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Aleks04 [339]
4 years ago
10

A cylinder has volume 78 cm³. What is the volume of a cone with the same radius and height?​

Mathematics
1 answer:
OleMash [197]4 years ago
6 0

Answer:

The volume of the cone is 26\ cm^{3}

Step-by-step explanation:

we know that

The volume of a cylinder is equal to

V=\pi r^{2}h

In this problem we have that

V=78\ cm^{3}

so

78=\pi r^{2}h -----> equation A

The volume of a cone with the same radius and height is equal to

V=\frac{1}{3}(\pi r^{2}h) -----> equation B

Substitute equation A in equation B

V=\frac{1}{3}(78)

V=26\ cm^{3}

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The amount of rainfall in january in a certain city is normally distributed with a mean of 4.3 inches and a standard deviation o
Sholpan [36]
We start by showing the position of the first quartile, Q1 on the normal distribution graph. Q1 happens at 25% of the data.

The graph is shown below

We are interested in the area to the left of Q1 and we know that the probability is 0.25

We can find out the value of z-score from the table as shown below 

The z-score when p=0.25 is 0.68

then changing this z-score into the actual value

-0.68= \frac{X-4.3}{0.3}
-0.204=X-4.3
X=4.096

7 0
4 years ago
Sketch a graph of the polynomial function f(x) = –x3 + 5x2 – 2x – 8. Use the graph to complete the following:
Darya [45]

Answer:

decreasing

Step-by-step explanation:

If you put the function in desmos, everything up until -1 is decresaing still.

7 0
3 years ago
I need help on this final problem​
bulgar [2K]

Answer:

1/2 (1 - 10 d)

Hope This Helps & Good Luck ^^

8 0
3 years ago
X/5=1/(x+4) solve for x
solmaris [256]

ANSWER:

X is -5 and 1.

1) cross multiply

2) subtract five from both sides

3) factor

4) check for extraneous

5) ask me if you are still confused.

6 0
3 years ago
Mr. Acosta, a sociologist, is doing a study to see if there is a relationship between the age of a young adult (18 to 35 years o
Alik [6]

Answer:

There is a relationship between the age of a young adult and the type of movie preferred.

Step-by-step explanation:

In this case we need to test whether there is a significance relationship between the age of a young adult and the type of movie preferred.

The hypothesis can be defined as:

<em>H₀</em>: Age of a young adult and movie preference are independent.

<em>Hₐ</em>: Age of a young adult and movie preference are not independent.

The test statistic is given as follows:

\chi^{2}=\sum\limits^{n}_{i=1}{\frac{(O_{i}-E_{i})^{2}}{E_{i}}}

Consider the table below.

The formula to compute the expected frequencies is:

E_{i}=\frac{\text{Row Total}\times \text{Column Total}}{\text{Total}}

The Chi-square test statistic value is:

\chi^{2}=\sum\limits^{n}_{i=1}{\frac{(O_{i}-E_{i})^{2}}{E_{i}}}=2.6013

The significance level of the test is, <em>α</em> = 0.05.

The degrees of freedom of the test is,

df = (r - 1)(c - 1)

   = (3 - 1)(3 - 1)

   = 2 × 2

   = 4

Compute the <em>p</em>-value as follows:

<em>p</em>-value = 0.6266

*Use a Chi square table.

As the <em>p-</em>value is more than the significance level the null hypothesis was failed to be rejected.

Thus, concluding that there is a relationship between the age of a young adult (18 to 35 years old) and the type of movie preferred.

5 0
3 years ago
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