2 years ago

Please help me!!!! Super confused

Mathematics

1 answer:

valkas [14]2 years ago

4 0

The correct answer to 38 is B

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3 years ago

webassign If a snowball melts so that its surface area decreases at a rate of 6 cm2/min, find the rate at which the diameter dec

drek231 [11]

Answer:

The answer is $\frac{3}{10\pi } cm/min$

Step-by-step explanation:

Assuming the snowball is a perfect sphere, then if A denotes the surface area and D the diameter then:

$A=4\pi r^{2} = 4\pi (\frac{D}{2} )^{2} =\pi D^{2}$

Differentiating wrt r we have:

$\frac{dA}{dD} =2\pi D$

We are told that $\frac{dA}{dt}= -6$ and we want to find $\frac{dD}{dt}$

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$\frac{dA}{dD}=\frac{dA}{dt}.\frac{dt}{dD}=\frac{\frac{dA}{dt} }{\frac{dD}{dt} }$

∴ $2\pi D=-\frac{6}{\frac{dD}{dt} }$

∴ $\frac{dD}{dt}=-\frac{6}{2\pi D}$

When D=10 then

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The sign (-) shows that the D is decreasing.

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3 years ago

Gabriella bought 8 chicken wings for $4. What was the cost of the wings in wings per dollar?

Dmitriy789 [7]

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2 wings/dollar

Step-by-step explanation:

The unit cost is $4 / 8 wings, or $0.50/wing. This is equivalent to 2 wings/dollar.

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2 years ago

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boom I hope this was the right thing

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i went on your profile thing yep

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