PLEASE HELP I GIVE THANKS

1 answer:

3 0

The answer of first one is A, because this is positive.

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Zina [86]

I'm positive that it is one

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kondor19780726 [428]

Answer:

I'm sorry but if your struggling with this iďk what to tell you chief

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Firdavs [7]

$\mathbf r(t)=\langle x(t),y(t),z(t)\rangle=\langle\sin t,\cos t,t\rangle$

$x^2+y^2+z^2=\sin^2t+\cos^2t+t^2=65$
$\implies t^2=64$
$\implies t=\pm8$

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