For each of the algebraic expressions below, select the BEST name from the list of choices. \( 4 x^{9}+5 \) is select an answer 0 \( 14 x^{4}+\frac{8}{x^{3}}-16 x^{2}+20 \) is select an answer \( \circ \) \( 4 x^{6} \) is Select an answer \( \circ \) \( 14 x^{8}+16 x^{4}-20 x^{2}+7 \) is Select an answer \( \circ \) \( 19 x^{6}-8 x^{2}+2 \) is Select an answer \( \circ \)

Reste \( 2 x^{2}-7 x-1 \) de la suma de \( x^{2}+9 x-4 \) y \( -5 x^{2}-7 x+10 \)

\( \frac{\frac{8}{5 x}-\frac{1}{x}}{\frac{4}{5}+\frac{3}{x}} \) \( \frac{\frac{8}{5 x}-\frac{1}{x}}{\frac{4}{5}+\frac{3}{x}}=\square( \) Simplify your answer. \( ) \)

Subtract. \[ \frac{3 x}{x^{2}-36}-\frac{2}{x+6} \]

Simplify the following expression. \[ \frac{x+8 y}{x-2 y} \div\left(\frac{1}{8 y}-\frac{1}{x+8 y}\right) \] \( \frac{x+8 y}{x-2 y} \div\left(\frac{1}{8 y}-\frac{1}{x+8 y}\right)=\square \) (Simplify your answer.)

Simplify. \( \frac{\frac{3}{x+5}}{x-5}-\frac{3}{x^{2}-25} \) \( \frac{\frac{3}{x+5}}{\frac{3}{x-5}-\frac{3}{x^{2}-25}}=\square \) (Use integers or fractions for any numbers in the expression.)