To convert the temperature from Celsius to Fahrenheit, you can use the formula:
[tex]\[ T_{(°F)} = \frac{9}{5} \times T_{(°C)} + 32 \][/tex]
Given that [tex]\( T_{(°C)} = 18 \)[/tex]:
1. Multiply the temperature in Celsius by [tex]\(\frac{9}{5}\)[/tex]:
[tex]\[ \frac{9}{5} \times 18 = 32.4 \][/tex]
2. Add 32 to the result from step 1:
[tex]\[ 32.4 + 32 = 64.4 \][/tex]
Therefore, the temperature on Jessica's patio in Fahrenheit is [tex]\( 64.4 \)[/tex] [tex]\( °F \)[/tex].