Solve the equation using an integrating factor., t > 0

A. y = -t-4 + t3 + C
B. y = t-4 + t5
C. y = Ct-4 + t5
D. y = Ct4 + t5

Answer: C

Mathematics

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A. 4860 ft ? lb B. 5700 ft ? lb C. 1060 ft ? lb D. 6600 ft ? lb

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Solve the problem.The position (in centimeters) of an object oscillating up and down at the end of a spring is given by  at time t (in seconds). The value of A is the amplitude of the motion, k is a measure of the stiffness of the spring, and m is the mass of the object. Find the object's acceleration at time t.

A. a = - A sin  cm/sec2
B. a =  cos  cm/sec2
C. a = -  sin  cm/sec2
D. a = - A sin  cm/sec2

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Add or subtract.11 + 

A. 16
B. 4
C. 17
D. 4

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Solve the equation for the specified variable.Solve for b. A = h(B + b)

A. b = 
B. b = 2A - Bh
C. b = 
D. b = 

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Mathematics