Let me try. (1) c-a = c + b; (2) c = 0; From (1) -a = b That means (a+b+c)/3 = (a-a+c)/3 = c/3 c = 0, average = 0 which is equal to c c = 1, average = 1/3 which is not equal to c INSUFFICIENT From (2) It tells nothing - INSUFFICIENT (1) + (2), This is exactly as in (1) when c = 0 - SUFFICIENT Answer...

Is m+z > 0?

Got this from practice test 1. Can somebody help?

Is m+z > 0?

(1) m-3z > 0
(2) 4z-m > 0

Thanks a lot.

Number property question from practice test 1

if x is positive, which of the following could be the correct ordering of 1/x, 2x and x^2?

I. x^2 < 2x < 1/x
II. x^2 < 1/x < 2x
III. 2x < x^2 < 1/x

A. None
B. I only
C. III only
D. I and II only
E. I, II and III

Can somebody help me figuring this out? Thanks.

Problem from mba.com practice test 1

Can anyone help me solve this question? I don't seem to be able to derive the answer.

In the xy-plane, at what two points does the graph of y = (x+a)(x+b) intersect the x-axis?

(1) a+b = -1
(2) The graph intersects the y-axis at (0,-6)

Many thanks.