Solve the triangle. Round side lengths and angle measures to the nearest tenth when necessary. 
A. a ? 7.3, B ? 7.8°, C ? 142.2°
B. a ? 8.3, B ? 2.8°, C ? 147.2°
C. a ? 8.3, B ? 6.9°, C ? 143.1°
D. a ? 7.3, B ? 7.8°, C ? 37.8°
Answer: A
Mathematics
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A. (0, 7) B. (9, -7) C. (-7, 0) D. (0, -7)
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Use the method of undetermined coefficients to solve the differential equation.y'' + 6y' + 9y = 2e-x
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