$144 c{m}^2$

$180 c{m}^2$

$360 c{m}^2$

$504 c{m}^2$

$P=322 m, A=5751.25 m^2$

$P=310 m, A=5751.25 m^2$

$P=322 m, A=5381.25 m^2$

$P=310 m, A=5381.25 m^2$

$x=-3$

$x=-8$

$x=\pm 7$

$x=\pm 5$

$13\% profit$

$30\% profit$

$3\% profit$

$33\% profit$

$x=\pm 1$

$x=\pm 2$

$x=0$

$x=\pm \sqrt{2}$

$28.26 c{m}^2$

$3.88 c{m}^2$

$1.94 c{m}^2$

$36 c{m}^2$

$$\begin{gathered} \left(6 \\ 4\right) \end{gathered}$$

$$\begin{gathered} \left(7 \\ 3\right) \end{gathered}$$

$$\begin{gathered} \left(-2 \\ -3\right) \end{gathered}$$

$$\begin{gathered} \left(1 \\ -1\right) \end{gathered}$$

$x^3+5x^2-16x-80$

$x^3+20x^2-16x-80$

$x^3+16x^2-20x-80$

$x^3-5x^2+16x+80$

$\frac{x+y}{x+4}$

$\frac{x-y}{x-4}$

$\frac{x+y}{x-4}$

$\frac{x-y}{x+4}$

$-4, -3, -2, -1, 0, 1, 2, 3$

$-4, -3, -2, -1, 0, 1, 2$

$-3, -2, -1, 0, 1, 2, 3$

$-3, -2, -1, 0, 1, 2$

$35w^{\frac{7}{2}}{x}^{\frac{7}{3}}{y}^5$

$12w^{\frac{7}{2}}{x}^{\frac{7}{3}}{y}^5$

$2w^{\frac{5}{2}}{x}^{\frac{5}{3}}{y}^5$

$35w^{\frac{7}{3}}{x}^{\frac{7}{2}}{y}^4$

$t=\frac{y+10}{2}$

$t=\frac{y-10}{2}$

$t=\frac{10-y}{2}$

$t=\frac{2+y}{10}$

$s_n=\frac{5}{n^2}$

$S_n=\frac{n}{n^3}$

$S_n=\frac{n}{1+n^3}$

$S_n=\frac{n}{n^3-1}$

80

560

35

45

$1.6\times {10}^{-5}$

$1.6\times {10}^{-4}$

$16\times {10}^{-5}$

$16\times {10}^{-4}$