## Precalculus (6th Edition)

$-128.92°F$
The formula to convert from C to F is: $F = \frac{9}{5}C + 32$ Lets replace C by -89.4: $F = \frac{9}{5} \times(-89.4) + 32 = 160.92 + 32 = -128.92$ $-128.92°F$