Applications of Matrices

What percent of 1-year-old survive into the 2-year-old age group?

• 40%

• 50%

• 80%

• 0%

Consider the Leslie matrix given on the left. How many age groups are there?

• 2

• 3

• 4

• 9

• 
• 
• 
• 

What do w, x, y and z equal in this matrix equation?

• w = 13, x = 4, y = 7, z = 23

• w = 13, x = -4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 17

Find 3B - 2A

• [22 25]

  [17 3]

• [14 5]

  [-11 3]

• [-14 5]

  [11 -3]

• none of these

Find A+B

• 8     10
  8      1 

• 12     25
  7     1

• 10     30
  0     1

• can't add two together because the rows dont match columns

Find B-A

• -4     0
  6     -1

• 1     0
  1     -4

• 4       0
  -6     1

• not possible because rows do not match columns

In Matrix R (pictured) what is the value of element R_3,2

• 8

• 9.01

• 6

• 1

Find the values of w,x, y and z.

• w = 13, x = 4, y = 7, z = 23

• w = 13, x = -4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 17

Dimensions?

• a

• b

• c

• d