Factor each completely.

7x²-31x-20

9k²+9k

7x²-45x-28

2b²+17b+21

5p²-p-18

28n⁴+16n³-80n²

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?

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?