Answer
$-12.1$
Work Step by Step
The addends have the same signs, so add the numbers and copy the sign of the addends to obtain:
$=-(6.2+5.9)\\\\ =-(12.1)
\\=-12.1$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.