In order to learn more about the ways teenagers use their cell phones, a researcher posts a flier at a local library to recruit fifty teenagers to be surveyed.

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Mr. thompson is on a diet. he currently weighs 260 pounds. he loses 4 pounds per month. what part of the story makes the relationship not proportional?