Use the method of undetermined coefficients to solve the differential equation.2
+ 11
+ 12y = -3x
A. y = c1e-4x + c2e-3x/2 - 
- 
x
B. y = c1e4x + c2e3x/2 + 
- 
x
C. y = c1e-4x + c2e-3x/2 + 
+ 
x
D. y = c1e-4x + c2e-3x/2 + 
- 
x
Answer: D
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Solve the problem.Find the mass of the solid in the first octant between the spheres 
and 
if the density at any point is inversely proportional to its distance from the origin.
A. 15k?
B. 
k?
C. 
k?
D. 90k?
When a firm creates value for customers by performing activities that its competitors can't perform, the firm is said to possess
A. a good reputation B. positive return for shareholders C. a competitive advantage D. intangible values
Solve the equation by factoring.15x2 - 4x = 0
A. {0}
B. 
C. 
D. 
Add or subtract, as indicated.(r3 - 8rs + 6s2) - (6r3 + rs - 4s2)
A. -5r3 - 7rs + 10s2 B. -5r3 - 9rs + 10s2 C. -5r3 - 9rs + 2s2 D. -6r3 - 8rs + 2s2