Provide an appropriate response.The position of a particle is given by r(t) = sin 2t i + cos 4t j. Find the velocity vector for the particle.
A. 2 sin 2t i + 4 cos 4t j
B. 2 cos 2t i - 4 sin 4t j
C. 2 i + 4 j
D. cos 2t i - sin 4t j
Answer: B
Mathematics
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= 
A. Not an identity B. Identity
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Solve the problem.Suppose that you walk 8 mi. Express this distance in yards.
A. 1408 yd B. 14,080 yd C. 8000 yd D. 800 yd
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Perform the division. Write the answer with positive exponents.
A. 7x2 + 2 + 
B. 7x + 2 + 
C. 7x + 2 + 
D. 7x2 + 2 + 
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Find the exact value of the expression if ? = 45°. Do not use a calculator.f(?) = cos ?Find 
.
A. 
B. 10
C. 
D. 
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