If $x^{2}-10 x+21=(x+m)(x+n)$ then $m+n=\ldots \ldots \ldots$
$10$
$7$
$21$
$-10$
Write the degree of the following polynomials
$11-2 y^{2}$
State whether each of the following statements is true or false
$x^{2}-5 x+4$ is a linear polynomial.
Factorise
$\frac{x^{2}}{4}+\frac{3 x y}{5}+\frac{9 y^{2}}{25}$
Classify the following as a constant, linear,quadratic and cubic polynomials:
$2+x$
Write the coefficient of $x^{2}$ in each of the following:
$(i)$ $(x-1)(3 x-4)$
$(ii)$ $(2 x-5)\left(2 x^{2}-3 x+1\right)$
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