Question

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

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

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.

Answer 5

So??? what is the answer?

Answer 6

What are you confused about?

Answer 7

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?

Answer 8

could you fix up number 6 a little

Answer 9

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

Answer 10

To your logic, the last one is the corrext answer, right?

Answer 11

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

Answer 12

I mean to make it readable

Answer 13

it makes no sense as is

Answer 14

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

Answer 15

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.

Answer 16

yep they don't make it make anymore sense

Answer 17

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

Answer 18

\[<w>=10\]

Answer 19

\[10=w+\frac{w}{2}-2 \]

Answer 20

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

Answer 21

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

Answer 22

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

Answer 23

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

Answer 24

It really is not clear what they are saying there

Answer 25

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

Answer 26

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.

Answer 27

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

Answer 28

kidding a little

Answer 29

in number 4 which is the shaded region

Answer 30

the darker shade or the lighter shade

Answer 31

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

Answer 32

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

Answer 33

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

Answer 34

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

Answer 35

anyways I'm going to stop playing with this

Answer 36

@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.

Answer 37

yes B is correct for that one

Answer 38

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

Answer 39

haha yeah i must made a silly typo

Answer 40

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.

Answer 41

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.

Answer 42

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

Answer 43

@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. :)

Answer 44

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

Answer 45

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 :)

Answer 46

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.

Answer 47

Thank you for the explanation. :)