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Nataliya [291]
4 years ago
7

What are the dimensions of the matrix?

Mathematics
1 answer:
dusya [7]4 years ago
6 0
The dimension of a matrix is the no of rows by the no of columns.

Here there are two rows and  five column. So the dimensions of the matrix is 2 x 5
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Three numbers are in ratio 2:5:7. <br> The middle number is 75. What are the other two numbers?
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Answer:

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Step-by-step explanation:

2/5 of 75 would be 30, so it is the answer.

7/5 of 75 would be 105, so it is the answer.

This is how you would solve this problem.

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4a + 9b + 0c = 8   ⇒ 4a + 9b + 0c = 8
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0a + 6b + 6c = -1   12a + 9b + 6c = 7
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8a + 0b + 6c = -1 ⇒ 8a + 0b + 6c = -1                                                   <u>-24c</u> = <u>14</u>
0a + 6b + 6c = -1 ⇒ <u>0a + 6b + 6c = -1</u>                                                    -24    -24
                               8a + 6b + 12c = 0                                                          c = ⁷/₁₂
                                                                                                      6b + 6(⁷/₁₂) = -1
                                                                                                         6b + 3¹/₂ = -1
                                                                                                        <u>       - 3¹/₂   - 3¹/₂</u><u>
</u>                                                                                                                   <u>6b</u> = <u>-4¹/₂
</u>                                                                                                                    6        6<u>
</u>                                                                                                                    b = ³/₄
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                                                                                                        4a + 6³/₄ = 8
                                                                                                        <u>     - 6³/₄   - 6³/₄
</u>                                                                                                                  <u>4a</u> = <u>1¹/₄</u>
                                                                                                                   4       4
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                                                                                      (a, b, c) = (⁵/₁₆, ³/₄, ⁷/₁₂)

8 0
4 years ago
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