Expand the following and simplify: $3u\left(3u-3v\right)$3u(3u−3v)

Expand the following: $\left(4x+0.9\right)^2$(4x+0.9)2

Expand the following:

$\frac{1}{m}\left(tm^3+5m\right)$1m(tm3+5m)

Expand the following: $\left(y+\frac{1}{y}\right)^2$(y+1y)2