Write the following cubes in expanded form

$(7 x-4 y)^{3}$

Classify the following as a constant, linear,quadratic and cubic polynomials:

$t^{2}$

The degree of polynomial $5 x^{2}-7 x-11$ is..........

Factorise the following:

$9 x^{2}-12 x+3$

In the polynomial $5 x^{3}-3 x^{2}+11 x-4,$ the coefficient of $x^{2}$ is......

Find the value of

$x^{3}+y^{3}-12 x y+64,$ when $x+y=-4$