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3 years ago

The area of circle 200mm is diameter approximately how many times greater the the are of a circle40mm in diameter

Mathematics

1 answer:

umka21 [38]3 years ago

7 0

Answer:

The area of a circle is pi times radius squared. So the area is proportional to radius squared. 200/40 = 5, and 5 squared = 25.

Step-by-step explanation:

pls give me thanks and brainliest

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seraphim [82]

Answer:

Step-by-step explanation: It is 1/2 of 14 = 7 hours to the moot

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3 years ago

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kompoz [17]

$f_{X,Y,Z}(x,y,z)=\begin{cases}Ce^{-(0.5x+0.2y+0.1z)}&\text{for }x\ge0,y\ge0,z\ge0\\0&\text{otherwise}\end{cases}$

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$\displaystyle\int_0^\infty\int_0^\infty\int_0^\infty f_{X,Y,Z}(x,y,z)\,\mathrm dx\,\mathrm dy\,\mathrm dz=100C=1\implies \boxed{C=0.01}$

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$f_{X,Y}(x,y)=\displaystyle\int_0^\infty f_{X,Y,Z}(x,y,z)\,\mathrm dz=0.01e^{-(0.5x+0.2y)}\int_0^\infty e^{-0.1z}\,\mathrm dz$

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c. This probability can be found by simply integrating the joint density:

$\displaystyle P(X\le1.375,Y\le1.5,Z\le1)=\int_0^1\int_0^{1.5}\int_0^{1.375}f_{X,Y,Z}(x,y,z)\,\mathrm dx\,\mathrm dy\,\mathrm dz$

$\approx\boxed{0.012262}$

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zavuch27 [327]

I uploaded the answer to a file hosting. Here's link:

tinyurl.com/wpazsebu

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