Question

Maybeline is the teacher's assistant today and is correcting homework examples. Help her by selecting correct or incorrect after evaluating each problem.

Answer 1

Here, we need to remember the signs rules

`\begin{gathered} (+)(+\text{ )=+} \\ (+\text{ )(- )=-} \\ (-\text{ )(+ )=-} \\ (-\text{ )(- )=+} \end{gathered}`

Then

`(-4)+(-8)=-4-8=-12`

incorrect.

`(-9)-(-8)=-9+8=-1`

correct

`(+7)*(-8)=-56`

correct

`(-5)(-2.5)=12.5`

correct

`+(1)/(2)*(+6)=3`

incorrect