# Chapter 9 - Basic Algebra - 9.5 Evaluating Expressions and Formulas - 9.5 Exercises - Page 661: 28

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#### 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

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