Volume expression please explain ow you got the answer so I can complete the rest on my own :D
NO LINKS please! I will give thanks and brainily thing if you can explain how you got it

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)