Solve a=h/2(b1 + b2) for h. is this like the one before? we are a bit confused.

Do the total opposite operations until u get to H by itself

100%sorry if i’m wronghope this good luck: )

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf