Linda invests $3000 In a bond that pays 8% interest compounded monthly. Her friend lyla invests $3000 in a certificate of deposi
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Given the position function, the velocity function is obtained by taking the derivative:
The velocity is increasing its own derivative is positive, so we also have to find the acceleration by taking another derivative:
To find when , we first need to know where
:
The quadratic factor is always positive (its discriminant is negative), which leaves one solution at . To either side of
, we have, for instance,
which indicates that is increasing for
, making the answer A.