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Reptile [31]
3 years ago
6

Which expression has the same value as 3,648 - 1,223? A. 3,000 - 1,000 + 40 - 20 + 8 - 3 + 6 - 2 B. 3,000 - 1,000 + 600 - 200 +

40 - 20 + 8 - 3 C. 3,000 - 1,000 + 600 - 200 + 8 - 3 + 3 - 2 D. 3,000 - 1,000 + 600 - 200 + 80 - 30 + 4 - 2
Mathematics
1 answer:
natulia [17]3 years ago
7 0

Answer:

B

Step-by-step explanation:

3000-1000 = 2000

600-200 = + 400

40 - 20 = + 20

8 - 3 = + 5

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Step-by-step explanation:

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Solve the following system of equations for all three variables.
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Answer:

Step-by-step explanation:

-2x + 3y – 4z = 8    ----------------(I)

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Add equation (I) & (II) and thus y will be eliminated

(I)        -2x + 3y – 4z = 8

(II)        <u>5x – 3y + 5z = -8</u>    {Add}

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Multiply equation (II) by (-1) and then add with equation (III). Thus y will be eliminated.

(II) * (-1)         -5x + 3y - 5z = +8

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(B)                 <u>2x - 2z  = 16</u>   {Add}

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Plug in x = 2 and z  = - 6 in equation (I)

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               3y = -12

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y = -4

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