(look at the image) can someone explain these to me ?

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

As voters exit the polls, you ask a representative random sample of voters if they voted for a proposition. if the true percentage of voters who vote for the proposition is 63%, what is the probability that, in your sample, exactly 5 do not voted for the proposition before 2 voted for the proposition? the probability is