An explanation of an event that is based on repeated observations and experiments is
a
O a. problem
O b. hypothesis
O c. theory
d. variable

Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

You would do 1500/4 and the answer is 375