Intro to Matrices Practice

How many rows are in a 7 x 3 matrix?

• 7

• 3

• 21

• 10

How would a scalar multiplication be carried out for a matrix?

• Add the Scalar to every element in the matrix

• Dot product the rows of one matrix with the columns of the other matrix

• Multiply every element with the scalar to create a new matrix

• subtract the elements in the first matrix from the elements of the second matrix

What must be true in order to ADD two matrices?

• They must be square.

• The dimensions must be equal.

• The determinant can't equal 0.

• The column of the 1st must equal the row of the 2nd.

A Symmetric Matrix

• square matrix

• at least one number in leading diogonal

• it is equal to its own transpose

• all number in leading diagonal is 1

Determine the type of the matrix

• Upper Triangular Matrix

• Identity Matrix

• Diagonal Matrix

• Lower Triangular Matrix

• Row Matrix

If matrix A is a 2 x 5, and is transposed, what are the new dimensions?

• 2 x 2

• 5 x 2

• 5 x 5

• 2 x 5

• a

• b

• c

• d

Determine the type of the matrix

• Upper Triangular Matrix

• Identity Matrix

• Diagonal Matrix

• Lower Triangular Matrix

• Row Matrix

What is a matrix?

• A matrix is a type of computer program.

• A matrix is a type of fabric used in clothing.

• A matrix is a type of food made from corn.

• A matrix is a rectangular array of numbers, symbols, or expressions arranged in rows and columns.

What are the dimensions of this matrix?

• 2 x 3

• 3 x 2

• 6 x 1

• 1 x 6