Solve the differential equation.D2y - 9 Dy = 0
A. y = C1e9x + C2ex
B. y = C1e9x + C2
C. y = C1e-9x + C2
D. y = C1e-9x + C2ex
Answer: B
Mathematics
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Find the exact value of the expression. 
+ 
A. 
B. 10?
C. 
D. 
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Factor.15x2 - 9x + 20x - 12
A. (15x - 4)(x + 3) B. (3x - 4)(5x + 3) C. (3x + 4)(5x - 3) D. (15x + 4)(x - 3)
Mathematics
Add or subtract.4
+ 17
A. 14
B. 21
C. -13
D. -22
Mathematics
Solve the system of differential equations.
= 3x1 - 2x2
= x1
A. x1 = C1e2t + 2C2et x2 = C1et + 2C2e2t B. x1 = C1et + 2C2e2t x2 = C1e2t + 2C2et C. x1 = C1e2t + 2C2e2t x2 = C1e2t + 2C2e2t D. x1 = C1et + 2C2e2t x2 = C1et + 2C2e2t
Mathematics