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# How do you determine how many entries are in a matrix?

To determine the number of entries in a matrix, count the number of elements inside the brackets. For example, a matrix having the elements -5, 2, 10, 4, 19 and -4 has six entries.

Continue ReadingThe entries in a matrix are organized into rows and columns. The number of rows and columns are known as the dimensions. By convention, the notation for matrix dimensions is rows by columns. For example, if each row of a matrix each has two entries and each column has three entries, the matrix's dimensions are two by three. If each row has four entries and each column has three entries, the matrix's dimensions are four by three.

The position of an entry in a matrix is indicated by a subscript of the respective entry's row followed by its column. For example, if an entry a has the subscript 23, it's in the second row and the third column of the matrix. Additionally, if entry b has subscript 34, it's in the third row and the fourth column of the matrix.

The first non-zero entry in each row of a matrix is referred to as the leading entry. For example, if a row in a matrix has entries 0, -5, 1 and 3 in that order, then -5 is the leading entry.

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Q:
## What is a diagonal matrix?

A: A diagonal matrix is a square matrix that has non-zero elements only in the diagonal that runs from the top left to the bottom right. A diagonal matrix is ... Full Answer >Filed Under: -
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## What is a singular matrix?

A: A singular matrix, also called degenerate matrix, is a square matrix whose determinant is zero and that doesn't have a matrix inverse. It's rare to come ac... Full Answer >Filed Under: -
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## What is a 3x3 multiplication matrix?

A: A 3x3 matrix is a matrix that consists of three rows and three columns. Matrices are an array of numbers that can be added, subtracted and multiplied. Full Answer >Filed Under: -
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## What is the inverse of a 2x2 matrix?

A: The inverse of a two-by-two matrix is another two-by-two matrix that, when multiplied by the original matrix, gives the identity matrix. Gauss-Jordan elimi... Full Answer >Filed Under: