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Difficult time with math

 
 
Reply Thu 2 Sep, 2004 11:46 am
Hi all.
Would someone mind explaining to me the basic rules of solving Integers, & evaluating/simplifying Algebraic expressions? Rolling Eyes
Thanks.
Jess
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Type: Discussion • Score: 1 • Views: 501 • Replies: 7
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Brandon9000
 
  1  
Reply Thu 2 Sep, 2004 11:52 am
You might need to say a little more about it. Neither integers like:

4

or algebraic expressions like:

x + y

have anything about them to solve. Explain a little more about what you need, please.
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GirlAnachronism
 
  1  
Reply Thu 2 Sep, 2004 12:08 pm
Sorry.

Integers: (-3) - (-4)(+5)
------------------
(-2)


Simplify: 40st
-------
4

Evaluate: (22x - 12) - (-13x + 2)

Is that okay?
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FreeDuck
 
  1  
Reply Thu 2 Sep, 2004 12:26 pm
Real quick:

-- = +
+- = -

Maybe you want to know about order of operations. Do what's in parenthesis first, otherwise multiplication/division before addition/subtraction. Then you want to distribute your negative signs to eliminate parentheses.

So for your examples:

(-3) - (-4)(+5) (assuming that + is only there to indicate positive)

You would multiply -4 x 5 first, getting -20.
(-3) - (-20) = -3 +20 = 17

40st cannot be simplified

(22x - 12) - (-13x + 2) distribute first, since there is no multiplication or division

22x -12 +13x -2 = 35x -14
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GirlAnachronism
 
  1  
Reply Thu 2 Sep, 2004 12:29 pm
Thank you so much!


Jess
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lab rat
 
  1  
Reply Thu 2 Sep, 2004 02:42 pm
40st / 4 can be simplified--both 40 and 4 are divisible by 4.

The simplified expression is 10st / 1 = 10st
0 Replies
 
FreeDuck
 
  1  
Reply Thu 2 Sep, 2004 03:00 pm
Ah, good catch lab rat, I didn't realize that was division that was going on there. GirlA, you'll want to adjust what I gave you to account for the division in both of those.
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Brandon9000
 
  1  
Reply Thu 2 Sep, 2004 03:01 pm
lab rat wrote:
40st / 4 can be simplified--both 40 and 4 are divisible by 4.

The simplified expression is 10st / 1 = 10st

If the problem was:

40st
-----
4

Then the simplest way to look at it, which differs only a tiny bit from lab rats is:

40/4 = 10
40st/4 = 10st

remember that 40st is the same as 40 times s times t.
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