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3 years ago

13

One beaver can chew through a tree that is 15 cm thick and 20 minutes if it works the same paste how long will it take one beave

r to cut down a Knouff trees to create a stack one

1 answer:

siniylev [52]3 years ago

4 0

Answer is 67 or 44 or 4444444

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When the area in square units of an expanding circle is increasing twice as fast as its radius in linear units, the radius is...

enot [183]

Answer:

c. $\frac{1}{\pi}$

Step-by-step explanation:

We have been given that the area in square units of an expanding circle is increasing twice as fast as its radius in linear units

We will use derivatives to solve our given problem.

We know that area (A) of a circle is equal to $A=\pi r^2$ .

Let us find derivative of area function with respect to time.

$\frac{dA}{dt}=\frac{d}{dt}(\pi r^2)$

Bring out constant:

$\frac{dA}{dt}=\pi \frac{d}{dt}(r^2)$

Using power rule and chain rule, we will get:

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

$\frac{dA}{dt}=2\pi r*\frac{dr}{dt}$ Here $\frac{dr}{dt}$ represents change is radius with respect to time.

We have been given that area of an expanding circle is increasing twice as fast as its radius in linear units. We can represent this information in an equation as:

$\frac{dA}{dt}=2\frac{dr}{dt}$

$2\pi r* \frac{dr}{dt}=2\frac{dr}{dt}$

$2\pi r=2$

$\frac{2\pi r}{2\pi}=\frac{2}{2\pi}$

$r=\frac{1}{\pi}$

Therefore, the radius is $\frac{1}{\pi}$ and option 'c' is the correct choice.

6 0

3 years ago

What is 2+2+2-2+4-8?

bogdanovich [222]

Answer:

Answer- 0

Step-by-step explanation:

2+2+2-2+4-8= 4-2+4-8=0

hope this helps :)

3 0

3 years ago

Read 2 more answers

A cone has a volume of 6 cubic inches. What is the volume of a cylinder that the cone fits exactly inside of?

solmaris [256]

Formula for calculating volume of a cone is:

V = B*H/3

Formula for calculating volume of cylinder is:
V2 = B2*H2

because our cone fits exactly inside cylinder that means that their bases are the same and heights are the same. From this we can conclude (observing formulas for each volume) that cone has 3x less volume than our cylinder.

Cylinder volume is 6*3 = 18 in^3

6 0

3 years ago

What is the answer to this 3-(|-4|-|-5|)

Sholpan [36]

60 because all the negatives would cancel out so all you have to do is multiply the numbers

7 0

3 years ago

Please help I have another question with the same criteria

kondaur [170]

The answer is 7 because it’s 7

5 0

3 years ago

Read 2 more answers