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Murrr4er [49]
3 years ago
11

Hiroto paid $4.28 in sales tax for the items that he purchased.

Mathematics
1 answer:
Katena32 [7]3 years ago
8 0

Answer:

  $68.48

Step-by-step explanation:

You want to find cost such that ...

  6.25% × cost = $4.28

Dividing by the coefficient of cost, we get ...

  cost = $4.28/0.0625 = $68.48

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Is matrix multiplication comutative?
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Step-by-step explanation:

The matrix multiplication can be performed if the number of columns of the first matrix is equal to the number of rows of the second matrix

Let A with dimension mxn and B with dimension nxp represent two matrix

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The matrix multiplication result is a matrix which entries are given by dot product of the corresponding row of the first matrix and the corresponding column of the second matrix:

A=\left[\begin{array}{ccc}a11&a12\\a21&a22\end{array}\right]\\B= \left[\begin{array}{ccc}b11&b12\\b21&b22\end{array}\right]\\AB = \left[\begin{array}{ccc}a11b11+a12b21&a11b12+a12b22\\a21b11+a22b21&a21b12+a22b22\end{array}\right]\\\\BA=\left[\begin{array}{ccc}b11a11+b12a21&b11a12+b12a22\\b21a11+b22ba21&b21a12+b22a22\end{array}\right]

Notice that in general, the result is not the same. It could be the same for very specific values of the elements of each matrix.

6 0
3 years ago
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