Simplify the expression:

$5m+9m+10m$5m+9m+10m

$4x-10x$4x−10x

Simplify the expression $q\times9\times p$q×9×p.

Simplify the expression $\frac{20n}{5}$20n5.

Multiply a polynomial by a monomial involving the same variable to give results up to degree three using a variety of tools