The shapes of the horizontal cross-sections of the cylinder below are not all congruent true or false

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?

Combine like terms to make a simpler expression 3z+z

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq