How can you represent −2⋅9 with a model?(1 point) Responses −(9+9) negative left parenthesis 9 plus 9 right parenthesis 9+9 9 plus 9 −9+−9 negative 9 plus negative 9 −2+−2

Answer 1

To represent \(-2 \cdot 9\) using a model, you want to show the operation of multiplying -2 by 9. This can be interpreted as adding \(-9\) two times.

The correct representation from the given options is:

−(9 + 9)

This expression indicates that you are taking \(9 + 9\) (which equals 18) and applying a negative sign to it, effectively representing \(-2 \cdot 9\).

Alternatively, you could also express it as:

−9 + −9

This states that you are adding \(-9\) two times, which also results in \(-18\).

So either of these expressions (-9 + -9 or --(9 + 9)) accurately represents \(-2 \cdot 9\).