Answer
-1
Work Step by Step
$\frac{-3s - t - 4 }{-s - 20 - t }$
Replace s= -3, t = -6
$\frac{-3(-3) - (-6) - 4 }{-(-3) - 20 - (-6)}$
Do all the Multiplications first
$\frac{9 +6 - 4 }{3 - 20 +6}$
Addition and subtraction from left to right in numerator and denominator
$\frac{15 -4}{-17 +6}$ =$\frac{11}{-11}$
Dividing two numbers with opposite sign gives the negative result.
=-1
