# Chapter 5 - Polynomials and Factoring - 5.1 Introduction to Factoring - 5.1 Exercise Set: 66

$24$

#### Work Step by Step

The given expression, $-1+20\div2^2\cdot5 ,$ simplifies to \begin{array}{l}\require{cancel} -1+20\div4\cdot5 \\\\= -1+5\cdot5 \\\\= -1+25 \\\\= 24 .\end{array}

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