3 years ago

Help! Can you answer this question and explain it to me?? It's due TOMORROW!!!!!☹️☹️

1 answer:

6 0

500 +265=765
is answr

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labwork [276]

Answer: On

Step-by-step explanation:

Replace the variables with the coordinate of the point.

3*5 = 6*4-9

15 = 15

3 0

3 years ago

svetoff [14.1K]

Parameterize this surface (call it $S$ ) by

$\vec r(u,v)=u\cos v\,\vec\imath+u\sin v\,\vec\jmath+(9-u^2)\,\vec k$

with $0\le u\le3$ and $0\le v\le2\pi$ . Take the normal vector to $S$ to be

$\vec r_u\times\vec r_v=2u^2\cos v\,\vec\imath+2u^2\sin v\,\vec\jmath+u\,\vec k$

Then the area of $S$ is

$\displaystyle\iint_S\mathrm dA=\iint_S\|\vec r_u\times\vec r_v\|\,\mathrm du\,\mathrm dv$

$=\displaystyle\int_0^{2\pi}\int_0^3u\sqrt{1+4u^2}\,\mathrm du\,\mathrm dv$

$=\displaystyle2\pi\int_0^3u\sqrt{1+4u^2}\,\mathrm du=\boxed{\frac{37\sqrt{37}-1}6\pi}$

3 0

3 years ago

IrinaVladis [17]

The correct answer is D

7 0

3 years ago

mamaluj [8]

(2(3x4))+(2(4x8))+(2(3x8)) = 24+64+48 = 136

Answer: C

7 0

3 years ago

Y_Kistochka [10]

31.9
hope this helps

3 0

3 years ago