Which of the following problems plagued the first attempts at showing sound. (select all that apply.)

the sound was difficult to hear
the film was difficult to see
if the projectionist was unskilled, the sound went out of sync
the film was played too fast

Social networking sites d. online forumsthe first recognizable social media site,  six  degrees, was created in 1997. it enabled users to upload a profile and make friends with other users. in 1999, the first blogging sites became popular, creating a social media sensation that's still popular today.

Iguess parallel lines