Question

11=x-(-20) i do not know how to solve these

Answer 1

$\begin{gathered} 11=x-(-20) \\ \text{solve for x:} \\ \text{ Use the law of signs}\colon \\ 11=x+20 \\ \text{subtract 20 from both sides:} \\ 11-20=x+20-20 \\ -9=x \\ x=-9 \end{gathered}$