BIGJAYWESTSIDE

03.07.2019 • 

Mathematics

Atornado is formed when a tube of air circling a horizontal axis is tilted up vertically by the updraft from a thunderstorm. if t is time, this process can be modeled by the wind velocity field f (t, x, y, z) = (cos t j + sin t k ) × r and 0 ≤ t ≤ π 2 . (a) rewrite f (t, x, y, z) by computing the cross-product. f (t, x, y, z) = ⟨zcos(t)−ysin(t), xsin(t), −xcos(t)⟩ (b) find curl f = ⟨0,2cos(t),2sin(t)⟩ (c) determine the direction of curl f under the following conditions. at t = 0 , curl f is horizontal , and pointing in the direction. for 0 < t < π 2 , curl f is parallel to the -plane, and making an angle of t radians

Ответ:

ayowazzzgood

24.07.2021

Mathematics

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An = a1 + (n - 1) * d
n = term u want to find = 20
a1 = first term = 10
d = common difference = 4
now we sub
a20 = 10 + (20 - 1) * 4
a20 = 10 + 19 * 4
a20 = 10 + 76
a20 = 86 <== there r 86 seats in the 20th row

an = 10 + (n-1) * 4 is ur equationand whatever row u want to find out how many seats are on, just sub in for n.

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