I. you gain 12 pounds. ii. a balloon descends 12 feet. iii. a metal spring gets 12 inches shorter. the integer -12 would best represent which of these events? a) i only b) iii only c) i and ii only d) ii and iii only

plz yuo

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.