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This is strictly NOT a A.P. This is called "Sequence of trianangular numbers", and can be summed up using the following formula: n[n +1]*[n + 2] / 6. So, the first 10 terms will sum up to:[10*11*12]/6=220.

I think that the sumtotal upto n is n² .

edit: never mind it is wrong, I only tried when n=1,2,3 and all of them had a sumtotal of a squared number.

1 You'll have to calculate the volume of the individual pieces and then add them together. 

2  SOMEtimes Calculus can help solve these problems

3 A displacement tank......put the volume underwater and see how much fluid is displaced

4 If possible, see how much volume of fluid the object will HOLD

You are welcome.

I hope that they help you.   

Come back and ask more questions if you want to :))

thanks!!

Here are some vidos on scientific notation :)

What's 7 1/3x7 1/3

22/3 x 22/3 =484/9=53 7/9

Solve for U:
U/5-2.6 = 3.8

Put each term in U/5-2.6 over the common denominator 5: U/5-2.6  =  U/5-(13.)/5:
U/5-(13.)/5 = 3.8

U/5-(13.)/5 = (U-13.)/5:
(U-13.)/5 = 3.8

Multiply both sides of (U-13.)/5 = 3.8 by 5:
(5 (U-13.))/5 = 5×3.8

(5 (U-13.))/5 = 5/5×(U-13.) = U-13.:
U-13. = 5×3.8

5×3.8  =  19.:
U-13. = 19.

Add 13. to both sides:
U+(-13.+13.) = 19.+13.

13.-13. = 0:
U = 19.+13.

19.+13. = 32.:
Answer: |  U = 32.

10, 20, 30, 40, 50..............3,650, so the total will be:

[365 x 366] /2 x 10 =$667,950

Oh you think? well sometimes math tortures me till I wanna cry but overall it's pretty awesome! And helpful too. :)

292 

What I understand that in your first day you will have 10, and in your second day you will have 30 , and in your fourth day you will have 60, and so on. If that is what you meant then,

the formula is 10(n/2)(n+1),where n = the number of days. We can use this formula to see how much you would end up with in a year(365 days), just substitute n with 365 and we will get: 10(365/2)(365+1) = 667950

So you will end up with 667950 at the end of the year.

I hoped I managed to help you.

$10 per day every day for 365 days = 365*10 = $3650

Is that what you meant?

You are very welcome MWizzard :)

Thanks btw

10−9×(−6)+​−2​​−10​​10, minus, 9, times, left parenthesis, minus, 6, right parenthesis, plus, start fraction, minus, 10, divided by, minus, 2, end fraction

\(10−9×(−6)+​−2​​−1010-9*{-6}+\frac{-10}{-2}\\ =10−9×(−6)-2​​−1010-9*{-6}+\frac{10}{2}\\ =10+54\qquad -2​​−1010\quad -9*{-6}+5\\ =10+54\qquad -2​​−1010\quad +54\qquad+5\\ =64\qquad -2​​−1010\quad +59\\ =64\qquad ​​−1012\qquad +59\\ =123 \qquad ​​−1012\qquad \\ =-889\)

tanx=3/6

atan(0.5) = 26.565051177078 degrees

Hi Guest,

This site has always been cyclic.

At a particular time we have a group of young people (with a couple of key people) join up and the place becomes a social hub.  I suspect that many of the visitors that you speak of are social visitors. 

Then for various reasons one or two key people leave, (this time 2 of those key people were Hayley and Coldplay) this is the beginning of a major exodus. 

The place then become very quiet for a few months until the next group of young people arrive and the place blossums again for a period of time.  

I think this is a cycle that will continue indefinitely.  I also suspect that it is a standard phenomenon of many internet sites.  :(

how to work out 12 1/2 percent of 360?

\(12\frac{1}{2} \div 100\times 360\)

(12+1/2)*360? = 4500

Well guest, if you do not think it is hard then you probably enjoy it.

Why don't you become a member.

Your little mickey mouse pic would make a great icon :)

Hi MWizzard   :)

two cards are drawn from a standard deck of 52 cards. What is the probability that the following occurs? (2 red cards or 2 jacks)

P(2 reds OR 2jacks) = P(RR)+P(JJ)-P(2 red jacks)

\(=\frac{26}{52}\times \frac{25}{51}+\frac{4}{52}\times \frac{3}{51}-\frac{2}{52}\times\frac{1}{52}\\ =\frac{26*25}{52*51}+\frac{4*3}{52*51}-\frac{2*1}{52*51}\\ =\frac{650+12-2}{52*51}\\ =\frac{660}{2652}\\ =\frac{55}{221}\)

MWizzard, your answer is slightly wrong.  

These are all permutations and you can choose jack of hearts then jack of diamonds or vise versa. So that is 2 ways.

So you have to subtract 2 not 1.

20 ÷ 25 = 20 / 25

             = 4 / 5

            = 0.8