A 20% apple juice is mixed with a 100% apple juice drink. The function f(x)= (2)(1.0)+x(0.2)/2+x models the concentration of apple juice in the drink after x gallons of the 20% drink are added to 2 gallons of pure juice. What will be the concentration of the Apple juice in the drink if 6 gallons of 20% drink are added? Give the answer as a percent but do not include the perfect sign (%).

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?