Read the following description of a relationship: \[ \begin{array}{l}\text { An electronics store has } 18 \text { permanent employees who work all year, The store } \\ \text { also hires some temporary employees to work during the busy holiday shopping } \\ \text { season. } \\ \text { Let a represent the number of temporary employees and } b \text { represent the total } \\ \text { number of employees during the holiday shopping season. }\end{array} \] Use the function \( b=a+18 \) to find the value of \( b \) when \( a=7 \).

7. Show that the set F of the six complex valued functions: \( f_{1}(z)=z, f_{2}(z)=\frac{1}{1-z}, f_{3}(z)=\frac{z-1}{z} \) \( f_{4}(z)=\frac{1}{z}, f_{5}(z)=1-z, f_{6}(z)=\frac{z}{z-1} \) is a group under the usual multiplication of mappings.

Find the factar of \( x^{5}+x^{4}-13 x^{3}-13 x^{2}+36 x+36 \) ai list three factars.

76. Решите графически систему линейных уравнений: \( \begin{array}{ll}\text { а) }\left\{\begin{array}{l}x-y=1, \\ x+3 y=9 ;\end{array}\right. & \text { в) }\left\{\begin{array}{l}x+y=0, \\ -3 x+4 y=14 ;\end{array}\right. \\ \text { б) }\left\{\begin{array}{ll}x+2 y=4, \\ -2 x+5 y=10 ; & \text { г) }\left\{\begin{array}{l}3 x-2 y=6, \\ 3 x+10 y=-12\end{array}\right.\end{array}\right.\end{array} \).

Find the factar of \( x^{5}+x^{4}-13 x^{3}-13 x^{2}+36 x+36 \) of list three facturs.

\( 2 ( x + 5 ) \cdot 7 = 3 ( x - 2 ) \quad \{ x - 3 , x = 3 , x = 1 \)