January 14th, 2010 | 
Author: If ☉ denotes a mathematical operation, does
x☉y=y☉x for all x and y?
(1) For all x and y, x☉y = 2(x² + y²).
(2) For all y, 0☉y = 2 y²
Highlight to see answer: A
Please post your explanations in the comments below!
Posted in 
Tags: 
The sum of the first 100 positive integers is 5,050. What is the sum of the first 200 positive integers?
(A) 10,100
(B) 10,200
(C) 15,050
(D) 20,050
(E) 20,100
Highlight to see answer: E
Please post your explanations in the comments below!
If p,q,r, and s are nonzero numbers, is (p – 1)(q – 2)²(r – 3)³(s – 4)4 ≧ 0?
(1) q > 2 and s > 4
(2) p > 1 and r > 3
Highlight to see answers: B
Please post your explanations in the comments below!
Four cups of milk are to be poured into a 2-cup bottle and a 4-cup bottle. If each bottle is to be filled to the same fraction of its capacity, how many cups of milk should be poured into the 4-cup bottle?
(A) 2/3
(B) 7/3
(C) 5/2
(D) 8/3
(E) 3
Highlight to see answer: D
Please post your explanations in the comments below!
