# Worksheet: Introduction to Matrices

In this worksheet, we will practice identifying matrices and determining the order of a matrix and the position of each of its elements.

Q1:

Which of the following is the matrix , where and ?

• A
• B
• C
• D

Q2:

Find the matrix , with an order of , whose elements are given by the formula .

• A
• B
• C
• D

Q3:

Which of the following is the matrix , where and ?

• A
• B
• C
• D

Q4:

Given that is a matrix of order , where , , , , , and , determine .

• A
• B
• C
• D

Q5:

Given that find , , and .

• A, ,
• B, ,
• C, ,
• D, ,

Q6:

Given what is ?

Q7:

Given which are the negative entries of ?

• A, , ,
• B, , ,
• C, , ,
• D, , ,
• E, , ,

Q8:

Given that is a matrix of order , with , , , and , find the matrix .

• A
• B
• C
• D
• E

Q9:

The table below represents the prices of some drinks in a café. The café owner changes the prices of the drinks, so that each drink is now two times its original price. Determine the matrix that represents the new prices of the drinks.

DrinkSmall SizeBig Size
Strawberry Juice1.55.5
Orange Juice28.5
Mango Juice3.59
• A
• B
• C
• D

Q10:

The given bar chart shows actual and predicted data for several continents about the percent of the population who live in urban areas. Represent this data in a matrix where the rows represent years in order from past to future, and the columns represent the continents in alphabetical order. • A
• B
• C
• D
• E

Q11:

The coach of a school basketball team recorded the statistics of three players in a tournament as follows: Jacob: 7 matches, 15 shots, and 5 goals; Jack: 13 matches, 24 shots, and 8 goals; and, Thomas: 16 matches, 23 shots, and 19 goals. Arrange these data in a matrix where the rows represent the players from least goals to most, the first column gives the number of matches, the second column gives the number of shots, and the third column gives the number of goals.

• A
• B
• C
• D

Q12:

A company produces televisions with 32-inch, 42-inch, and 48-inch screens. The first table gives the number of televisions of each screen size produced in factories A and B during January 2016. The second table gives the same information for February 2016. Express the total number of televisions of each screen size produced in the 2 months by each factory, A and B, in a matrix.

Screens produced during January 2016:

Factory32 inches42 inches48 inches
A820770500
B690660620

Screens produced during February 2016:

Factory32 inches42 inches48 inches
A560550830
B520700660
• A
• B
• C
• D

Q13:

The bar chart shows the number of kilowatt-hours of energy produced and consumed in three countries over a certain time period. Represent these data in a matrix whose rows represent Brazil, France, and Canada, in that order, and whose columns represent production and consumption, in that order. • A
• B
• C
• D

Q14:

If the order of matrix is , then how many rows does it have?

Q15:

Find the order of the matrix .

• A
• B
• C
• D
• E

Q16:

How many elements are there in a matrix of order ?