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EastWind [94]
2 years ago
10

Plz help.... Ma teacher's Gon kill me.....lol

Mathematics
1 answer:
erik [133]2 years ago
4 0
Answers:

1. 74856 + 1489
= 76345

2. 42000/5
= 8400

3. 142100/10
= 14210

4. 2500 + (8-5)
2500 + 3
= 2503

5. 385 + (29 - 9)
385 + 20
= 405

6. 1780 - 643
= 1137

7. 4 x 2 + 30 / 5
4 x 2 + 6
8 + 6
= 14

8. 65743 - 754
= 64989
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Kelsey solved the following equation:
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Step-by-step explanation:

Replacement of -1/2(8x +2) by -4x -1 is use of the <em>distributive property</em>, eliminating choices B and D.

In step 3, addition of 1 to both sides of the equation is use of the <em>addition property of equality</em>, eliminating choice C. This leaves only choice A.

_____

<em>Additional comment</em>

This problem makes a distinction between the addition property of equality and the subtraction property of equality. They are essentially the same property, since addition of +1 is the same as subtraction of -1. The result shown in Step 3 could be from addition of +1 to both sides of the equation, or it could be from subtraction of -1 from both sides of the equation.

In general, you want to add the opposite of the number you don't want. Here, that number is -1, so we add +1. Of course, adding an opposite is the same as subtracting.

In short, you can argue both choices A and C have correct justifications. The only reason to prefer choice A is that we usually think of adding positive numbers as <em>addition</em>, and adding negative numbers as <em>subtraction</em>.

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Write 14/5 as a mixed number in simplest terms.
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The answer you are looking for is 2 4/5. Hope this helps.
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3 years ago
Read 2 more answers
Help me please! which one is correct?
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Step-by-step explanation:

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