Pretest

Question 1

Which expression represents the determinant of cap A is equal to the 2 by 2 matrix row 1, 2 3 row 2, 1 9 ?

Revolt · Accepted Answer

C: det times cap A is equal to 2 times 9 minus 1 times 3

Question 2

What is the determinant of cap k is equal to the 2 by 2 matrix row 1, 6 8 row 2, 0 3 ?

Revolt · Accepted Answer

C: 18

Question 3

Which expression represents the determinant of cap A is equal to the 2 by 2 matrix, row 1, column 1, negative 3 column 2, 6 row 2, column 1, 1 column 2, negative 6 ?

Revolt · Accepted Answer

B: det times cap A is equal to negative 3 times negative 6 minus 1 times 6

Question 4

Which statement is true for the following system? negative x minus 3 y minus 4 z is equal to 2 negative x plus 2 y minus 4 z is equal to 0 2 x minus y plus 5 z is equal to 1

Revolt · Accepted Answer

B: The system has exactly one solution.

Question 5

What is the area of a triangle with vertices at open paren negative 2 comma negative 1 close paren , open paren 4 comma negative 1 close paren , open paren 6 comma 5 close paren ?

Revolt · Accepted Answer

D: 18  square units

Question 6

What is the determinant of the coefficient matrix of the system? negative x minus y minus z is equal to negative 3 negative x minus y minus z is equal to 8 3 x plus 2 y plus z is equal to 0

Revolt · Accepted Answer

B: 0

Question 7

What is the determinant of cap d is equal to the 2 by 2 matrix, row 1, column 1, negative 4 column 2, 3 row 2, column 1, negative 7 column 2, 6 ?

Revolt · Accepted Answer

C: negative 3

Question 8

Which statement is true for the following system? 4 x minus y plus 2 z is equal to negative 1 negative x plus 2 y plus 5 z is equal to 2 negative x plus y minus 3 z is equal to 1

Revolt · Accepted Answer

B: The system has exactly one solution.

Question 9

What is the determinant of the coefficient matrix of the system? 4 x plus 3 y plus 2 z is equal to 0 negative 3 x plus y plus 5 z is equal to 0 negative x minus 4 y plus 3 z is equal to 0

Revolt · Accepted Answer

A: 130

Question 10

What is the determinant of the coefficient matrix of the system? 4 x minus 6 y plus 0 z is equal to negative 7 3 x plus 3 y plus 0 z is equal to negative 2 2 x minus 12 y plus 0 z is equal to negative 1

Revolt · Accepted Answer

B: 0

Pretest Answers

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