What is the classification for this polynomial ? x^2y + 3x^3

Multiplying an even number of negative numbers gives an answer that is choose from:

Find the value of x for which abcd must be a parallelogram -9-6x x-30

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?