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2 years ago

Karen made 40 cakes

1 answer:

3 0

1. You have that Karen made 40 cakes and she gives 1/5 to Andrew and 10% to Chris, then you have:

40 cakes=5/5=1
1/5 to Andrew⇒40x1/5=8
10% to Chris=40x0.10=4

1/5----8
x----4

x=4(1/5)/8
x=1/10

2. The fraction of the 40 cakes that she have left is:

1-1/5-1/10

Therefore, the answer is: 7/10

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3 years ago

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$\dfrac{\mathrm dV}{\mathrm dt}=2\pi rh\dfrac{\mathrm dt}{\mathrm dt}$

which is to say, $\dfrac{\mathrm dV}{\mathrm dt}$ and $\dfrac{\mathrm dr}{\mathrm dt}$ are directly proportional by a factor equivalent to the lateral surface area of the cylinder ( $2\pi r h$ ).

Meanwhile, if the cylinder's radius is kept fixed, then

$\dfrac{\mathrm dV}{\mathrm dt}=\pi r^2\dfrac{\mathrm dh}{\mathrm dt}$

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just olya [345]

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