A bag contains 30 marbles, 3 of which are blue, 20 are red, 5 are green, and 2 are purple. Emerson takes a marble out of the bag, records the color, and returns it to the bag. How many purple marbles should he expect after 300 trials? 20
30
50
200

but about 20. 2 x 10 since there are 30 marbles, so it makes sense to say 30 x 10 to get 300, but since you only have 2 purple, you only get 2 purple out of every 30,  

SO in conclusion, 20 purple marbles.

Explanation:

1.which of the following was the significance of the emergence of a vernacular language in medieval europe?

answer: it suggested a new interest in ordinary people

2.which of the following was a central idea in thomas aquinas's suma theologica?

answer: faith and reason don't contradict each other

3.which of the following did gothic architecture reflect about the late middle ages?

answer: the church had great wealth and authority

4.what examples of gothic architecture survive today?

answer: abbeys, cathedrals, universities

5.how did the byzantines most directly impact later civilizations?

answer: by preserving ancienct sources of knowledge and information

6.which of the following was the impact on europe of the disease described?

answer : 1/3 of the population of europe died, production declined, and cost of labor soared

7.which pair of answers best completes the top and middle arrows in the chart?

answer: the bubonic plague severly reduced the population of europe; higher demand for labor increased wages and prices leading to a market economy

8.which order of contacts most likely traces the spread of the bubonic plague to medieval europe?

answer: conquering mongol armies in asia, rats in chinese cities, fleas with travelers to the middle east and europe

9.if you wrote an essay about medieval europe, in a paragraph about which topic would you most likely refer to avignon?

answer: papal rivalry

10.how did the second great schism lead to the end of medieval europe?

answer: it caused people to question the authority of the church

11.which pull factors attracted european jews to eastern europe during the late middle ages?

answer: jews were attracted to eastern europe because they could practice judaism there without persecution

12. why did the speaker call moscow the "third rome"?

answer: moscow was the center of expanding political power

13.which statement best summarizes the effect of geography on eastern europe?

answer: different parts of the region were most influenced by cultures that had easiest access to them

14.how did eastern europe become home to so many ethnic groups?

answer: its geography and location facilitated migration

15.what are two factors that probably isolate russia from western europe?

answer: the cyrillic alphabet and olga's selection of the byzantine church

hope this : ) make brainliest

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.