28 Halla la solución de estas ecuaciones. a) \( \frac{2-x}{4}-\frac{5-x}{3}=\frac{x+3}{6} \) b) \( \frac{3 x-5}{2}=\frac{5+3 x}{4}-\frac{x}{8} \) c) \( \frac{2 x+5}{6}=\frac{4-x}{9}-\frac{2 x-5}{3} \)

5. \( z^{2}+z-12=0 \)

\begin{tabular}{l|l|}\hline 2. Explain to someone who missed class how you would write \( (3-5 i)(-2+4 i) \) in the form \( a+b i \), \\ where a and b are real numbers. \end{tabular}

\( \begin{array}{lll}\text { 5. } 8 y+5<3 & \text { 6. } 3 p+2 \geq-10 & \text { 10. }-1.3 \geq 2.9-0.6 r \\ \text { 8. }-2>\frac{m}{6}-7 & \text { 9. }-1.2 b-5.3 \geq 1.9 & \text { 10. }\end{array} \)

\( - 8.3 + x = - 12.5 \quad [ - 5.2 ] \)

What are \( a \) and \( b \) when you write \( \sqrt{-16} \) in the form \( a+b i \), where \( a \) and \( b \) are real numbers?