While going upstream, a boat takes 6 hours to cover a certain distance. It takes only 4 hours to cover the same distance going downstream. If the speed of the boat is 8 miles/hr, find the speed of the stream.

Form a polynomial whose real zeros and degree are given. Zeros:-5,-4,3,5; degree: 4 . A polynomial with integer coefficients and a leading coefficient of 1 is \( f(x)= \). (Simplify your answer.)

6. \( f(x)=\left(x^{2}-1\right)\left(3 x^{2}-6 x+5\right)-(x+4)\left(4 x^{2}-2 x+1\right) \) 7. \( f(x)=\frac{3}{2}(\sqrt{x}-4)(4 x-5) \) 8. \( f(x)=(2 x-1)(3 x+4)(x+7) \) 9. \( f(x)=\frac{8 x^{2}-2 x+1}{x^{2}-5 x} \) 10. \( f(x)=\frac{x^{2}-4 x+3}{2 x^{2}-3 x+2} \)

3) \( \begin{array}{l}2 x+y=1 \\ 2 x-y=3\end{array} \)

Let \( f(x)=|x|, g(x)=x-3 \), and \( h(x)=x^{2} \) Write \( N(x)=x-6 \) as a composition of functions.

(2) \( x^{2}-7 x-18 \rightarrow x^{2}+b x+c \)