(b) Solve the following systems of linear equations using Jacobi iteration method. (5 marks) \[ \begin{array}{l}\text { (8 marks) } \\ 10.27 x_{1}-1.23 x_{2}+0.67 x_{3}=4.27 \\ 2.39 x_{1}-12.65 x_{2}+1.13 x_{3}=1.26 \\ 1.79 x_{1}+3.61 x_{2}+15.11 x_{3}=1.27\end{array} \]

4. \( 4 x-2 x+2=2 x-2-2 x \)

Given the quadratic \( y=-2(x+1)^{2}-7 \) write the equation in standard form.

2. Expand and simplify \( \begin{array}{ll}\text { a. } 2(x+3) & \text { b. } \quad x\left(x^{2}-3 x\right) \\ \text { c. } \quad(x+7)(x-5) & \text { d. } \quad(x-3)^{2}\end{array} \)

Solve for the variable specified. \( A=\pi\left(k^{2}+R^{2}\right) p ; \) for \( k \)

a) \( 2 / 6=9 / x \) b) \( 1 / 3=x / 12 \) c) \( x / 10=6 / 5 \) d) \( \delta / x=2 / 15 \)