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number properties problem

Expert replies
by smallsorrow » Mon Sep 22, 2008 7:07 am
How many integers n are there such that
1< 5n+5 < 5

A) five
B) four
C) three
D) two
E) one

OA follows...

Do you include 0 for n???
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Source: — Problem Solving |

by stop@800 » Mon Sep 22, 2008 7:30 am
Please reverify the question, I think you have done some typo :)
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by toudavis » Mon Sep 22, 2008 7:33 am
This one should be solved by solving for the inequality on both sides.

1<5+5n<25
Subtract 5 from both sides, then divide by 5 on both sides.
That leaves you with this:

-4/5<n<4

So the integers that fall in that range are 0,1,2,3

Hope that helps
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by smallsorrow » Mon Sep 22, 2008 7:33 am
typo, me --- no way :-)

here we go

it is 1<5n+5<25
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by smallsorrow » Mon Sep 22, 2008 7:39 am
Thanks - I just was not sure about 0 ...
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by EricLien9122 » Mon Sep 22, 2008 8:58 am
0 is consider an integer. So ya, you include 0.
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