Arock has a mass of 25kg. the acceleration due to gravity is 10 m/s and the height of the rock is 42 m. find the potential energy of the rock a. 10,500 j b. 1,050 j c. 220,500 d. 5,250

Pls super important solve the botton one

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?

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons