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Problem 1

# Find the dimensions of the given matrix and identify the given entry. $$A=\left[\begin{array}{llll} 1 & 5 & 0 & \frac{1}{4} \end{array}\right] ; a_{13}$$

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The dimensions of the given matrix $$A$$ are 1x4, and the entry $$a_{13}$$ is 0.
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## Step 1: Finding the dimensions of the matrix

In order to find the dimensions of the matrix, count the number of rows and columns. The given matrix has only one row and four columns. Therefore, its dimensions are 1x4.

## Step 2: Identifying the entry a_{13}

To identify the entry a_{13}, look for the element in the first row and third column. In this case, the element a_{13} is 0.

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