Find the zero of the polynomial in each of the following cases

$p(x)=\frac{2}{3} x+\frac{5}{4}$

If $a+b+c=5$ and $a b+b c+c a=10,$ then prove that $a^{3}+b^{3}+c^{3}-3 a b c=-25.$

$85 \times 75=\ldots \ldots \ldots$

Factorise the following:

$1-64 a^{3}-12 a+48 a^{2}$

From the following polynomials find out which of them has $(x+1)$ as a factor

$6 x^{3}+11 x^{2}-5 x-12$

Classify the following as linear, quadratic or cubic polynomial

$4 y+11$