91Ó°ÊÓ

Solve each equation or inequality. $$|7+2 x|=0$$

Sohe each equation or inequality. \(|4.3 x+9.8|<0\)

Find each product. Write the answer in standard form. $$(\sqrt{6}+i)(\sqrt{6}-i)$$

Solve each equation using the quadratic formula. $$0.2 x^{2}+0.4 x-0.3=0$$

Celsius and Fahrenheit Temperatures In the met- ric system of weights and measures, temperature is measured in degrees Celsius (" \(^{\circ}\) C) instead of degrees Fahrenheit \(\left(^{\circ} \mathrm{F}\right) .\) To convert between the two systems, we use the equations $$ C=\frac{5}{9}(F-32) \quad \text { and } \quad F=\frac{9}{5} C+32 $$ In each exercise, convert to the other system. Round answers to the nearest tenth of a degree if necessary. $$40^{\circ} \mathrm{C}$$

Solve each equation. $$\sqrt[4]{x-15}=2$$

Solve each equation. $$\sqrt[4]{3 x+1}=1$$

Solve each equation using the quadratic formula. $$0.1 x^{2}-0.1 x=0.3$$

Celsius and Fahrenheit Temperatures In the met- ric system of weights and measures, temperature is measured in degrees Celsius (" \(^{\circ}\) C) instead of degrees Fahrenheit \(\left(^{\circ} \mathrm{F}\right) .\) To convert between the two systems, we use the equations $$ C=\frac{5}{9}(F-32) \quad \text { and } \quad F=\frac{9}{5} C+32 $$ In each exercise, convert to the other system. Round answers to the nearest tenth of a degree if necessary. $$200^{\circ} \mathrm{C}$$

Solve each equation. $$\sqrt[4]{x^{2}+2 x}=\sqrt[4]{3}$$