You have a lens whose focal length is $-6\mathrm{.}71$ cm $.$ You place an object on the axis of the lens at a distance of $12\mathrm{.}9$ cm from it$.$

How far $s^{\text{'}}($in centimeters$)$ is the object's image from the lens?

Enter your answer as a positive quantity.

If it can be determined, is the image real or virtual?

$$ cannot be determined

real

virtual

If it can be determined, is the image upright or inverted with respect to the object?

upright

cannot be determined

inverted