Answer
$t_{F}$ = $-4^{0}$F
Work Step by Step
Apply the formula to convert Ceslius to Fahrenheit:
$t_{F}$ =($t_{C}$ x$\frac{9^{0}F}{5^{0}C}$) +$32^{0}$F
We know $t_{C}$ = $-20.0^{0}$C, so :
$t_{F}$ =($-20.0^{0}$C x$\frac{9^{0}F}{5^{0}C}$) +$32^{0}$F
$t_{F}$ = $-36^{0}$F+$32^{0}$F
$t_{F}$ = $-4.0^{0}$F
$t_{F}$ = $-4^{0}$F
