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3 years ago

Need help please like now please

Mathematics

2 answers:

Kipish [7]3 years ago

3 0

The answer would be D because 100 Centimeters equal 1 meter so therefore it would be 200 day's of knitting

9966 [12]3 years ago

3 0

Well there is 100 centimeters in 1 meter so if she were to do One meter each day till she got to two meters it would take her 20 days

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Alex777 [14]

The answer should be D.

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3 years ago

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DerKrebs [107]

a. Parameterize $C$ by

$\vec r(t)=(1-t)(5\,\vec\imath)+t(2\,\vec\jmath)=(5-5t)\,\vec\imath+2t\,\vec\jmath$

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$\displaystyle\int_C\vec F(x,y)\cdot\mathrm d\vec r=\int_0^1\vec F(x(t),y(t))\cdot\frac{\mathrm d\vec r(t)}{\mathrm dt}\,\mathrm dt$

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$=\displaystyle\int_0^1(10t+(10-10t))\,\mathrm dt$

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d. Notice that we can write the line integral as

$\displaystyle\int_C\vecF\cdot\mathrm d\vec r=\int_C(-y\,\mathrm dx+x\,\mathrm dy)$

By Green's theorem, the line integral is equivalent to

$\displaystyle\iint_D\left(\frac{\partial x}{\partial x}-\frac{\partial(-y)}{\partial y}\right)\,\mathrm dx\,\mathrm dy=2\iint_D\mathrm dx\,\mathrm dy$

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natita [175]

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PIT_PIT [208]

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