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3 years ago

The mean of a particular set of 7 numbers is 4. Six of the numbers in the set are known: 1,2,2,5,7,and 8.

Mathematics

1 answer:

Setler [38]3 years ago

8 0

$\dfrac{1+2+2+5+7+8+x}{7}=4\\
\dfrac{25+x}{7}=4\\
25+x=28\\
\boxed{x=3}
$

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Answer: t = 5

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3 years ago

What is the acceleration of a plane that increases its speed from 800 kilometers per hour to 860 kilometers per hour in 5 second

gayaneshka [121]

I came up with 43,200 km/h^2

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3 years ago

Help and please explain!

UkoKoshka [18]

Answer:

a. 146

Step-by-step explanation:

{4*[72-6*(3+2)]}-22

=[4*(72-6*5)]-22

=[4*(72-30)]-22

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3 years ago

A person on the ground looks up at an angle of 28° and sees the top of a tree and the top of a building aligned. The tree is 20

lorasvet [3.4K]

Answer:

21.27 meters.

Step-by-step explanation:

Please find the attachment.

Let H and h represent height of building and tree respectively.

We have been given that a person on the ground looks up at an angle of 28° and sees the top of a tree and the top of a building aligned. The tree is 20 m away from the person and the building is 60 m away from the person.

We know that tangent relates opposite side of a right triangle with its adjacent side.

$\text{tan}=\frac{\text{Opposite}}{\text{Adjacent}}$

$\text{tan}(28^{\circ})=\frac{H}{60}$

$60\cdot \text{tan}(28^{\circ})=H$

$60\cdot 0.531709431661=H$

$H=31.90256589966\approx 31.90$

Similarly, we can find height of the tree.

$\text{tan}(28^{\circ})=\frac{h}{20}$

$20\cdot\text{tan}(28^{\circ})=h$

$20\cdot 0.531709431661=h$

$h=10.63418863322\approx 10.63$

$H-h=31.90-10.63$

$H-h=21.27$

Therefore, the difference in heights between the building and tree is 21.27 meters.

3 0

3 years ago

Find the perimeter of the quadrant whose radius is 28cm

Alenkasestr [34]

Answer:

$\huge \boxed{\mathrm{99.98 \ cm}}$

Step-by-step explanation:

A quadrant is quarter of a circle.

The perimeter of a quarter of a circle is $\frac{2\pi r}{4} +2r$ .

The radius $r$ is 28 cm.

$\frac{2\pi (28)}{4} +2(28)= 99.982297...$

The perimeter of the quadrant with radius 28 cm is approximately 99.98 cm.

5 0

3 years ago

Read 2 more answers