The coefficient of $x$ in the expansion of $(x+3)^{3}$ is

Factorise the following:
$16 x^{2}+4 y^{2}+9 z^{2}-16 x y-12 y z+24 x z$

Examine whether $2x + 3$ is a factor of $2x^3 + 21x^2 + 67x + 60$ or not.

On dividing $p(x) = x^{3} + 2x^{2} - 5ax - 7$ by $(x + 1)$,the remainder is $R_{1}$ and on dividing $q(x) = x^{3} + ax^{2} - 12x + 6$ by $(x - 2)$,the remainder is $R_{2}$. If $2R_{1} + R_{2} = 6$,then find the value of $a$.

Classify the following as a constant,linear,quadratic,or cubic polynomial:
$5t - \sqrt{7}$

If $x = 2y + 6$,then what is the value of $x^3 - 8y^3 - 36xy - 216$?