help me @geerky42

- brucebaner

help me @geerky42

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- brucebaner

What is the approximate volume of a cone with a height of 6 mm and radius of 18 mm?
Use 3.14 to approximate pi, and express your final answer to the nearest tenth.

- brucebaner

i got 2035.75203953 but i dont know how to round is to the nearest tenth

- brucebaner

@kobeni-chan

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## More answers

- kobeni-chan

The tenth place in a decimal is the number right after the decimal point (7).
To round to the nearest tenth, you look to the number afterwards (in the hundredths) which is 5.
If the value of the number in the hundredths place is less than 5, you keep the number in the tenths place. If the value of the number in the hundredths place is 5 or greater, you round up :)

- brucebaner

im bad at this

- kobeni-chan

|dw:1432959289012:dw|

- brucebaner

okay

- brucebaner

so 2036.52?

- kobeni-chan

Not quite. You're rounding to the nearest tenth, so there will only be one number after the decimal point, which right now is 7
The rule for rounding is to look one place to the right (which is 5 in this case).
If the number you are looking at is less than 4, then keep the tenth place number the same.
If the number you are looking at is 5 or greater, you will up the value of the tenth place number by 1.

- brucebaner

so 2036.5?

- kobeni-chan

Closer. Your original number that you gave was 2035.75203953
You are keeping everything to the left of the decimal point the same.
Right now you're just looking at the tenths and hundredths columns (where I drew the lines in my picture)

- brucebaner

so 20365.7?

- kobeni-chan

Remember, you keep everything to the left of the decimal point the same. 2035 is staying the same. You are just focusing on the numbers after the decimal point.

- kobeni-chan

Look at my picture. We are deciding whether 7 is going to stay the same, or round up to 8.

- brucebaner

2036.60? or 2036.6

- kobeni-chan

In the beginning you said you got 2035.75203953 for your answer. Can you make sure that you gave us the right number real quick?

- brucebaner

okay so i did this v=1/3⋅π⋅18^2⋅6

- kobeni-chan

If you Google 'volume of a cone', this will show up. You can just put in the values of the radius and the height and it'll give you an answer.

##### 1 Attachment

- kobeni-chan

Then, tell me what it says after V= (or the two squiggly lines)

- brucebaner

wait the radius

- kobeni-chan

Well first do you see on your screen what you see in my picture?

- brucebaner

yes

- brucebaner

i got it is it 2035.75?

- kobeni-chan

That should be right. So you will be keeping 2035 the same; you're not changing *anything* to the left of the decimal point.

- brucebaner

so im right?

- kobeni-chan

Yes, but your question is still asking for your final answer to be rounded to the nearest tenth. So what number is in the tenths place?

- brucebaner

damm i got 60 i need 80 i cri ever time

- kobeni-chan

on a test?

- brucebaner

it was 2034.7

- brucebaner

the correct answer is 2034.7.

- kobeni-chan

Oh :/ on Google did you type in the right radius and height?

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