In the figure, m∠b = m∠c and ∠d is a right angle. cos b =

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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?

What are the first 4 terms in the multiplication pattern given by the formula 2×4n