9x+ 1 =x+ 9
the solution is x=

Hi my sisters and brothers can tell me the answer because i don’t understand the question

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?

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55