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Flauer [41]
3 years ago
11

The radius of a right circular cone is increasing at a rate of 1.4 in/s while its height is decreasing at a rate of 2.8 in/s. At

what rate is the volume of the cone changing when the radius is 138 in. and the height is 143 in.?
Mathematics
1 answer:
zepelin [54]3 years ago
7 0

Answer:

34191.7πin³/sec

Step-by-step explanation:

Volume of circular come = 1/3pi x r² x h

When we differentiate this formula we have

dv/dt = 1/3π[r²dh/dt + 2rhdr/dt]

We have the following information

r = 138

H = 143 inch

dr/dt = 1.4

dh/dt = -2.8

When we plug into the formula

1/3π[130² x -2.8 + 2x138x143x1.4]

= 34191.7πin³/sec

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dybincka [34]

Answer:

They are only equal on day 0, both having 10 population.

Step-by-step explanation:

Given the bacteria on the counter is initially measured at 5 and doubles every 3 days we can generate the following geometric equation:

f(x)=10*2^{\frac{x}{3} }

Given the bacteria on the stove is measured at 10 and doubles every 4 days we can create another equation:

f(x)=10*2^{\frac{x}{4} }

To find how many days it will take for the bacteria population to equal the same lets set both equations equal to eachother:

10*2^{x/3}=10*2^{x/4}

Divide both sides by 10

2^{x/3}=2^{x/4}

Since both exponents have the same base we can set the exponents equal to eachother and solve for x:

\frac{x}{3}=\frac{x}{4}

Multiply both sides by 3 to isolate x on the left side

x=\frac{3x}{4}

Multiply both sides by 4 to remove fraction

4x=3x

Subtract 3x to isolate x on the left side

x=0

Plug x into one of our original equations

f(0)=10*2^{0/3}

Solve

f(0)=10

6 0
2 years ago
What is the correct method to label a line with point U and W on it
Anuta_ua [19.1K]

Answer:

The answer is B.

Step-by-step explanation:

7 0
2 years ago
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Step-by-step explanation:

4 0
3 years ago
Instructions: Find the value of the trigonometric ratio. Make sure to simplify the fraction if
enyata [817]

Answer:

cosC = \frac{7}{25}

Step-by-step explanation:

cosC = \frac{adjacent}{hypotenuse} = \frac{BC}{AB} = \frac{7}{25}

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Answer:

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Step-by-step explanation:

∫udv = uv - ∫vdu

u = ln x and dv = 7x^2dx so,

du = 1/x and v = 7x^3/3 so:

∫7x^2 ln x = (7x^3/3) ln x - 7 ∫x^3/3 * 1/x dx

                 = 7/3 x^3 ln x - 7 ∫x^2/3 dx

                 = 7/3 x^3 ln x - 7/x^3/2 * 1/3 dx

                 = 7/3 x^3 ln x - 7/9 x^3 + c.

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1 year ago
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