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Criado por Elexali Olayvar
mais de 3 anos atrás
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Joanne bought 3 baseball cards for $160. If the first card was as expensive as the combined price of the second and the third cards, and the second card cost $20 more than the third card, what is the price of the first card?
A.
80
B.
50
C.
100
D.
60
The commutative property holds for the _____
of two matrices but does not hold for the______
of two matrices.
Which statement about inverse matrices is true?
A.
An inverse matrix is always a square matrix.
B.
An inverse matrix is never a square matrix.
C.
The determinant of an inverse matrix is always zero.
D.
There always exists a square matrix A-1 for which AA-1 = l.
