Find the velocity vector in terms of ur and u?.r = 2 cos 4t and ? = 2t
A. v = (-4 sin 4t)ur + 4cos 4tu?
B. v = (-4 sin 2t)ur + 8cos 2tu?
C. v = (-8 sin 4t)ur + 4cos 4tu?
D. v = (8 sin 4t)ur + 4cos 4tu?
Answer: C
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A. Differentiable B. Continuous but not differentiable C. Neither continuous nor differentiable
Determine whether the complex number is a solution of the equation.8i;y2 + 64 = 0
A. Yes B. No
Solve the problem.Assume that the annual sales of a small manufacturer can be modeled by a linear function and that sales were $11,500 in 1982 and $80,000 in 1987. Let x = 0 represent 1982 and f(x) represent annual sales, and write a formula for f(x).
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Solve the problem.A chemical solution contains 6% lead. How much lead is in 
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