How is William's view of education different than most American students? Can you explain why William's view is so different? What results from each viewpoint? Which is the healthier viewpoint? Why?

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.

a.   mass number from atomic number

i don't understand. explain it clearly