Please help me get 2% by helping me solve this question (Very Important)

  • Thread starter Mafiaboy
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  • #1
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This is an advance function question that our teacher gave us as a bonus question. Right now my percentage is around 79 and if i get this question right i can get at least 83 in my final mark. So it will be very very very appreciated if someone can help me solve this question ASAP, i only have 2 days left to hand it in. Here is the exact format of the question:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Q: We define a function first:

[X]up = the smallest integer
bigger than X.

[[ so, for example, [-2]up = -1

[-1.4]up = -1 , [-1]up = 0

[0.4]up=1 , [17]up =18

etc. ]]


Here is a relation:

n[X]up = [nX]up

Find the domain of this relation for n and the domain for X. You must Prove your answer

((Just to give another question, as an example, if the relation were:
X2+n2 =4, the domain for X is -2 < X < 2
the domain for n is -2 < n < 2


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

Answers and Replies

  • #2
HallsofIvy
Science Advisor
Homework Helper
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I find it difficult to believe that your teacher said, "This is a bonus question. Go find someone to tell you the answer and I will give you an additional 4 points."

Wouldn't it be better (and more honest) to at least try to do the problem yourself?
 
  • #3
499
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Interesting problem. Is n an integer?
 
  • #4
7
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c'mmon help me out people, i have to hand it in tomorrow!


I find it difficult to believe that your teacher said, "This is a bonus question. Go find someone to tell you the answer and I will give you an additional 4 points."

Wouldn't it be better (and more honest) to at least try to do the problem yourself?

if you can't solve don't bother commenting plz.
 
  • #5
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It's a general policy in this forum that we don't do your work for you. If you want help, you have to show that you have made an effort on your own.
 
  • #6
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It's a general policy in this forum that we don't do your work for you. If you want help, you have to show that you have made an effort on your own.
i said help me solve the question not asking for you to solve. I just need guidance on where to to start and so on and making the question bit clearer.
 
  • #7
35,028
6,774
OK, here's a start. The relation is n[X]up = [nX]up.

Put some numbers in for n and see what you can conclude from each one as far as the values for x. Describe in words the values of x that can be used on each side separately.

1. 2[x]up = [2x]up
2. -3[x]up = [-3x]up
3. .5[x]up = [.5x]up
 
  • #8
7
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OK, here's a start. The relation is n[X]up = [nX]up.

Put some numbers in for n and see what you can conclude from each one as far as the values for x. Describe in words the values of x that can be used on each side separately.

1. 2[x]up = [2x]up
2. -3[x]up = [-3x]up
3. .5[x]up = [.5x]up

ok thanks i guess, though it wasn't that helpful. Anyway lets see what i can come up with.
 

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