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diamong [38]
2 years ago
10

What is the exact volume of the cone? (height is 9 cm, the radius is 15 cm)

Mathematics
2 answers:
Ugo [173]2 years ago
8 0
D is the answerr to the first one.
Illusion [34]2 years ago
6 0
1: Exact volume of cone =  r^2 * h/ 3 =  15^2 * 9 / 3 =    225 * 9=  2025/3 = 675

2: Approximate volume of cone: pi* r^2 * h / 3 =  3.14 * 10^2 * 9/3 = 3.14 * 100* 9/3 =   3.14 x 900 / 3   = 2826/3 = 942 cm^3

3:  Asks for the same as problem above, but we have to divide the diameter by 2 to get the radius first 10/2=5 now we can solve. : 3.14 * 5^2 * 5/3 =   3.14 * 25 * 5/ 3 =  3.14 * 125 / 3  = 392.5/ 3 = 130.8 m^3

The exact volume does not use pi: so that is why the first one is 675
The Approximate used pi or 3.14. 
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Simplify. 4a(6) + 3a
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Answer: 27a

Step-by-step explanation:

1. Simplify 4a×6 to 24a.

24a+3a

2. Simplify.

27a

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3 years ago
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a magazine contains fourteen pages. You open to a random page, the page number is three or seven..... where do i start i need to
UkoKoshka [18]
This is a question of randomness so there really is no answer. I would guess 7 since that is the center page and you're more likely to open it up in or near the middle
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2 years ago
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the units digit of a two-digit number is twice the tens digit. If the digits are reversed, the new number is 9 less than the ori
Anton [14]

Answer:

36

Step-by-step explanation:

Here is the correct and complete question: The units digit of a two-digit number is twice the tens digit. If the digits are reversed, the new number is 9 less than twice the original number. What is the original number?

Lets assume the original number be"10y+x". (x is unit digit and y is 10th digit)

∴ if number is reversed then resulting number be "10x+y".

As given: x= 2y

        and 10x+y= 2(10y+x)-9

Now, solving the equation to get original number.

10x+y= 2(10y+x)-9

Distributing 2 to 10y and x, then opening the parenthesis.

⇒ 10x+y= 20y+2x-9

subtracting by (2x+y) on both side.

⇒ 8x= 19y-9

subtituting the value of "x", which is equal to 2y.

∴ 8\times 2y= 19y-9

⇒ 16y=19y-9

subtracting both side by (16y-9)

⇒ 3y= 9

cross multiplying

We get, y= 3

y=3

∵x= 2y

x=2\times 3= 6

∴ x= 6

Therefore, the original number will be 36 as x is the unit number and y as tenth number.

6 0
3 years ago
Jovie is maintaining a camp fire. She has kept the fire steadily burning for 10 hours with 15 logs. She wants to know how many h
tester [92]

Answer:

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Step-by-step explanation:

We can use ratios to solve

10 hours           x hours

-------------- = -------------

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Using cross products

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Divide by 15

90/15 = 15x/15

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7 0
3 years ago
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miv72 [106K]
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= 2.4

And I don't understand your second question.
5 0
3 years ago
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