Answer
$-8$
Work Step by Step
UK's approval rating = $21$
Iran's approval rating = $-29$
Thus, their combined approval rating is:
$=21 +(-29)
\\=-8$
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.