What is the sum of the polynomials (4x5+3x3−x−6)+(3x3−9x−4) a/ 6x6+4x5−10x2−10 b/ 4x5+6x3−10x−10 c/ 4x5+6x3−8x+2 d/ 6x6+4x5−8x2+2 ( ! )

Don't know how to find x given these segment lengths

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 is the solution to the equation e3x=12? round your answer to the nearest hundredth