In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: in a rectangular coordinate system , what is the area of a quadrilateral whose vertices have the coordinates ( 3 , - 1 ) , ( 3 , 8 ) , ( 14 , 2 ) , ( 14 , - 5 ) ? 
Options: a ) 76 , b ) 88 , c ) 100 , d ) 112 , e ) 124
[EX A]: b

[EX Q]: Problem: the length of a rectangle is halved while its width is also halved . what is the % change in area ? 
Options: a ) 25 % , b ) 30 % , c ) 50 % , d ) 65 % , e ) 75 %
[EX A]: e

[EX Q]: Problem: what is the smallest positive integer x , such that 2160 x is a perfect cube ? 
Options: a ) 100 , b ) 6 , c ) 8 , d ) 12 , e ) 18
[EX A]:
a