Determine the temperature in Fahreinheit

\(\displaystyle{F}=\frac{{9}}{{5}}{C}+{32}\) Write the formula

\(\displaystyle{F}=\frac{{9}}{{5}}{\left(-{89.4}\right)}+{32}\) Substitute the value of C

\(F=-160.92+32\) Multiply the values

\(F=-128.92\) Simplify

\(F \sim -128.9\) Round off