15. For each function equation, write "linear" or "non-linear" in the blank to indicate which kind of function it is. Note: Fill in every blank - this is not a multiple-choice question. ( 1 point total) \( \begin{array}{ll}\text { a. } y=4 x-9 \text { is a } & \text { b. } y=-8 x^{2} \text { is a } \\ \text { function. } & \text { function. } \\ \begin{array}{ll}\text { c. } y=x^{3}+x \text { is a } & \text { d. } y=6 \text { is a } \\ \text { function. } & \text { function. }\end{array}\end{array} \).

Solve the inequality. Graph the solution. \( \begin{array}{lll}\text { (7) } 5.8 y+5<3 & \text { 6. } 3 p+2 \geq-10 & \text { 7. } 2>8-\frac{4}{3} h \\ \text { 8. }-2>\frac{m}{6}-7 & \text { 9. }-1.2 b-5.3 \geq 1.9 & \text { 10. }-1.3 \geq 2.9-0.6 r\end{array} \)

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

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

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

\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}