Question

Is each expression equivalent to - 2.7 + (- 3.1)A. -2.7 - 3.1B. -2.7 + (-3) + (-0.1)C. -2 + ( -0.7) + (-3) + (-0.1)D. -2 + 0.7+ ( -3.1)

Answer 1

We have the next expression

`-2.7+(-3.1)`

For A.

`\begin{gathered} -2.7+(-3.1)=-2.7-3.1 \\ -2.7-3.1=-2.7-3.1 \\ 0=0 \end{gathered}`

This expression is equivalent

For B.

`\begin{gathered} -2.7+(-3.1)=-2.7+-3+-0.1 \\ -2.7-3.1=-2.7+-3.1 \\ 0=0 \end{gathered}`

This expression is equivalent

For C.

`\begin{gathered} -2.7+(-3.1)=-2+-0.7+-3+-0.1 \\ -2.7-3.1=-2.7-3.1 \\ 0=0 \end{gathered}`

This expression is equivalent

For D,

`\begin{gathered} 2.7+(-3.1)=-2+0.7+(-3.1) \\ 2.7+-3.1=-1.3-3.1 \end{gathered}`

The expression is not equivalent