If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (6 ln(2t))i + (7t3)j
A. a = - 3t-2i + 42tj
B. a = 
t-2i + 42tj
C. a = - 
i + 42tj
D. a = 
i + 21tj
Answer: C
Mathematics
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A. 
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D. 
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Solve the equation.0.05y + 0.09(700 - y) = 0.21y
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