a rock dropped 4 9/10 meters in the first second, and at the very next second it falls 9 4/5 meters more than the previous second. FInd the depth of the well if the rock touches the water in the well in 3 seconds.

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