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Mazyrski [523]
3 years ago
8

Find a 33 matrix Sij so that the product SijA is the same as the matrix A after applying the row operation Ri $ Rj .

Mathematics
1 answer:
aleksklad [387]3 years ago
6 0

Answer:

We want the ith row of the new matrix SijA to be the old jth row of A, so we need the ith row of Sij to extract the jth entry of column of A.

This mean the ith row of Sij must have a 1 in the jth entry and 0's everywhere else.

Similarly, the jth row of Sij must have a 1 in the ith entry and 0's everywhere else.

in the piecewise notation this is

(Sij)kl ={1 if k=i and l=j, 1 if k=k and l=i; 1 if k=l but k#i,j, 0 otherwise

Step-by-step explanation:

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Clint is in study hall reading The hunger games. After 20 minutes, he is on page 151. After 45 minutes, he is on page 181. How m
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The number of pages had Clint read prior to study hall were <u>127 pages</u>.

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Clint after 20 minutes is on page 151.

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Now, to find the pages Clint read prior to study hall.

<em>The time difference = 45 minutes - 20 minutes.</em>

<em>                                  =  25 minutes.</em>

<em>Difference between the pages = 181 - 151</em>

<em>                                                     =  30 pages.</em>

If Clint is reading each page at same speed.

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Thus, in 20 minutes he can read =1.2\times 20

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