What is the determinant of ?

What is the area of a triangle with vertices at (–2, –1), (4, –1), (6, 5)?
Which expression represents the determinant of ?

Given the system , which is true?

What is the area of a parallelogram formed by = and = ?

What is the determinant of ?

What is the volume of the parallelepiped determined by the vectors a = , b = , and c = ?
Which expression represents the determinant of ?

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