Understanding and using matrices

Use Matrix A provided to answer the following question.
Determine matrix element

 $a_{44}$  

• 4.3

• -0.9

• 7.1

• -13.2

The number of columns in a 2x12 matrix is?

• 10
• 24
• 12
• 2

What constitutes a matrix?

• -tabular

  -can contain numbers and variables

• -circular

  -only contains numbers

• -tabular

  -only contains numbers

• -circular

  -can contain numbers and variables

Answer explanation

Matrixes are rectangular/tabular arrays of numers, symbols, and expressions that are arranged in rows and collumns in order to represent a mathematical property.

Which of the following is a column matrix?

• B

• F

• D

• A

• UNDEFINED

• -5

• -1

• 7

What is the entry at r₃₁?

• 3

• 1

• 4

• 7

If this is matrix A, a₃₂ = ?

• 45
• 16
• 71
• 39

Matrices can be written in the form:

• r x l

• l x r

• c x r

• r x c

A diagonal matrix, all of whose diagonal elements are 1, is called:

• Diagonal matrix

• Scalar matrix

• Null matrix

• Unit matrix

The order of a matrix is  $a_{mn}$ , what is m and n?

• m is the number of its rows

• m is the number of its columns

• n is the number of its rows

• n is the number of its columns