Write the coefficient of $x^{2}$ in the following polynomial:
$5-7 x-3 x^{2}$

Classify the following as a constant,linear,quadratic,or cubic polynomial: $t^{2}$

Write the coefficient of $x^{2}$ in the following polynomial:
$4+7x+3x^{2}$

Which of the following expressions is a polynomial? State the reason. If an expression is a polynomial,state whether it is a polynomial in one variable or not: $3x^2 + 5x - 7 + \frac{8}{x}$

Write the coefficients of $x^2$ in each of the following:
$(i)$ $\frac{\pi}{2} x^2 + x$
$(ii)$ $\sqrt{2} x - 1$

Give one example each of a binomial of degree $35$ and of a monomial of degree $100$.