= 
A. 72
B. 17
C. 58
D. 63
Answer: A
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For the curve r(t), find an equation for the indicated plane at the given value of t.r(t) = (t - 6)i + (ln(sec t) - 3)j + 9k, -?/2 < t < ?/2; normal plane at t = 2?.
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Solve the problem.A wheel with radius 2 m rolls at 13 rad/s. How fast is a point on the rim of the wheel rising when the point is 
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List the elements in the set .Let U = {q, r, s, t, u, v, w, x, y, z} A = {q, s, u, w, y} B = {q, s, y, z} C = {v, w, x, y, z}. B ? (A - C)
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Solve the problem.The population of a town was 34,600 at the beginning of 1970. If the population decreased 400 people per year, how many people lived in the town at the beginning of 1985?
A. 28,200 people B. 6000 people C. 29,000 people D. 28,600 people