Acertain arithmetic sequence has this explicit formula for the nth term: an= 11+(n-1)(4) the same sequence has this recursive formula:

Three coins are flipped. what is the probability that there will be at least two tails?

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22