$a)w\left(x\right)=x^5-x^4+x^3-x^2+x-1,st\left(w\right)=5$

$b)w\left(x\right)=2x^6-\frac{3}{2}{x}^5+\frac{2}{3}{x}^4-x^3-x,st\left(w\right)=6$

$c)w\left(x\right)=2x^8+x^7+3x^4-x^2+6x-2,st\left(w\right)=8$

$d)w\left(x\right)=2x^{10}-x^6+3x^2-\frac{1}{2}x+5,st\left(w\right)=10$