elimate the parameter.
x = t +4 y = 2t^2 + 5

In what form is the following linear equation written y=9x+2

What expression is equivalent to (2x-1)(x-3)?

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?