Multiply or divide. Simplify, if necessary.

A. 56 lb 2 oz
B. 3 lb 5 oz
C. 3 lb 9 oz
D. 56 lb 9 oz

Answer: C

Mathematics

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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) = (4 cos t)i + (3 sin t)j

A. a = (4 cos t)i + (3 sin t)j B. a = (-4 sin t)i + (-3 cos t)j C. a = (-4 cos t)i + (-3 sin t)j D. a = (4 sin t)i + (3 cos t)j

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Mathematics

Solve the problem.The concentration of a certain drug in the bloodstream t minutes after swallowing a pill containing the drug can be approximated using the equation where C(t) is the concentration in arbitrary units and t is in minutes. Find the rate of change of concentration with respect to time at minutes.