1. Alg 2 - Chapter 4 Jeopardy 10 20 30 40 50 Matrix Operations
Multiplying Matrices
Determinants, Area of Triangle & Cramer's Rule
Identity and Inverse Matrices
Solving Systems Using Inverse Matrices 10 20 30 40 50

2. 10 points
Category

3. 10 points - Answer
Category

4. Perform the indicated operation.
20 points
Perform the indicated operation.
Category

5. Perform the indicated operation.
20 points - Answer
Perform the indicated operation.
Category

6. Perform the indicated operation.
30 points
Perform the indicated operation.

7. Perform the indicated operation.
30 points - Answer
Perform the indicated operation.

8. 40 points
Solve the matrix equation for x and y.

9. 40 points - Answer
Solve the matrix equation for x and y.

10. 50 points
Solve the matrix equation for x and y.

11. 50 points - Answer
Solve the matrix equation for x and y.

12. 10 points

13. 10 points - Answer

14. Perform the indicated operation.
20 points
Perform the indicated operation.

15. Perform the indicated operation.
20 points - Answer
Perform the indicated operation.

16. Perform the indicated operation.
30 points
Perform the indicated operation.

17. Perform the indicated operation.
30 points - Answer
Perform the indicated operation.

18. Perform the indicated operation.
40 points
Perform the indicated operation.

19. Perform the indicated operation.
40 points - Answer
Perform the indicated operation.

20. Perform the indicated operation.
50 points
Perform the indicated operation.

21. Perform the indicated operation.
50 points - Answer
Perform the indicated operation.

22. 10 points
NO CALCULATOR!

23. 10 points - Answer
NO CALCULATOR!

24. Evaluate the determinant of the matrix.
20 points
NO CALCULATOR!
Evaluate the determinant of the matrix.

25. Evaluate the determinant of the matrix.
20 points - Answer
NO CALCULATOR!
Evaluate the determinant of the matrix.

26. Evaluate the determinant of the matrix.
30 points
NO CALCULATOR!
Evaluate the determinant of the matrix.

27. Evaluate the determinant of the matrix.
30 points - Answer
NO CALCULATOR!
Evaluate the determinant of the matrix.

28. Find the area of the triangle with the given vertices.
40 points
NO CALCULATOR!
Find the area of the triangle with the given vertices.

29. Find the area of the triangle with the given vertices.
40 points - Answer
NO CALCULATOR!
Find the area of the triangle with the given vertices.

30. You MAY use a CALCULATOR!
50 points
You MAY use a CALCULATOR!
Use Cramer's rule to solve the linear system. Show what you are entering in your calculator.

31. 50 points - Answer You MAY use a CALCULATOR!
Use Cramer's rule to solve the linear system.
Show what you are entering in your calculator.

32. Write the identity 3x3 matrix
10 points
Write the identity 3x3 matrix

33. Write the identity 3x3 matrix
10 points - Answer
Write the identity 3x3 matrix

34. 20 points
NO CALCULATOR!

35. 20 points - Answer

36. Find the inverse of the matrix. SHOW WORK!
30 points
NO CALCULATOR!
Find the inverse of the matrix. SHOW WORK!

37. Find the inverse of the matrix. SHOW WORK!
30 points - Answer
NO CALCULATOR!
Find the inverse of the matrix. SHOW WORK!

38. Find the inverse of the matrix. SHOW WORK!
40 points
NO CALCULATOR!
Find the inverse of the matrix. SHOW WORK!

39. Find the inverse of the matrix. SHOW WORK!
40 points - Answer
NO CALCULATOR!
Find the inverse of the matrix. SHOW WORK!

40. Find the inverse of the matrix. SHOW WORK!
50 points
NO CALCULATOR!
Find the inverse of the matrix. SHOW WORK!

41. Find the inverse of the matrix. SHOW WORK!
50 points - Answer
NO CALCULATOR!
Find the inverse of the matrix. SHOW WORK!

42. You MAY use a CALCULATOR!
10 points
You MAY use a CALCULATOR!
Solve the matrix equation. Show what you are entering in your calculator.

43. You MAY use a CALCULATOR!
10 points - Answer
You MAY use a CALCULATOR!
Solve the matrix equation.Show what you are entering in your calculator.

44. 3x – 7y = -16 -2x + 4y = 8 20 points You MAY use a CALCULATOR!
Use an inverse matrix to solve the linear system.
3x – 7y = -16
-2x + 4y = 8

45. You MAY use a CALCULATOR!
20 points - Answer
You MAY use a CALCULATOR!
Use an inverse matrix to solve the linear system
3x – 7y = -16
-2x + 4y = 8

46. 2x + 3y = -8 x + 2y = -3 30 points You MAY use a CALCULATOR!
Use an inverse matrix to solve the linear system.
2x + 3y = -8
x + 2y = -3

47. You MAY use a CALCULATOR!
30 points - Answer
You MAY use a CALCULATOR!
Use an inverse matrix to solve the linear system.
2x + 3y = -8
x + 2y = -3

48. 40 points
Skating Party - Your planning a birthday party for your younger brother at a skating rink. The cost of admission is $3.50 per adult and $2.25 per child, and there is a limit of 20 people. You have $50 to spend. Use an inverse matrix to determine how many adults and how many children you can invite.

49. 40 points - Answer
Skating Party - Your planning a birthday party for your younger brother at a skating rink. The cost of admission is $3.50 per adult and $2.25 per child, and there is a limit of 20 people. You have $50 to spend. Use an inverse matrix to determine how many adults and how many children you can invite.

50. 50 points
Stock Investment – You have $9000 to invest in three Internet companies listed on the stock market. You expect the annual returns for companies A, B, and C to be 10%, 9%, and 6%, respectively. You want the combined investment in companies B and C to be twice that of company A. How much should you invest in each company to obtain an average return of 8%?

51. 50 points - Answer
Stock Investment – You have $9000 to invest in three Internet companies listed on the stock market. You expect the annual returns for companies A, B, and C to be 10%, 9%, and 6%, respectively. You want the combined investment in companies B and C to be twice that of company A. How much should you invest in each company to obtain an average return of 8%?