53. The vertex and the axis of symmetry of the graph of \( y=x^{2}+5 \) are \( \begin{array}{ll}\text { a. }(5,0), x=5 & \text { b. }(0,-5), x=-5 \\ \text { c. }(-5,0), x=0 & \text { d. }\end{array} \)

Give the domain of \( (x)=\frac{x+2}{2 x^{2}-5 x-18} \) using interval notation The domain of \( f(x) \) is:

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

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

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

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