Question

a pharmacy technician receives a vial of zostavax (shingles vaccine) that must be stored at -20°c. what is the temperature in fahrenheit that the vaccine must be stored at? -4°f -13°f -22°f -31°f

Explanation:

Step1: Recall the conversion formula

The formula to convert Celsius ($C$) to Fahrenheit ($F$) is $F=\frac{9}{5}C + 32$.

Step2: Substitute the Celsius value

Given $C=- 20^{\circ}C$, substitute it into the formula: $F=\frac{9}{5}\times(-20)+32$.
First, calculate $\frac{9}{5}\times(-20)=9\times(-4)= - 36$.
Then, $F=-36 + 32$.

Step3: Calculate the Fahrenheit value

$-36+32=-4$.

Answer:

-4°F