We have 4 expressions.
We have to find which ones give -4 as a result.
[tex]-20\cdot0.2=-20\cdot\frac{2}{10}=\frac{-20}{10}\cdot2=-2\cdot2=-4[/tex][tex]-6\cdot1.5=-6\cdot\frac{3}{2}=-\frac{6\cdot3}{2}=\frac{-18}{2}=-9[/tex][tex]-\frac{2}{4}\cdot\frac{8}{2}=-\frac{8}{4}=-2[/tex][tex]4\cdot(-1+\frac{1}{4})=4\cdot(\frac{-1\cdot4+1}{4})=-4+1=-3[/tex]
