Calculate, correct to two decimal points: 6.1 the area of the ring in \( \mathrm{cm}^{2} \), if its inner radius \( \mathrm{r}_{1}=9 \mathrm{~mm} \) and its outer radius is \( \mathrm{I}_{2}=14 \mathrm{~mm} \). 5.2 the inner circumference of the ring, and .3 the outer circumference of the ring.

\( K \) Assignment -- Section \( K \quad \) Questor the trinomial completely. \( 8 \mathrm{t}-48+\mathrm{t}^{2} \)

FIII In the Blank Question Robots have now begun to operate in the \( \square \) sector as well as in manufacturing.

4. Identifique el método y factorice a. \( 14 a m x-4 a n x+35 b m y-10 b n y-21 a b m+6 a b n \) b. \( 3 a^{2}+2 a b-c a+3 a b+2 b^{2}-b c \)

\( \left. \begin{array} { l } { \vec { A } = - 3,4 , - 1 \quad \vec { B } = 5 , - 3,1 } \\ { \vec { A } \times \vec { B } = x \left( \begin{array} { c c } { 4 } & { - 1 } \\ { - 3 } & { 1 } \end{array} \right) - y \left( \begin{array} { c c } { - 3 } & { - 1 } \\ { 5 } & { 1 } \end{array} \right) z \left( \begin{array} { c c } { - 3 } & { 4 } \\ { 5 } & { - 3 } \end{array} \right) } \end{array} \right. \)

Factor the four-term polynomial by grouping. \[ 16 x^{3}-12 x^{2}+12 x-9 \]