Use a product-to-sum identity to rewrite the expression.cos(16k) cos (4k)
A. 0.5(sin(12k) + sin(20k))
B. 0.5(cos(12k) + cos(20k))
C. 0.5(sin(12k) - sin(20k))
D. 0.5(cos(12k) - cos(20k))
Answer: B
Mathematics
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Evaluate the improper integral or state that it is divergent.
A. ln 6
B. 
C. Divergent
D. ln 8
Mathematics
Perform the indicated operation.8.4 kg + 5.4 kg
A. 13.8 kg B. 30 kg C. 138 kg D. 3 kg
Mathematics
Solve the rational inequality. Express your solution on a number line using interval notation.
> 0
A. (-8, 2)
B. (-?, -8) or (2, ?)
C. (2, ?)
D. (-?, -8)
Mathematics
Solve the problem.Technology matrix A, representing interindustry demand, and matrix D, representing consumer demand for the sectors in a three-sector economy, are given. Use the matrix equation 
to find the production level X that will satisfy both demands.A = 
, D = 
A.
X = 
B.
X = 
C.
X = 
D.
X = 
Mathematics