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Charra [1.4K]
3 years ago
11

The number of people, n, who know a rumor can be modeled using the equation n(*)=20(2)*, where * is the number of days since Mon

day. (A) Explain why n(0)=20. What does this represent in terms of the situation modeled? (B) What is the value of n(-2)? What does represent in the situation modeled?
Mathematics
1 answer:
galben [10]3 years ago
6 0
U need n = 2 6 hope this help u nedd 62626wnesslln
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1.6(10^2) is what I got but I guess I don’t fully know
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G verify that the divergence theorem is true for the vector field f on the region
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\displaystyle\iiint_E\nabla\cdot\mathbf f(x,y,z)\,\mathrm dV=\int_{\varphi=0}^{\varphi=\pi}\int_{\theta=0}^{\theta=2\pi}\int_{\rho=0}^{\rho=6}\rho^2\sin\varphi\,\mathrm d\rho\,\mathrm d\theta\,\mathrm d\varphi=288\pi

On the other hand, we can parameterize the boundary of E by

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\mathrm d\mathbf S=\mathbf n\,\mathrm dS=\dfrac{\mathbf s_v\times\mathbf s_u}{\|\mathbf s_v\times\mathbf s_u\|}\|\mathbf s_v\times\mathbf s_u\|\,\mathrm du\,\mathrm dv
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\displaystyle\iint_{\partial E}\mathbf f\cdot\mathrm d\mathbf S=36\int_{v=0}^{v=\pi}\int_{u=0}^{u=2\pi}\mathbf f(x(u,v),y(u,v),z(u,v))\cdot(\mathbf s_v\times\mathbf s_u)\,\mathrm du\,\mathrm dv
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as required.
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The first answer is correct

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