Which polinomial has a leading coefficient of 4 and adegree of 3

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 to find the exponential function y=ca^x, with points (1,2) and (2,1)

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.