3 years ago

Please answer as soon as possible!!! Will give brainlyest!!!!!!!!!!!

Mathematics

1 answer:

8_murik_8 [283]3 years ago

3 0

The correct answer is C.

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Answer:

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Step-by-step explanation:

Markus has 18 marbles and 3 bags

If you divide 18 marbles by 3 bags that would be 6 marbles in each bag.

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Let A(t) be the area of a circle with radius r(t), at time t in min. Suppose the radius is changing at the rate of drdt=6 ft/min

mylen [45]

Answer:

The rate of change is $108\pi$ ft^(2)/min

Step-by-step explanation:

The area of a circle is given by the following equation:

$A(t) = \pi r^{2}$

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$\frac{dA(t)}{dt} = 2\pi r \frac{dr}{dt}$

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$\frac{dr}{dt} = 6, r = 9$ .

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$\frac{dA(t)}{dt} = 2\pi*9*6$

$\frac{dA}{dt} = 108\pi$

Since the area is in square feet, the rate of change is in ft^(2)/min.

So the rate of change is $108\pi$ ft^(2)/min

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