## Loser66 one year ago @freckles Please, what is it and how to solve? http://gyazo.com/459407d28e6cdad59dc032766fc7ac02

1. Loser66

I have another one and not sure what they want me to do Appreciate any tips. http://gyazo.com/7e43f8ee6a66384dfb6b5689e3bc447d

2. myininaya

I don't get the first one seems like things are missing

3. Empty

I don't understand what the first question is even asking to be honest, it seems incomplete.

4. Empty

The second question: The first statement only implies that if we plug in $$a\ne0$$ that $$b \ne 0$$ which doesn't specify anything on its own, we still have any other combination we can pick for a and b. The second statement is identical to the question's statement, just add 9b to both sides and multiply both sides by 5. So it doesn't give us any new information either.

5. Loser66

6. Empty

7. Loser66

This is the first time I see this kind of question. I don't know what the goal of the problem. What am I supposed to do?

8. myininaya

could you fix up number 6 a little

9. Empty

I interpreted this as asking if we had enough information to solve uniquely for the value of a and b.

10. Loser66

11. Loser66

@myininaya what do you mean by "fix up"? How can I fix it?

12. myininaya

I mean to make it readable

13. myininaya

it makes no sense as is

14. Loser66

This is the site where I am working http://mba.graduateshotline.com/gmat_quantitative_test.html#.VZSVSEZRIoo

15. Empty

Well the question is literally asking if that statement is true which is basically identical to my statement that a=b or a=/=b. We can't determine the truth value of it based on the information given so yes, the last answer is correct.

16. myininaya

yep they don't make it make anymore sense

17. myininaya

I'm gonna take a guess: $<x>=x+\frac{x}{2}-2$

18. myininaya

$<w>=10$

19. myininaya

$10=w+\frac{w}{2}-2$

20. Empty

Yeah it's nonsense, they don't even say what w is supposed to represent lol

21. myininaya

$20=2w+w-4 \\ 20=3w-4 \\ 24=3w \\ w=8$ but I didn't interpret what they so clearly meant :p

22. Loser66

OMG!! I will fail for sure. Thanks for the help @Empty @myininaya

23. myininaya

Well you won't fail if they can make the questions clear

24. myininaya

It really is not clear what they are saying there

25. Loser66

Thank you so much. Anyway, it is just 1 out of 10. hehehe... no failure.!!

26. Empty

Yeah failing this is equivalent to failing to answer someone when they ask you what's the length of potato? You shouldn't feel too bad about some of these questions lol.

27. myininaya

I would be afraid to click anything on that site they might somehow try to hack my person information that is how screwed up some of the questions look

28. myininaya

kidding a little

29. myininaya

in number 4 which is the shaded region

30. myininaya

31. ikram002p

for this one its C :P and thats all i know xD http://gyazo.com/7e43f8ee6a66384dfb6b5689e3bc447d

32. myininaya

I really don't understand how I can play with the symbols in 6 to get some better than what I already said like is there any other way to read <x>=x+x/2-2 if that is really what they meant to write and it has to be <w>=10 in order to even find w

33. myininaya

ok I think number 6 should not have that -2 there: the answer is 20/3 $<x>=x+\frac{x}{2} \\ <w>=w+\frac{w}{2} =10 \\ \frac{3w}{2}=10 \\ w=\frac{2(10)}{3}=\frac{20}{3}$

34. myininaya

Ok for some reason 8 is D.... I thought we were suppose to pick 1 or 2 or both to see which implied y<0 well if -5y>0 then y<0 but if -y^5<0 then y^5>0 and so y>0 so I don't see how 8 is D

35. myininaya

anyways I'm going to stop playing with this

36. beginnersmind

@ikram002p @Loser66 "for this one its C :P and thats all i know xD http://gyazo.com/7e43f8ee6a66384dfb6b5689e3bc447d " I think it's B actually, but the question is really poorly worded. I _think_ they are asking whether statement (1) alone implies 5a-9b=0 (P). Or if (2) alone implies P. Or if (1) and (2) implies P. etc. In this case 25a = 45b does imply 5a-9b = 0, so (B) is true.

37. myininaya

yes B is correct for that one

38. myininaya

1A 2A 3C 4A 5C 6A 7D 8D 9B 10B Imputing the above will give a score of 100

39. ikram002p

haha yeah i must made a silly typo

40. zzr0ck3r

this is silly. First. If it is an operation (binary?) then it is a function from some AxAxA.... into some set B, depending if it is unary, binary, ...... Since it is implied that we can perform this operation on one value w, then it must be unary. So we have a function f:A->B. Now lut us rephrase the questions We have a function f s.t. f(x) =x+x/2+2 when x<= 10. Now the fact that x<= 10 implies that the set A is a subset of R. So that f(w) is not defined.

41. zzr0ck3r

But ok let us say there is some set A, s.t. w,10 are both in A. Well now we can have the function be defined for both 10 and w. But then the question is, what is the value of w. which of course we do not know since we argued that this set must contain 10 and w and we were not given the definition of the set, so this cant be a function as they come with a rule by definition.

42. zzr0ck3r

sorry, it's a special day in Oregon and I got meta.

43. Loser66

@zzk0ck3r When you have time, please continue your argument. @myininaya Thanks for trying. You tried on it and got 100. So that you didn't know what is going on when you get wrong. If you get something wrong, you have no way to know which one is wrong and how to fix it. Because they give you the score and the percentage only, no explanation, no point out the wrong answer. Anyway, that is the good site to practice solving basic math problems in shortest time. I am looking for GRE for math students. If you know some free site, please send me the link. Much appreciate. :)

44. zzr0ck3r

That was it, either way we get something that does not make sense

45. zzr0ck3r

For a function, you must not only have it be well defined and defined everywhere, you must have a rule for the map. In the second case we have no way of assigning that rule to w because we dont know what w is :)

46. zzr0ck3r

A function is a set of ordered pairs and without the rule we cant make the pairs, so we don't have a function, so we don't have an operation.

47. Loser66

Thank you for the explanation. :)