Which integer must be subtracted from -3 to give 4? Enter that integer.

الشرح

Reaching 4 from -3 calls for a rise of seven, and subtracting an amount raises a value only when that amount is itself negative, since taking away a debt has the same effect as adding its size. Choosing 7 would subtract a positive amount and drop the value to -10, moving away from the target instead of towards it.