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Engineer's Math Help Thread v.2
Topic Started: Sep 7 2011, 09:25 PM (961 Views)
Optimus Banana
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Ok just wondering cause I know how to do most problems but we have to test over them. Im in Algebra 2. I personally think it's stupid to have to memorize formulas but oh well.
Edited by Optimus Banana, Sep 15 2011, 01:05 AM.
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Plush
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The gun that won that old Wild West

need some help again... I got my progress report and I have all A's and B's but I've got a damn D in math, I really need to stop slacking off.

anyways, this stuff we're doing now is fairly simple, but I'm a bit confused with some problems. I can answer these questions pretty easily but the thing is, he wants us to work them out, so even if we've got the answer, it's still wrong unless we actually show our work. here's an example...

a - 5 = 8
+5 +5
10 13
a =13
13-5 = 8

(the +5's are supposed to be under the 5 and the 8, fyi, it just doesn't show up for some reason)

pretty simple, right? but then I come to a problem like this

37 = c - 29 or 21 + m = 4 or 28 = g + 28

I'm not sure how to work those out, and I'm not even sure what it means. 21 + m = 4 is kind of confusing, I don't really get it....

Edited by Plush, Sep 18 2011, 10:07 PM.
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Rockman
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hoighty-toighty

Stewbear
Sep 18 2011, 10:06 PM
need some help again... I got my progress report and I have all A's and B's but I've got a damn D in math, I really need to stop slacking off.

anyways, this stuff we're doing now is fairly simple, but I'm a bit confused with some problems. I can answer these questions pretty easily but the thing is, he wants us to work them out, so even if we've got the answer, it's still wrong unless we actually show our work. here's an example...

a - 5 = 8
+5 +5
10 13
a =13
13-5 = 8

(the +5's are supposed to be under the 5 and the 8, fyi, it just doesn't show up for some reason)

pretty simple, right? but then I come to a problem like this

37 = c - 29 or 21 + m = 4 or 28 = g + 28

I'm not sure how to work those out, and I'm not even sure what it means. 21 + m = 4 is kind of confusing, I don't really get it....

Stewbear, its exactly the same thing.

37 = c - 29 is equal to -29 + c = 37
21 + m = 4 is equal to m + 21 = 4
28 = g + 28 is equal to 28 + g = 28

-29 + c = 37
c = 37 + 29

m + 21 = 4
m = 4 - 21

28 + g = 28
g = 28 - 28
g = 0

Just remember, you want to isolate the variable on one side, with the numbers on the other side. Just move things over to the other side, and remember that you have to change the sign when you do it. If its negative 5, then when you move it over its positive 5.
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Plush
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The gun that won that old Wild West

so, would this be correct?

-29 + c = 37
37 + 29 = 66
c = 66

m + 21 = 4
m = 4 - 21
m = -25

28 + g = 28
g = 28 - 28
g = 0

and one more question, what about a problem like this?

p - 24 = - 53

so you're supposed to do the opposite of the sign right? so if it's subtraction you're actually supposed to add, right? so it'd be

p - 24 = 53
+24 +53
48 106

well, I'm obviously doing something wrong there but I'm not sure what... I mean, I know the answer is 77 but how am I supposed to get 77? do I just do this

p - 24 = 53
77 - 24 = 53
p = 77

is that considered working it out?
Edited by Plush, Sep 19 2011, 01:28 AM.
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Rockman
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hoighty-toighty

Stewbear
Sep 19 2011, 01:22 AM
so, would this be correct?

-29 + c = 37
37 + 29 = 66
c = 66

m + 21 = 4
m = 4 - 21
m = -25

28 + g = 28
g = 28 - 28
g = 0

and one more question, what about a problem like this?

p - 24 = - 53

so you're supposed to do the opposite of the sign right? so if it's subtraction you're actually supposed to add, right? so it'd be

p - 24 = 53
+24 +53
48 106

well, I'm obviously doing something wrong there but I'm not sure what... I mean, I know the answer is 77 but how am I supposed to get 77? do I just do this

p - 24 = 53
77 - 24 = 53
p = 77

is that considered working it out?
m + 21 = 4
m = 4 - 21
m = -25

Actually 4-21= -17
Here are some examples. I think you may just be getting your basics mixed up.
-21 + 4 = -17
21 + 4 = 25
-21 + -4 = -25
-21 - (-4) = -17
-----------------------------
p - 24 = 53
77 - 24 = 53
p = 77
This is an incorrect way to show your work.

Take that, and instead just do this
p - 24 = 53
p = 53 + 24
p = 77
Edited by Rockman, Sep 19 2011, 01:53 AM.
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Plush
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The gun that won that old Wild West

just one more post just to see if I've got this right... here are some I did

q + 8 = 57
57 - 8 = 49
49 + 8 = 57
q = 49

r - 23 = -6
6 + 23 = 29
29 - 23 = 6
r = 29

right? or not?
Edited by Plush, Sep 19 2011, 03:25 AM.
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Rockman
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hoighty-toighty

Stewbear
Sep 19 2011, 03:25 AM
just one more post just to see if I've got this right... here are some I did

q + 8 = 57
57 - 8 = 49
49 + 8 = 57
q = 49

r - 23 = -6
6 + 23 = 29
29 - 23 = 6
r = 29

right? or not?
q + 8 = 57
57 - 8 = 49
49 + 8 = 57
q = 49

I don't know what you're doing on the third line there. But it seems you're confusing yourself. Here you got the right answer.

r - 23 = -6
6 + 23 = 29
29 - 23 = 6
r = 29

Here you didn't.
r - 23 = -6
r = -6 + 23
r = 17

I'm not really sure what you're doing on that second and third line. But whatever it is, it's doing more harm than good. Especially with negative numbers, and your ability to add them.
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+ Rebel X
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Engineer
Sep 13 2011, 01:30 AM
Oh, overly eager friends I have. lol.
Which is why i just sit back and let you enjoy this orgasmic topic you've produced for the second time :]

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