Answer:
yes to the first one.
yes to the second
no to the third statement
no to the fourth and
yes to the last.
there are acutually two syllables to a foot ( I think you are calling it an iamb for some reason) and there are five feet in a line. (pentameter... pentameter means five). ten syllables total. and yes, Shakespeare used it in his sonnets. that's why we learn about it in school.
Step-by-step explanation: