4. Write the degree of each of the following polynomials :
i)$$5x^3 + 4x^2 + 7x$$
ii)$$4 - y^2$$
iii)$$5t - \sqrt{7}$$
iv)$$3$$
i)$$5x^3 + 4x^2 + 7x$$ is a polynomial with highest power of variable 3.
ii)$$4 - y^2$$ is a polynomial with highest power of variable 2.
iii)$$5t - \sqrt{7}$$ is a polynomial with highest power of variable 1.
iv)$$3$$ is a polynomial with highest power of variable 0.