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Question 156024This question is from textbook Algebra 1
: Hello, I would like to know, if possible can you please explain to me how these algebra problems are done, my daughter just started Algebra 1 and I have no idea how to do Algebra, so I'm am at my computer now googling and yahooing, trying to find out how to do these problems, thanks in advance for any help. Sincerely... A mom in need...
10+(-4)
-2(-6)
-7+7
-0.25-4
-5+23
-15+(-9)
okay these are just a few of the problems on her text book, however their basically all in the same frame of mind,,, hoping to get some insight on how to do these problems and teach my daughter how to do them as well. again thanks in advance for any help.
This question is from textbook Algebra 1
Found 2 solutions by stanbon, nerdybill:
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 10+(-4) = 6
Why? If you gain $10, then lose $4 you end up with $6
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-2(-6) = 12
Why? You twice did the opposite of losing $6; you end up with $12
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-7+7 = 0
Why? You lost $7, then you gained $7; you ended up even at zero.
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-0.25-4 = -4.25
Why?
You lost 25 cents; then you lost $4; you ended up $4.25 in the hole.
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-5+23 = 18
Why? You lost 5 then gained 23
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-15+(-9) = - 24
Why You lost 15, then lost 9
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Cheers,
Stan H.
Answer by nerdybill(7384)  (Show Source):
You can put this solution on YOUR website! Here are the rules. If you see TWO signs next to each other, use the following rules to change both to a single sign:
+ + replace with +
+ - replace with -
- + replace with -
- - replace with +
.
Same thing when MULTIPLYING:
+ + is a +
+ - is a -
- + is a -
- - is a +
.
Looking at your problems:
10+(-4)
I see a + - together -- replace with a -
10-4
= 6
.
-2(-6)
Multiplying - and - becomes a +
= 12
.
-7+7 = 0
.
-0.25-4= -4.25
.
-5+23 = 18
.
-15+(-9)
Replace + - with a -
-15-9 = -24
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