Write a unit rate for the situation

270 miles in 6 hours

What is the vertex form of f(x) = x2 + 6x + 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?

Are the corresponding angles congruent? explain why or why not.