Answer:
a)360 blocks are placed in 
rows
b)There are 
in the top row.
Explanation:
From the question, we can deducted that there is decrease in the number of rows by 1 from 30 to some number of rows .
Let denote the number of rows as 'n'
Given:
Sn = 360
a = 30
d = -1.
To calculate Sn, we will make use of formula below;
Sn = n/2 (2a + (n - 1)d )
CHECK THE ATTACHMENT FOR DETAILED EXPLANATION
Isolationism.
The Great Depression and the fact that the US kinda promised to not do another World War like the Great War caused them to not want to join WWII at first. Then Pearl Harbor happened and they decided to be done with their policy of isolationism.
The idea of cultural diffusion is best illustrated during the Arab Spring uprising because news of rebellions in Tunisia and Egypt helped inspire Libyan rebels to launch the uprising.
It is important to note that the world is intertwined, and hence countries are affected by events which occur in other countries.
Therefore option A is correct
<h3>What was the Arab Spring Uprising?</h3>
The Arab Spring uprising was a series of anti-government protests, events, and armed rebellions that started and spread across much of the Arab world in the early 2010s having its roots in Tunisia.
The events of the Arab spring began as a response to corruption and economic stagnation which was initiated in Tunisia in North Africa and spread through most of the Arab world.
The Arab spring reminds us that nations of the world are bound together and that events which happen in one country may spread to other parts of the globe.
Learn more about Arab Spring at brainly.com/question/810543
#SPJ1
