Simplify.
A. 
B. 
C. 
D. 
Answer: B
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (5t - 4t3)i + 2tan(3t)j + e4tk
A. a
= 2?i + 72j + 16e1/3?k
B. a
= - 2?i + 72j + 16e1/3?k
C. a
= - 2?i - 72j + 16e1/3?k
D. a
= - 2?i - 72j + 16k
Complete the following table.?RiseRunPitch(a)4 ft12 ft?(b)?36 ft3:12(c)9 ft?4:12(d)11 ft 3 in.20 ft?(e)8 ft30 ft?(f)?45 ft1.6:12(g)5 ft?2.5:12(h)?18 ft 4 in.3:12Note: Roofers usually express pitch with a denominator of 12.
What will be an ideal response?
Write in exponential form:
Solve the problem.Suppose, for a certain drug, the following results were obtained: Immediately after the drug was administered, the concentration was 10 milligrams per milliliter. Eleven hours later, the concentration had dropped to 2.1 milligrams per milliliter. The concentration decays exponentially according to the law 
Determine the value of k for this drug.
A. k = -0.1419 B. k = 0.1419 C. k = -0.8161 D. k = -0.0067