A seismograph station recorded the arrival of the first P-wave at 7:32 p. m. from an earthquake that occurred 4000 kilometers away. What time was it at the station when the earthquake occurred? 7:20 p. m.
7:25 p. m.
7:32 p. m.
7:39 p. m.

The answer is the first option just took the test

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   

Well technically there are two correct answers b and d. but for you its probably b in general.good day sir/ma'am : ) (i know not gender)

You can look it up online and some images should pop up