Is 7,83 rational or irrational ​

Acar travels at an average speed of 56 miles per hour. how long does it take to travel 196 miles

Describe the relationship between the angles of similar triangles and the sides of similar triangles

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?