Which integer must be added to -13 to reach -4? Enter that integer.
Richtige Antwort
9
Erklärung
The journey from -13 up to -4 covers nine unit steps to the right, and a rightward move is added as a positive amount. Choosing -9 would carry the total nine steps further left to -22, matching the sign of the terms on the page rather than the direction of travel.