## Algebra 1

$-2.1-[2.3-(3.5-(-1.9))]\longrightarrow$ in the innermost parentheses, change subtraction to addition, and reverse the sign of the following term =$-2.1-[2.3-(3.5+1.9)]\longrightarrow$ add in innermost parentheses =$-2.1-[2.3-5.4]\longrightarrow$ subtract within brackets =$-2.1-[-3.1]\longrightarrow$ change subtraction to addition, and reverse the sign of the following term =$-2.1+3.1\longrightarrow$ add =$1$