Evaluate the 2 × 2 determinant.
A. 68
B. -34
C. 44
D. -44
Answer: C
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The position vector of a particle is r(t). Find the requested vector.The velocity at t = 0 for r(t) = cos(2t)i + 2ln(t - 7)j - 
k
A. v(0) = -2i - 
j
B. v(0) = -
j
C. v(0) = 
j
D. v(0) = 2i - 
j
Solve the problem.The radius of a circle is 
in. Find its circumference.
A. 
? in
B. 
? in
C. 
? in
D. 
? in
Graph the function.f(x) = 
x - 3
A. 
B. 
C. 
D. 
Solve the problem.The consumption of electricity can be modeled by C = Aert, where A is the current use, r is the rate at which the use is increasing, and t is the number of years. Suppose the consumption of electricity grows at 6.8% per year. Find the number of years before the use of electricity has tripled. Round the answer to the nearest hundredth.
A. 0.16 year B. 1.62 years C. 16.16 years D. 44.12 years