YO can someone solve this I don't get it ∴∞∧∞∴

xy=4

2x-y+2=0

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

A50% increase followed by 33 1/2% decrease

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line