Please help!! I really need this fast! ;(

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?

Find the value of x. give reasons to justify your solutions! l, m ∈ kn

Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?