An electromagnet converts electrical energy into what type of energy?

Me with this one question, and i'll upvote the brainliest answer

If you flip a coin 3 times, what is the probability of flipping heads 3 times? a. p(3 heads) = 3/8 b. p(3 heads) = 1/6 c. p(3 heads) = 1/8 d. p(3 heads) = 1/2

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.