**: An algebraic expression with only one term.
- **Binomial**: An algebraic expression with exactly two terms.
- **Trinomial**: An algebraic expression with exactly three terms.

### Step 2: Analyze Each Expression
...