Mathematics Middle School

evaluate the volume of the cone.Use ñ=3.14

Evaluate The Volume Of The Cone.Use =3.14

Answers

Answer 1

The circumference of the base is 40 cm, and this equals 2*pi*r. The radius, r, is found as follows:


40 cm

r = ------------ = 6.369 cm. The area of the base, A = pi*r^2, = 3.14*40.570

2(3.14)


The volume here is V = (1/3)(area of base)*(height)


= (1/3)(127.45)(9) cm^3 = 382.36 cm^3 (answer)



Related Questions

at the park, 4/7 of the children are boys. if there are 8 boys at the park, how many are girls?

Answers

There are 4/7 boys, so there are 3/7 girls.

Let the total number of children be x.

4/7x = 8
1/7x = 8 ÷ 4
1/7x = 2
3/7x = 2 x 3
3/7x = 6

There are 6 girls.
6 because 4/7 boys means a ratio of 4:3, so twice 4 to make 8 means twice 3 to make 6.

Last week 1200 burgers were served at the Burger Barn.

a. This week 1176 burgers were served. What is the percent of change?

b. Use the percent of change from part (a) to predict the number of burgers served next week. Round to the nearest whole number, if necessary.

Answers

a)
[tex]1200 - 1176 = 24[/tex]
24 is the amount of reduction
[tex] \frac{x}{100} = \frac{24}{1200} \\ x = \frac{24\times 100}{1200} = \frac{2400}{1200} = 2[/tex]
so the reduction percentage is 2%
Final answer:

The percent of change between the number of burgers served at the Burger Barn last week versus this week shows a 2% decrease. Using this information, the projected number of burgers to be served next week is approximately 1152.

Explanation:

To calculate the percent of change, we subtract the final number (in this case, the number of burgers served this week) from the initial number (the number of burgers served last week), divide the result by the initial number, and then multiply by 100 to convert to percent.

Percent of Change = ((Initial number - Final number) / Initial number) * 100

So in this case, the percent of change = ((1200 - 1176) / 1200) * 100 = 2% decrease.

To predict the number of burgers served next week, we can assume the same percent of change. If there's a 2% decrease expected, then we subtract 2% of this week's total burgers from this week's total burgers.

Projected number of burgers served next week = This week's total - (2% of This week's total) = 1176 - (2/100 * 1176) = 1152.32 → If we round to the nearest whole number, we get 1152.

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What is the area of the frame in square units around the picture?

Answers

12 x 6s = 72s

8 x 4s = 32s

72s - 32s = 40s

The area of the frame is 40s units^2

I hope this helps!

Solve for x.

−1/4x+5=3/4

Enter your answer in the box.

Answers

the answer for this one is x=17 

Answer:

16

Step-by-step explanation:

this is correct

Paul has a board that is 1,200 cm long. Which of the following measures is equivalent to 1,200 cm?

a. 0.12 km
b. 12 m
c. 120 m
d. 120,000 mm

Answers

1 m =100cm
Therefore 
12m = 1200 cm
answer is B 

Answer:

The correct answer is B.

Step-by-step explanation:

Its B because 1m = 100m

12m = 1,200

Heather has $500 in her savings account. She withdraws $20 per week for gas. Write an equation Heather can use to see how many weeks it will take her to have a balance of $220.

Answers


[tex]500 - 20x = 220[/tex]

Find an angle at home. Measure the angle. Record the measure. Classify the angle.

Answers

find a box and say the angle is 90° and u should be able to figure the other stuff out.

Answer:

a table leg it is 90 degreges from the floor it is a right angle.

Step-by-step explanation:

PLEASE HELP ME! On a coordinate grid, the distance between point F and point G is 13 units. Point F is located at (-1, 3). Point G is located at (x, -9). Which value could be the value of x?

A 4

B 8

C 11

D 24

Answers

cant you just graph it

help with this one plzzz?

Answers

(8x+4)+(18-8x)=8x+4+18-8x=0+22=22
the choice is D

The east room of the White House is 79 feet long by 36 feet wide what is the area and what is the perimeter of the east room

Answers

Hey there!

In area, you multiply the length times the width.

Length = 79 ft.
Width = 36 ft.

79 x 36 = 2,844
The area of the shape is 2,844.

To find perimeter, you add up all the sides. The way you were describing the shape, it sounds like a rectangle so. . .

79 + 79 = 158
36 + 36 = 72
158 + 72 = 230
The perimeter of the room is 230 feet.

Hope this helps you.
Have a great day!

Based on the dimensions of the White House east room, the perimeter must be 230 feet and the area is 2,844 feet.

The measurements of the east room give the impression that this is a rectangular shaped room.

The area of a rectangle is:

= Length x Width

= 79 x 36

= 2,844 feet²

The perimeter is:

= (2 x length) + (2 x Width)

= (2 x 79) + (2 x 36)

= 230 feet

In conclusion, the perimeter of the east room is 230 feet and its area is 2,844 feet².

Find out more at https://brainly.com/question/19848595.

You had $50. You spent 10% of the money on clothes, 20% on games, and the rest on books. How much was spent inborn books?

Answers

Answer:

$35 was spent on books

Step-by-step explanation:

We must figure out the percent out of $50 that the books are worth

This is 70%

Now we need to figure out how much 10% is out of $50

50 divided by 10

10 percent of the books is 5 dollars

Now to find 20% we do 5+5=10 because it is just x2 of 10%

So we have spent 15 dollars on clothes and games

So now all we must do is 50-15=35

This is how we get our answer!

Pls mark me brainliest! Hope this helps :D

After spending 10% on clothes 20% on games I spent $35 on books.

What is the percentage?

A percentage is a value per hundredth. Percentages can be converted into decimals and fractions by dividing the percentage value by a hundred.

Given, You had $50. You spent 10% of the money on clothes, 20% on games, and the rest on books.

Therefore, The expression that represents the context is,

$(50 - (10/100)×50 - (20/100)×50).

= $(50 - 5 - 10).

= $35.

SO, $35 she spent on books.

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Michael bought a $25.00 gift for a friend. After he bought the gift, Michael had $176.89. Write and solve an equation to calculate how much money Michael had before he bought the gift.

Answers

76.89 + 25.00 =x       x= 201.89

Michael had 201.89 before he bought the gift.

What is the equation ?

An equation is a formula that expresses the equality of two expressions, by connecting them with the equals sign =.

Given

Michael bought a $25.00 gift for a friend

Michael have $176.89 after buying the gift .

Therefore, we can write the equation as,

Money with Michael before buying gift card = Money with Michael before after gift card

Money with Michael before buying gift card = 25 + $176.89

Money with Michael before buying gift card = $201.89

Therefore, Michael had $201.89 before he bought the gift.

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A circle has a diameter of 20 inches. Find the exact area and find the approximate area using π 3.14

Answers

The exact area is [tex]10^2\cdot \pi=100 \pi[/tex], using the approximation this is 314

Can i get some help please.
Which expressions are equivalent to( 5^3 x 5^2 )^4

A:25^20
B:(25^5)^4
C: none of the above

Thanks!!

Answers

(5^3×5^2)^4 = 5^((3+2)*4) = 5^20

Selection A is appropriate.

Express this equation in logarithmic form.

23 = 8

Answers

The exponential equation [tex]2^3 = 8[/tex] is equivalent to the log form equation [tex]\log_2(8) = 3[/tex]

The base of the log is the same as the base of the exponent. The 8 inside the log argument is the right hand side of the original equation. The goal with logs is to isolate the exponent, so that's why 3 is on its own side

Alvin’s age is two times Elgas age. The sum of their ages is 18. What is Elgas age?

Answers

Hey there! :D

18=2x+x

x= Elga's age. 

18=3x

Divide both sides by 3. 

x=6

Elga is 6 years old. 

I hope this helps!
~kaikers
18 times 18 eaqwalswhat bro that your awnser hope i help

 

What is the area of this figure? Select from the drop-down menu to correctly complete the statement. The area of the figure is cm². A square with sides measuring 6 cm. A trapezoid attached to the side of the square has a top length of 7 cm, a long leg side of 10 cm, and the bottom length, when combined with the length of the square, measures out at 21 cm.

Answers

To answer this question, you should draw it out- see the attached picture for the example. All the side lengths are labeled. You can then use the area of a trapezoid formula to find the total area.

A=1/2 (b1 + b2)h

You can see the substitution for each value in the work shown in the picture.

Answer: 102

A=1/2 (b1 + b2)h

If x = 12 cm, y = 8 cm, z = 10 cm, and w = 3 cm, what is the surface area of the geometric shape formed by this net?
A. 288 cm2
B. 144 cm2
C. 192 cm2
D. 160 cm2

Here's the shape: https://media.studyisland.com/pics/127804pic7.png

Answers

Solve for the area of the figures.
3 rectangles and 2 triangles (or 4 right triangles).

View attachment

btw I think you gave the wrong measurements probs cuz it doesn't come up with any of the options for the answer but I know it is 186 cm^2 for sure...

Find the length of BC.

Answers

Im pretty sure its 5

Hopes this helps, and plz mark Brainliest if correct!!
you have to do a square plus b square equal c square ... which would be 16+36=c square ... I think the answer is 7.2

can their be smaller integer than 0.5

Answers

Yes, but only if the integer is negative because all integers are whole numbers.

What is the area of the shape shown?

Answers

22x9 = 198

15x12 = 180

198+180 = 378
378 cm squared. If you split it into two shapes, the top rectangle's (9 x 10) area is 90 cm and the bottom rectangle's (24 x 12) is 288 cm. 288 plus 90 gets you to 378 cm squared.

ANSWER ASAP WILL GIVE BRAINLIEST Boris solves the system of equations using the linear combination method.

3x+4y=−87x−3y=6
Which steps would allow him to eliminate the y terms in the system of equations?


Multiply 3x+4y=−8 by 3. Multiply 7x−3y=6 by 4. Add the resulting equations together.

Multiply 3x+4y=−8 by 7. Multiply 7x−3y=6 by −3 . Add the resulting equations together.

Multiply 3x+4y=−8 by 4. Multiply 7x−3y=6 by 3. Add the resulting equations together.

Multiply 3x+4y=−8 by −3 . Multiply 7x−3y=6 by 7. Add the resulting equations together.

Answers

The answer is А

Multiply 3x+4y=−8 by 3. Multiply 7x−3y=6 by 4:
{3x + 4y = -8   |*3
{7x - 3y = 6     |*4

{9x + 12y = -24  
{28x - 12y = 24

Add the resulting equations together:
37х = 0




Answer:

a is the answer

Step-by-step explanation:

i did the test

Bailey’s Cakes and Pastries baked a three-tiered cake for a wedding. The bottom tier is a rectangular prism that is 18 centimeters long, 12 centimeters wide, and 8 centimeters tall. The middle tier is a rectangular prism that is 12 centimeters long, 8 centimeters wide, and 6 centimeters tall. The top tier is a cube with edges of 4 centimeters each. What is the volume of each tier and of the entire cake?

Answers

the bottom tier is 18+12+8 = 38
the middle tier is 12+8+6 = 26
the top tier is 4x3 = 12
the total is 76


The formula for doing this is Length plus Width plus Height.

Answer:

the top tier is 64 cubic centimeters

the middle tier is 576 cubic centimeters

the bottom tier is 1728 cubic centimeters

the entire cake is 2368 cubic centimeters

Step-by-step explanation:

How do you find the value for x in the problem?

Answers

Make use of the fact that side lengths in similar triangles are proportional.
.. 30/18 = (20 +x)/20
.. 20*(30/18) -20 = x . . . . multiply by 20, subtract 20
.. 33 1/3 -20 = x . . . . . . . . evaluate the product
.. 13 1/3 = x

24 squared + 10 squared = x squared

Answers

Six hundred Seventy-Six

The relation {(-1, 4), (2, 7), (3, 7)} is a function. True False

Answers

Tryour answear is true

Answer:

True

Step-by-step explanation:

I did the quiz and got 100%

What is 3.4 mph (miles per hour) converted to feet per seconds?

Answers

I think the answer is 4.987 feet per second.

A pool pump fills 1/6 of the pool in 1/3 hour. How much of the pool is filled in one hour

Answers

1/2 way because to get to a full hour with 1/3 you have to multiply by three so you multiply 1/6 by 3 and get 3/6 which is simplified to 1/2. Hope I helped!
For this, we can just multiply 1/6 by 3 since you have to multiply 1/3 by 3 to get to one hour ( basically just adding 1/6 every 1/3 of an hour until the full hour).
1/6•3=3/6=1/2
So, half of the pool will be filled in one hour.

Marlene's taxable income is $95,000. Use this tax schedule to calculate the total amount she owes in taxes. $12,888.75

Answers

Marlene owes a total of $20,710.75 in taxes.

If we are using the same tax schedule then $95,000 belongs to this bracket:
Over -        But not over -                                             of the excess over -
$77,100     but not over $160,850.. 15,698.75 plus 28%            77,100

Get the 28% of the difference between $95,000 and $77,100:
$95,000 - $77,100 = $17,900
$17,900 * .28 = $5,012

$15,698.75 + $5,012 = $20,710.75

jorge has a recipe that calls for 2 1/3 cups of flour he plans to make 1 1/2 times the recipe will the amount of flour jorge needs be equal to greater than or less than the amount of flour his recipe calls for

Answers

The correct answer is Greater than
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