Solve the system using Cramer's Rule. If D = 0, use another method to complete the solution.0.9x + 0.4y = 2.9  x - 0.9y = -3.5

A. ?
B. {(5, 1)}
C. {(1, 5)}
D. {(0.1, 0.5)}


Answer: C

Mathematics

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2x²+4x+7= 0

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Solve the problem.An auditorium has 15 rows with 10 seats in the first row, 12 in the second row, 14 in the third row, and so on. How many seats are in the auditorium?

A. 255 seats B. 390 seats C. 360 seats D. 300 seats

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Simplify.

A.
B.
C.
D.

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Graph the level curves in the first octant at heights of   and  for the given equation.5x + 3y + z = 30 

A.

B.

C.

D.

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