Keli leamed that an air mass is a very large body of air with similar temperatures, humidity, and pressure, and that air masses are constantly in motion. She knows the air masses change, depending on the temperature and moisture content of the region where they form. She looked up
more information about what makes them move. What are the major causes for moving air masses in North America? Choose the two that apply
O A. changing humidity
B. low temperatures
C. jet stream
D. prevailing westerlies

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0

Identify the function that contains the data in the following table: x     -2         0         2         3         5     f(x)     5         3         1         2         4     possible answers: f(x) = |x| + 1 f(x) = |x - 2| f(x) = |x - 2| - 1 f(x) = |x - 2| + 1

Find the percent error of the measurement 4 cm