Solve the following equation by introducing the substitution \( u=\frac{3}{x-1} \). \( \left(\frac{3}{x-1}\right)^{2}+2\left(\frac{3}{x-1}\right)+1=0 \) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The solution set is \( \{ \) (Simplify your answer. Type each solution only once. Use a comma to separate answers as needed.) B. The equation has no solution.

Which of the following equations has no solution \( \begin{array}{l}x+20-5 x=7(3+x)-3 x \\ \begin{array}{l}5 x+20-7 x=7(3+x)-3 x \\ 5 x+21-x=7(3+x)-3 x \\ 5 x+20-x=7(3+x)-3 x\end{array} \\ \begin{array}{l}5\end{array}\end{array} \$ \begin{array}{l}\text { - }\end{array} \)

a) \( \log _{2} x=1-x \);

6) \( \frac{1}{x-2}=2 \)

5) \( 4(2-x)=x+3 \)

Suppose the linear regression line \( y=3.009 x \) - 77.131 predicts a pizza parlor's profits based on the number of pizzas sold. If \( x \) represents the number of pizzas sold, and \( y \) represents the pizza partor's profits in dollars, about how much can the plizza parlor expect in profits if it sells 275 pizzas? A. \( \$ 750 \) B. \( \$ 900 \) C. \( \$ 825 \) D. \( \$ 675 \)