The position vector of a particle is r(t). Find the requested vector.The velocity at t = 0 for r(t) = cos(4t)i + 3ln(t - 7)j - 
k
A. v(0) = 
j
B. v(0) = -4i - 
j
C. v(0) = 4i - 
j
D. v(0) = -
j
Answer: D
Mathematics
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Multiply.
A. - 
B. 
C. - 
D. - 
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Solve the problem.It costs $900 to start up a business of selling hot dogs. Each hot dog costs 
to produce. Let y be the cost in dollars of producing x hot dogs. Write the cost equation.
A. y = .55x - 900 B. y = .55x + 900 C. y = 900x + .55 D. y = 55x + 900
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Divide.(x4 + 81) ÷ (x - 3)
A. x3 + 3x2 + 9x + 27 + 
B. x3 + 3x2 + 9x + 27
C. x3 - 3x2 + 9x - 27 + 
D. x3 + 3x2 + 9x + 27 + 
Mathematics
Use the given matrices to compute the given expression.Let B = 
. Find -2B.
A. 
B. 
C. 
D. 
Mathematics