Use both "The Coal Picker" and "Fueling Humanity" to answer this question.

\( \begin{array}{llcc}3.7 \ldots 2 & 75 \ldots 404 & 4.5 \ldots 1 & 1.75 \ldots \\ \text { C) } & \text { Metti una cifra al posto dei puntini in modo da ottenere un numero divisibile per } 11: \\ 1 \ldots 67 & 13 \ldots 09 & 70.9 \ldots 5 & 5.03 \ldots\end{array} \)

Subtract. \[ \frac{4 x}{x-3}-\frac{12}{x-3} \] Simplify your answer as much as possible.

\( \begin{array}{ll}\text { Ejemplo: } 9=3^{2}=\left(\frac{1}{3}\right)^{-2} \\ 16 & \text { k) } 81 \\ 25 & \text { i) } 121 \\ 49 & \text {. m) } 144 \\ 64 & \text { n) } 1 / 1.024 \\ 100 & \text { i) } 1 / 625 \\ 256 & \text { o) } 1 / 324 \\ 10.000 & \text { p) } 1 / 144 \\ \frac{1}{100} & \text { q) } 100\end{array} \)

Use turquoise (equilateral) triangles to investigate if a vertex of a polyhedron can be formed with fewer than three edges. Use a sketch to support your thinking.

Find all solutions of the equation in the interval \( [0,2 \pi) \). \[ (3 \tan x-\sqrt{3})\left(\sec x+\frac{1}{4}\right)=0 \] Write your answer in radians in terms of \( \pi \). If there is more than one solution, separate them with commas.