The half life of P(t)=2e^0.3t os twice the half life of Q(t) = e^-0.6t True of False? please explain why I need to learn this for our test tomorrow. Thanks ! much appreciated

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Consider the following vector function.
r(t) = 7(t^2) , sin t − t cos t, cos t + t sin t
t>0?
Can you answer this for me? I'm so lost!?
Determine whether the given lines intersect, are skew, or are parallel. If they intersect, determine the point of intersection.?
Rewrite this measurement with a simpler unit, if possible. 9.1 kg*m^2/m*s^2?
Where does freezing water get its energy from?