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Alexxx [7]
3 years ago
10

Lucia finds that (3x^2+3x+5) + (7x^2-9x+8) = 10x^2-12x+13. What error did Lucia make?

Mathematics
1 answer:
son4ous [18]3 years ago
4 0
The answer 
to do the calculus, the method is 
taking off the paranthesis
adding the term with a similar degree
summing constant terms

 (3x^2+3x+5) + (7x^2-9x+8) = 

  = 3x^2+3x+5 +  7x^2-9x+8
  
  = 3x^2 +  7x^2  + 3x+5 - 9x+8
 = 10x²  + 3x - 9x +5 +8 
 = 10x² - 6x + 13
the answer is 
(3x^2+3x+5) + (7x^2-9x+8) =10x² - 6x + 13

the error that Lucia did make  3x - 9x = -12x, instead of 3x - 9x = -6x
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Answer:

Not a function.

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B.

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4 0
3 years ago
Working together, it takes Sam, Jenna, and Francisco two hours to paint one room. When Sam works alone, he can paint one room in
lutik1710 [3]

Answer:  12 hours

Step-by-step explanation:

Given : Working together, it takes Sam, Jenna, and Francisco two hours to paint one room.

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Let 't' be the time taken by Francisco to paint one room on his own.

Then , we have

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\dfrac{1}{6}+\dfrac{1}{4}+\dfrac{1}{t}=\dfrac{1}{2}

i.e.  \dfrac{1}{t}=\dfrac{1}{2}-(\dfrac{1}{6}+\dfrac{1}{4})

i.e.  \dfrac{1}{t}=\dfrac{1}{2}-(\dfrac{4+6}{24})

i.e.  \dfrac{1}{t}=\dfrac{1}{2}-\dfrac{10}{24}

i.e.  \dfrac{1}{t}=\dfrac{1}{2}-\dfrac{5}{12}

i.e.  \dfrac{1}{t}=\dfrac{6-5}{12}

i.e.  \dfrac{1}{t}=\dfrac{1}{12}

i.e. t= 12

Hence,  Francisco would take 12 hours to  paint one room on his own.

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3 years ago
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4 0
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8% of the stereo sale price comes out to 0.08($836.00) = $66.88

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5 0
3 years ago
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