So my questions are: rewrite each expression below without negative or zero exponents and numbers are 4 to the power of negative 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?

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x