3. Persamaan garis singgung parabola \( y^{2}=16 x \) yang tegak lurus dengan garis \( x+y+3=0 \) adalah

Solve: \( \frac{4}{7} x+10=8 \)

A ladder 20 feet long rests against a wall. If the base of the ladder is being pulled away from the wall at 2 feet per second, calculate the rate at which the top of the ladder is sliding down the wall when the base is 12 feet from the wall.

3. Two prime factors of 12 are A. 1 and 2 B. 2 and 6 C. 2 and 3

\( \frac { 2 } { x ^ { 3 } } + 5 = 21 \quad ( x \neq 0 ) \)

(iii) \( \left\{\begin{aligned} x_{1}-5 x_{2}-x_{3}+12 x_{4}-x_{5} & =-4 \\ -2 x_{1}+10 x_{2}+3 x_{3}-33 x_{4}+2 x_{5}+x_{6} & =4 \\ x_{3}-9 x_{4}+x_{5} & =8 \\ x_{1}-5 x_{2}+2 x_{3}-15 x_{4}+2 x_{5}+x_{6} & =14\end{aligned}\right. \)