1.
u-w=49x⁵-37x⁴-43x+5-(12x⁵-29x⁴-19x²-18x)
u-w=49x⁵-37x⁴-43x+5-12x⁵+29x⁴+19x²+18x
u-w=37x⁵-8x⁴+19x²-25x+5
St(u)=5
St(w)=5
St(u-w)=5
2.
h(x)=3f(x)-4g(x)
f(x)=3x⁴+⅔x³-5x²+1⅓
g(x)=-2x⁵-x⁴+½x³-2x²+1¼
h(x)=3(3x⁴+⅔x³-5x²+1⅓)-4(-2x⁵-x⁴+½x³-2x²+1¼)
h(x)=9x⁴+2x³-15x²+4+8x⁵+4x⁴-2x³+8x²-5
h(x)=8x⁵+13x⁴-7x²-1
h(-1)=-8+13-7-1
h(-1)=-3
3.
w(x)=2u(x)-4v(x)
u(x)=2x⁴+x²-1
v(x)=x⁴-2x²+2
w(x)=2(2x⁴+x²-1)-4(x⁴-2x²+2)
w(x)=4x⁴+2x²-2-4x⁴+8x²-8
w(x)=10x²-10