Zero of the polynomial $p(x) = 2x + 5$ is

Verify whether the following are True or False:
$0$ and $2$ are the zeroes of $t^{2}-2t$.

Which of the following expressions are polynomials in one variable and which are not? State the reason for your answer. If the given expression is a polynomial,state whether it is a polynomial in one variable or not: $5 x^{2}-7 x+3 \sqrt{x}$

Factorise $9 x^{2}-21 x y+10 y^{2}$.

If both $x-2$ and $x-\frac{1}{2}$ are factors of $p x^{2}+5 x+r,$ show that $p=r$.

Factorise the following expression: $8x^3 + 343y^3 + 84x^2y + 294xy^2$.