Kara is sorting buttons by length for a craft project the plot shows the length of each button if kara lines up all the 3/4 inch buttons what would be the total length

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

12 point are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr?

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?