Order the numbers from GREATEST to LEAST: -15 |3| |-15| |-21| -1 /5
I need help so bad

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

Pls brainliest will be awarded if answer is correct