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1 year ago

Select all the equations that are true, and you can only pick 3...

Mathematics

1 answer:

lesya [120]1 year ago

5 0

Answer:

I only see one true equation. Please check the statements.

Step-by-step explanation:

О 0+451=0← for A FALSE

О 130+210=210+130← for B FALSE

О (123+57)+180=180+(87+180)←for C FALSE

√ for= 497+0=497←for D TRUE

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a circle has a radius of 4 an arc in this circle has a central angle of 288 what is the length of the arc

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Answer:

20.1 units

Step-by-step explanation:

2πr * X/360, where X = angle measure

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20.1 units

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3 years ago

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3 years ago

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2 years ago

The diameter and height of a right circular cylinder are found at a certain instant to be 10 centimeters and 20 centimeters, res

Andrej [43]

Answer:

Step-by-step explanation:

Here's the formula for the volume of a right circular cylinder:

$V=\pi r^2h$

Here's what we are given and what we need to find:

Given that d = 10 cm, h = 20 cm, dd/dt = 1 cm/sec

Need to find dh/dt when V is constant

Since our formula has a radius in it and not a diameter but the info given is a diameter, we can use the substitution that

$2r =d$ so

$r=\frac{1}{2}d$

Now we can rewrite the formula in terms of diameter:

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Now we will take the derivative of this equation with respect to time using the product rule. That derivative is

$\frac{dV}{dt}=\frac{\pi }{4}[d^2*\frac{dh}{dt}+2d\frac{dd}{dt}*h]$

Now we can fill in our values. Keep in mind that if the volume is constant, there is no change in the volume, so dV/dt = 0.

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$0=\frac{\pi }{4}(100\frac{dh}{dt}+400)$

Multiply both sides by pi/4 to get

$0=100\frac{dh}{dt}+400$ and solve for dh/dt:

$-4=\frac{dh}{dt}$

Interpreted within the context of our problem, this means that the volume will be constant at those given values of diameter and height when the liquid in the cylinder is dropping at a rate of 4 cm/sec.

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3 years ago

Need help will give you the brainliest

Alja [10]

Answer:

<BDC and

<CDB but be sure and read what is below.

Step-by-step explanation:

The trick is to put the letter for the angle in the middle of its 3 letter name.

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You have named it in 2 different ways. The letters on either end don't matter as much as having D in the middle.

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2 years ago