Number 3 I need help with please

Hi can someone pleasee help?

USPshnik [31]

Answer:

C. 28.26cm^3

Step-by-step explanation:

In tne formula V= (1/3) pi*r^2*h,

r represents the radius of the base and h represents thr height of the cone.

In this diagram, R is the radius of the base and H is the height of the cone.

Therefore, simply substitute the value of R into r and the value of H into h using the given formula and round your answer to two decimal places.

8 0

3 years ago

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Plz help I don't know much about what this question is asking me

Ann [662]

Answer:

B

Step-by-step explanation:

You can see that the only difference between the three questions is the charge of the electrons. Electrons are negatively charged and so the answer is just B

7 0

3 years ago

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There are two machines available for cutting corks intended for use in wine bottles. The first produces corks with diameters tha

vitfil [10]

Answer:

a) $P(2.9$

And we can find this probability with the following difference:

$P(-1$

b) $P(2.9$

And we can find this probability with the following difference:

$P(-3.5$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Part a

Let X the random variable that represent the diameters of a population 1, and for this case we know the distribution for X is given by:

$X \sim N(3,0.1)$

Where $\mu=2$ and $\sigma=0.1$

We are interested on this probability

$P(2.9$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

$z=\frac{x-\mu}{\sigma}$

If we apply this formula to our probability we got this:

$P(2.9$

And we can find this probability with the following difference:

$P(-1$

Part b

$X \sim N(3.04,0.04)$

$P(2.9$

And we can find this probability with the following difference:

$P(-3.5$

4 0

3 years ago

Will somebody please help me

Whitepunk [10]

Answer:

9n-3

Step-by-step explanation:

Let's set up an expression:

2n-1-(-7n+2)

Now we simplify the expression

2n-1+7n-2

Combine like terms

9n-3

5 0

3 years ago

Simplify (4x+5y)(2x-3y)+3xy Help

amid [387]

Answer:

8x² - 15y² + xy

Step-by-step explanation:

(4x + 5y) (2x - 3y) + 3xy

multiplying the terms in brackets

(4x) (2x - 3y) + (5y) (2x - 3y) + 3 xy

multiplying with each terms inside the bracket

(4x)(2x) - (4x) (3y) + (5y) (2x) - (5y) (3y) + 3xy

doing the product each of the pair of terms

8x² - 12xy + 10xy - 15y² + 3xy

taking the sum of terms with coefficient "xy"

8x² - 15y² -2xy + 3xy

8x² - 15y² + xy

3 0

3 years ago