Solve the problem.The position(in feet) 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 velocity at time t.
A. v = - A
cos 
ft/sec
B. v = A
cos 
ft/sec
C. v = A
cos 
ft/sec
D. v = A cos 
ft/sec
Answer: B
Mathematics
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A. 4.35 B. -2.265 C. 2.265 D. -4.35
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Perform the indicated operations and simplify the result. Leave the numerator and denominator in your answer in factored form.
A. 
B. 
C. 
D. 
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A. 2(-5 + x) + 2(9x + 4); 20x - 6 B. 2x - 5 + 2(9 + 4x); 10x + 20 C. 2(-5 + x) + 2(9 + 4x); 6x + 8 D. 2(9x + 4) - [2x + (-5)]; 16x + 13
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