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Mashcka [7]
3 years ago
15

Arlene is showing her work in simplifying −7.9 + 8.2 − 3.4 + 2.1. Identify any errors in her work or in her reasoning. Write fee

dback to Arlene explaining the mistake she made and how to correct her work.
the way she did it was

Step Work Reasoning
−7.9 + 8.2 − 3.4 + 2.1 Original problem
1 −7.9 + 8.2 + (−3.4) + 2.1 Additive inverse
2 −7.9 + (−3.4) + 8.2 + 2.1 Associative property
3 (−7.9 + (−3.4)) + (8.2 + 2.1) Commutative property
4 −11.3 + 10.3 Simplify
5 −1 Simplify
Mathematics
2 answers:
kodGreya [7K]3 years ago
7 0
The answer is correct but i do not know what ARLENE did wrong
Ivanshal [37]3 years ago
7 0

She wrote +(-3.4) wrong

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kumpel [21]

Answer: A. 4(8x + 2), and C. 32x + 8

Step-by-step explanation:

Put the equations together and if they have infinitely many solutions they'll both be equal to each other.

CORRECT 4(7x + 2 + x)=4(8x + 2)

7x+2+x=8x+2

8x+2=8x+2 (Infinitely Many Solutions)

CORRECT 4(7x + 2 + x)=32x+8

4(8x+2)=32x+8

32x+8=32x+8

32x+8=32x+8 (Infinitely Many Solutions)

INCORRECT 4(7x + 2 + x)=4(7x + 3)

8x+2=7x+3

8x=7x+1

8x−7x=1

x=1

INCORRECT 4(7x + 2 + x)=28x + 12

4(8x+2)=28x+12

32x+8=28x+12

32x=28x+4

32x−28x=4

4x=4

x=1

Hope this helps, now you know the answer and how to do it. HAVE A BLESSED AND WONDERFUL DAY! As well as a great Valentines Day! :-)  

- Cutiepatutie ☺❀❤

4 0
4 years ago
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An odd number between 301 and 370 has three different digits. If the sum of its digits is five times the hundreds digit, find th
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For the answer to the question above, <span> 
5x3 (the hundreds digit)= 15
so 3+x+y=15. 15-3=12. x+y=12.
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