Identify polynomials in the following:
(i) `f(x)=4x^3-x^2-3x+7`
(ii) `g(x)=2x^3-3x^2+sqrt(x)-1`
(iii) `p(x)=2/3x^2-7/4x+9`
(iv) `q(x)=2x^2-3x+4/x+2`
(v) `h(x)=x^4-x^(2/3)+x-1`
(vi) `f(x)=2+3/x+4x`

Explanation

To identify which of the given expressions are polynomials, we need to check if each expression meets the criteria for being a polynomial. A polynomial is a mathematical expression that consists of variables raised to non-negative integer powers, with coefficients that can be any real numbers.

Let's analyze each expression step by step:

### Step 1: Analyze `f(x) = 4x^3 - x^2 - 3x + 7`
- The powers of x are 3, 2, 1, and 0 (constant term).
- All powers are non-negative integers.
- **Conclusion**: This is a polynomial.
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