Which number has the same value as 50 tens? 5010, 500, 50 or 5

Find the power series expantion of f(z)=log(4=3z) at the point z=-1

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have