anonymous
  • anonymous
0.26(x+40)+0.37(x+20)=-20
TriC-MathMOOC
katieb
  • katieb
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tkhunny
  • tkhunny
Were you planning to solve that? Let's see it!
anonymous
  • anonymous
@tkhunny i dont know how to. i got the wrong answer i just want to see the steps. can you help me?
tkhunny
  • tkhunny
Doesn't work that way. Prove that you can do SOEMTHING. 0.26(x+40)+0.37(x+20)=-20 Do one piece at a time. 0.26(x+40) Can you expand that?

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anonymous
  • anonymous
.26x+10.4
anonymous
  • anonymous
@tkhunny
tkhunny
  • tkhunny
Perfect. Now the next piece. 0.37(x+20)
anonymous
  • anonymous
@tkhunny .37x + 7.4
tkhunny
  • tkhunny
There you have it. Which part of that could you not do previously? Now add them all up! 0.26x + 10.4 + 0.37x + 7.4
anonymous
  • anonymous
@tkhunny 3+0.11x=-20 -3 -3 0.11x=-23 divide 0.11x x=-209
tkhunny
  • tkhunny
0.26x + 0.37x = 0.63x 10.4 + 7.4 = 17.8 Why are you feeling a need to subtract? Did you write the problem statement incorrectly?
anonymous
  • anonymous
@tkhunny ohhhhh okay thank you i get it. can you help me get through other ones please?
anonymous
  • anonymous
2/5x-1/3x=2 @tkhunny
tkhunny
  • tkhunny
You'll have to be more clear. is "2/5x" this \(\dfrac{2}{5x}\) or this\(\dfrac{2}{5}x\)? Use parentheses to be clear.
anonymous
  • anonymous
\[\frac{ 2 }{ 5 }x\]
anonymous
  • anonymous
@tkhunny
tkhunny
  • tkhunny
Now we add fractions? Denominators are 5 and 3. Go!

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