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April 18, 2014

Search: sum fun (math)

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sum fun (math)
find a quick and easy method to compute the sum of the first 100 counting numbers (no calculators allowed)
Wednesday, January 27, 2010 at 6:04pm by Jenny

English
fun   /fʌn/ Show Spelled [fuhn] Show IPA noun, verb, funned, fun·ning, adjective –noun 1. something that provides mirth or amusement: A picnic would be fun. 2. enjoyment or playfulness: She's full of fun. –verb (used without object), verb (used with object) 3...
Wednesday, March 30, 2011 at 9:51pm by rfvv

English
From the dictionary, here is the word fun: fun    /fʌn/ Show Spelled [fuhn] Show IPA noun, verb,funned, fun·ning, adjective –noun 1. something that provides mirth or amusement: A picnic would be fun. 2. enjoyment or playfulness: She's full of fun. –verb (used ...
Saturday, March 20, 2010 at 12:00am by SraJMcGin

English
1. This book is really fun. 2. This book is real fun. 3. This book is great/good fun. (I have a question. You said #1 and #2 are right, but that #2 is not right. What about 'good' fun? Is it right to use 'good fun' instead of 'great fun'? If #3 is right, why is #2 not right? ...
Saturday, March 20, 2010 at 12:00am by rfvv

math
6 + 6/3 + 6/3^2 + 6/3^3 + ... we have a GS, where a = 6 and r = 1/3 sum(infinite number of terms) = a/(1-r) = 6/(1-1/3) = 6/(2/3) = 6*3/2 = 9 check: sum(1) = 6 sum(2) = 6 + (1/3)(6) = 8 sum(3) = 6 + 6/3 + 6/9 = 8 2/3 sum(4) = ....... = 8 8/9 sum(5) = .... 8 26/27 etc
Wednesday, August 22, 2012 at 3:23pm by Reiny

math URGENT!!!!
i have a list of 5 different numbers. the sum of 2 of the numbers is 0. the sum of 2 of the numbers is 1. the sum of 2 of the numbers is 2. the sum of 2 of the numbers is 3. the sum of 2 of the numbers is 4.the sum of 2 of the numbers is 5.the sum of 2 of the numbers is 6. the...
Monday, October 29, 2012 at 5:14pm by dan

English
Posted by rfvv on Wednesday, March 30, 2011 at 9:51pm. 1. Dancing is fun. (Is 'fun' and adverb or a noun? English - Writeacher, Wednesday, March 30, 2011 at 9:57pm In this sentence, it's an adjective, modifying "Dancing." English - rfvv, Thursday, March 31, 2011 at 2:05am fun...
Thursday, March 31, 2011 at 2:06am by rfvv

Trigonometry
Let's solve this fun trigonometric fun math problem! 1.) SEC²X-1/SIN²X
Sunday, February 10, 2013 at 2:02am by AwesomeGuy

curious
hi i'm just curious is the desire to have fun inspired by need or by artificial stimulation You must first define fun. Fun is like beauty; i.e., in the eyes of the beholder.
Saturday, September 9, 2006 at 8:52pm by Anonymous

Spanish-SraJMcGin please check
If you are saying that "to practice" (practicar) es fun = es difertido. But if you are saying "swimming" (la natación is fun) = es divertida. Or, in other words, "climbing" (to climb) is fun = es divertido BUT if the mountain (la montaña) is fun = es divertida. You need to ...
Saturday, October 22, 2011 at 10:06am by SraJMcGin

math
x+y = sum ---> y = sum - x product = xy = x(sum-x) ------> x^2 - sum x + product = 0 x = sum/2 ± sqrt[(sum/2)^2 - product] There are two solutions because interchanging x and y in the solution will yield another solution. This means that you can take: x = sum/2 - sqrt[(...
Monday, December 3, 2007 at 7:16pm by Count Iblis

math trivia
larry has 3 children. the product of their ages is 36 and the sum of their ages wont help you. the youngest is blonde. how old are the children? this is a "fun" math activity? help!! :)
Sunday, March 27, 2011 at 8:09pm by dawn

English
What do you think about the movie. 1. I thought it was really fun. 2. I thought it was real fun. 3. I thought it was really funny. 4. I thought it was real funny. 5. I thought it was great fun. 6. I thought it was really fun. 7. I think it was a great fun. (Which ones are ...
Saturday, March 27, 2010 at 7:45am by rfvv

Health
Dr. Margo Maine suggests that people exercise for the three F’s which include ________. A. Fun, fitness and friendship B. Fun, faith and fitness C. Fitness, fortification, and force D. Fitness, fun, and fairness A?
Friday, August 3, 2012 at 10:13pm by Aya

English
It would be better not to use "fun" as a direct modifier. It's very slang-y! Use "entertaining" or "lively" or "witty" or something more specific: http://thesaurus.com/browse/fun Once you change "fun," all the sentences are OK, but #1 is the most commonly used.
Saturday, December 18, 2010 at 7:25am by Writeacher

sum fun (math)
Like Gauss did it? 1 + 100 = 101 2 + 99 = 101 3 + 98 = 101 . . . 50 + 51 = 101 get it ?
Wednesday, January 27, 2010 at 6:04pm by Damon

Mathematics. Geometric sequences.
a = 2 , r = 2 sum(n) = 2(2^n - 1)/(2-1) = 2(2^n - 1) = 2^(n+1) - 2 sum(n+1) = 2(2^(n+1) - 1)/1 = 2(2^(n+1) - 1) = 2^(n+2) - 2 sum(N+1) - sum(n) =2^(n+2) - 2 - (2^(n+1) - 2) = 2^(n+2) - 2^(n+1) = 2^(n+1) (2 - 1) = 2^(n+1) , which is a positive number so sum(n) < sum(n+1)
Sunday, March 10, 2013 at 1:46pm by Reiny

English
1. That sounds fun to me. (What is the part of sppech of 'fun'? Is it a noun or an adjective? What about "funny" instead of "fun"? 2. That sounds funny to me. 3. That sounds interesting to me. (Do the three have the same meaning?)
Tuesday, December 1, 2009 at 5:38am by rfvv

math
I'll give it a try. (1-x)y"+y=0 at x0=0 A. Check for singular points. Write as y"+(1/1-x)y=0 and find Lim x->0 (1/1-x) = 1 Therefore x0=0 is not a singular point. B. Assume y=∑an x^n for n=0 to ∞ then (1-x)y"=∑n=0 to ∞ (n)(n-1)an x^(n-2) =∑n=2 to &...
Saturday, April 21, 2012 at 5:18pm by MathMate

Calculus
It means you are trying to win the lotto from a useless formula that some blokes made up to have a fun time... Fun time of what you ask? Fun time at laughing at alllll the people who believe this BS...
Wednesday, February 2, 2011 at 7:44pm by jay jay

math models
Sum = P(1+i)^n where Sum = the accumulated sum P = the amount deposited i = the periodic decimal interest rate n = the number of compounding periods Therefore, Sum = 5000(1+.06/2)^(5x2)
Monday, December 12, 2011 at 5:11pm by Anonymous

math
excuse me but my english is so bad 72=2*2*2*3*3 72=2*2*18 (sum 22) 72=2*3*12 (sum 17) 72=2*4*9 (sum 15) 72=2*6*6 (sum 14) 72=3*3*8 (sum 14) 72=3*4*6 (sum 13) due to the fact mrs raines needed more info, only "2*6*6" and "3*3*8" are posible. "her eldest son" means "no twins" so...
Sunday, December 23, 2007 at 4:19pm by moimk

French
Prepare three groups of statements that compare three things. The sentences may be something similar to this: Music is fun. Tennis is more fun than music. French is the most fun of the three.
Friday, October 9, 2009 at 12:32pm by Keyanna

English
1. The fun play will be put on in Room 1-3. 2. The fun play will be put on in Classroom 1-3. The fun play will be put on in Class 1-3. (Are they the same? Which expression do we have to use?)
Saturday, December 18, 2010 at 7:25am by rfvv

computer fun
My sister has no websites to go to for fun.She is 10 so what do you suggest?
Sunday, March 6, 2011 at 5:46pm by Joe

Calculus
Interesting the answer is halfway between. Exploring that Say a sum of two numbers is s We want to minimize the sum of squares of x^2 and (s-x)^2 sum = 2 x^2 -2sx d sum/dx = 0 = 4 x -2s x = s/2 so it works for any old sum, not just 10
Tuesday, December 16, 2008 at 7:52pm by Damon

for fun
a person who studies and collects rocks for fun
Tuesday, March 16, 2010 at 9:50pm by Anonymous

English
1. Dancing is fun. (Is 'fun' and adverb or a noun?
Wednesday, March 30, 2011 at 9:51pm by rfvv

math
Find the two numbers that multiply to the product number and add to the sum number of the following: a)Product 563033256; Sum 51895 b)Product -43481220; Sum 28429 c)Product 2545124358; Sum -105619 I tried xy = product and x+y = sum, but it didn't work out... Can someone please...
Monday, December 3, 2007 at 7:16pm by Lily

English
1. This book is really fun. 2. This book is real fun. 3. This book is great fun. (Which one is correct? Are all corect? What is the part of speech of 'fun'?) 4. Shine a light on the back of the stage. 5. Shine a light at the back of the stage. 6. Shine a light in the back of ...
Friday, March 19, 2010 at 9:39am by rfvv

fun facts
what are some fun facts on multitasking? if not that what are some websites to find good fun facts
Sunday, March 25, 2012 at 8:25pm by Samantha

Math
sum of x is meaningless sum of squares. a^2 + b^2 3^2 + 4^2 x^2 + y^2 sum of x^2 is meaningless a sum need two addends.
Thursday, September 19, 2013 at 10:54pm by Steve

antonyms
This could be fun. innocent/guilty smooth/rough Please join the fun and see what you can figure out!
Wednesday, November 18, 2009 at 10:41pm by Ms. Sue

English 7
Is there any quotes about having fun, spend your time now to have fun to remember this moment...., and friendship.
Saturday, February 4, 2012 at 5:08pm by Laruen

Math
The sum of 16terms of an A.P IS -504,while the sum of its 9terms is -126. Find the sum of its 30terms
Thursday, October 27, 2011 at 3:18am by Anonymous

Math
The sum of 16terms oe an A.P is -504,while the sum of its 9terms is -126.Find the sum of its 30terms
Thursday, October 27, 2011 at 10:14am by Anonymous

math
This is an arithmetic series Sum(n) = (n/2)[2a + (n-1)d] where a is the first term n is the number of terms d is the common difference, and Sum(n) is the sum of the n terms So you want Sum(49) with a=40, d=-3 and n = 49 substitute
Tuesday, November 3, 2009 at 1:15am by Reiny

math
Notice all the numbers divisible by nine have a sum of digits that is divisible by nine also. 18 sum is 9 36 sum is 9 162 sum is 9
Friday, October 10, 2008 at 9:39pm by bobpursley

math
find the sum of each of the following infinite series, if no sum, write no sum. 9-3+1-1/3+1/9... 1/2+1+2+4...
Saturday, March 20, 2010 at 8:14pm by purple1

Math
X X2 1 1 2 4 3. 9 5 25 8. 64 10 100 It asks me to do the Sum of X Sum of Squares Sum of X squared Can you please help me on this. I don't get it
Friday, September 20, 2013 at 2:09pm by ios7

English
1 and 3 are fine; 2 is not grammatically correct. "Fun" is a noun. http://www.answers.com/topic/fun 4, 5, 6 -- I've answered these before.
Friday, March 19, 2010 at 9:39am by Writeacher

Science
Thank you for using the Jiskha Homework Help Forum. Everyone needs some fun! But, I doubt every one has fun all the time!
Saturday, November 17, 2007 at 6:53am by SraJMcGin

Math
How do you do. Please Explain Sum of X Sum of Squares Sum of X squared
Thursday, September 19, 2013 at 10:54pm by ios7

math
this is real hard and i would love some help. In a game of craps, a player rolls 2 balanced dice. There are 36 equally likely outcomes. What is the probability that: a) the sum is either 3 or 8 b) the sum is 6 or doubles rolled c) the sum is 6 AND doubles d) the sum is 6 and ...
Saturday, November 1, 2008 at 11:43pm by austin

probability
two fair six-sided dice are rolled and the sum of the dots on the top faces is recorded. a) complete the table, showing the number of ways each sum can occur sum: 1 2 3 4 5 6 7 8 9 10 11 12 ways:1 2 3 b)use the table to find the probability of the following events. A:the sum ...
Tuesday, November 27, 2012 at 11:36pm by mary

Math
abc=36 The only factors of 36 are 1,2,3,4,6,9,12,18,36 The only sets of 3 factors are 1,1,36 sum=38 1,2,18 sum=21 1,3,12 sum=16 1,4,9 sum=14 1,6,6 sum=13 2,3,6 sum=11 + 5 = 16 we have a winner! 3,3,4 sum=13
Friday, March 29, 2013 at 5:07pm by Steve

Statistic/Psychology
If the correlation between one's interest in statistics and being a "fun date" was -0.70, it would mean that: a. The higher someone's interest was in statistics, the more likely it would be that he or she is a fun date b. The higher someone's interest was in statistics, less ...
Friday, July 26, 2013 at 7:08pm by Crystal

math
let one number be x, then the other is n^2/x sum = x + n^2/x d(sum)/dx = 1 - n^2/x^2 = 0 for a minimum n^2/x^2 = 1 n/x = ± 1 x = N or x = -N e.g. If N^2 = 144 then both numbers would be 12 (or both numbers would be -12) factors of 144 = 12x12 ---- sum = 24 = 4x36 ---- sum = 40...
Monday, February 14, 2011 at 12:42am by Reiny

Math
The sum of the series ∑cos(nx) is, according to Mathworld, N ∑cos(nx) = cos(Nx/2)sin((N+1)x/2) / sin(x/2) n=0 (Note that the summation starts from 0, make adjustments accordingly). The given series has x=1, or S(1)=∑cos(n) We see that the sum to N oscillates as N ...
Thursday, May 31, 2012 at 8:49pm by MathMate

calculus
find the sum of the series: 1. the sum from n=1 to infinity of ((-1)^n*(.2)^n)/n I simplified this to: (-.2)^n/n I know this is alternating, but how do I know what the sum is? 2. the sum from n=0 to infinity of 1/2^n Is this geometric with n^(-2)? and if so, do you use the ...
Friday, March 21, 2008 at 1:02am by sarah

lal
how to say FUN in a PLURAL way my sentence is fundraising is the easiest and (fun) way in school
Saturday, April 24, 2010 at 9:51pm by Jane

calculus
Find the sum of the series (-1)^n (5^(2n))/n! 1. sum = e^25 2. sum = e^−5 3. sum = 5 4. sum = e^5 5. sum = 25 6. sum = e^−25
Thursday, September 30, 2010 at 9:39pm by Bob

Socials
Is it possible that there's nothing to do on Guadeloupe that YOU consider fun? What about things to do that other people might consider fun?
Monday, May 6, 2013 at 5:12pm by Ms. Sue

Calculus
Determine convergence or divergence for the following series. State the tests used and justify your answers. Sum (infinity, n=1) 1/(1+e^-n) Sum (infinity, n=1) (2*4*6...2n)/n! Sum (infinity, n=0) (n-6)/n Sum (infinity, n=0) (n-6)/n! Sum (infinity, n=0) (100n^14)/4^n
Monday, March 4, 2013 at 4:09pm by Jade

Math
When you are given the sum and the difference of two numbers, sum (total) =53 difference (more than) = 2 then bigger number=(sum+difference)/2 smaller number = (sum-difference)/2
Thursday, February 16, 2012 at 7:24pm by MathMate

computers
sorry but do you know any fun websites that i could play educational games and games that are for fun?
Wednesday, December 26, 2012 at 4:55pm by anonymous

English
The word "fun" is essentially a noun, but in informal English is also used as an adjective: http://www.answers.com/fun The three sentences don't have the same meening. #1 -- something enjoyable #2 -- something to make you laugh #3 -- something to keep your attention
Tuesday, December 1, 2009 at 5:38am by Writeacher

Math
for any odd number (b), there are (b-1)/2 odd numbers less than it. check on that thinking. for b= 11, the odd numbers less are 1,3,5,7,9 or five. Yep, it works. There are 1000 numbers for the choice of b, so there must be this number of ordered pairs: Sum b=1 to 1999(0dd) of...
Monday, September 10, 2007 at 12:01pm by bobpursley

Math
Minimizing Sum: Find two positive numbers whose sum is 100 and the sum of whose squares is a minimum.
Friday, October 9, 2009 at 9:27am by David

math/Probability
Let's take a look at what we DON"T want We do not want sums of 2, 3 and 4 sum of 2 -- 1 way sum of 3 -- 2 ways sum of 4 -- 3 ways , for a total of 6 we do not want Since the two dice can fall in 36 ways, 30 of them would exceed a sum of 4 prob(your event) = 30/36 = 5/6
Friday, June 11, 2010 at 1:03am by Reiny

math
generally you don't subtract 1, you subtract FROM 1 The prob. of anything is a number between 0 and 1, so often when there are many cases to consider, it might be easier to calculate the prob of the exceptions, then subtract that from 1. e.g. What is the probability of ...
Thursday, August 26, 2010 at 3:59pm by Anonymous

Pre-Cal
If the sum is five, then red,white can be 1,4 2,3 3,2 4,1 if the sum is four, then 1,3 2,2 3,1 if the sum is three, then 1,2 2,1 if the sum is two, then 1,1 I see 10 possible combinations, and the red is 2 in 3 of them. Pr(red=2, sum is =<5) is 3/10
Saturday, January 3, 2009 at 4:06pm by bobpursley

Fourth grade math
What is the sum of the six three-digit numbers that have the digits 1, 2, and 3? What is the sum in each column? Why is the sum in each column the same? my mom doesn't know how to help me with this one?
Friday, August 30, 2013 at 2:10am by Andrew

Math - Discrete math
(1) obviously false x^3+x=2 has no integer solution. x=0 is not a solution if x>=1, so is x^3, so the sum is > 2. and of course, if x<0, so is x^3, so their sum is negative. (2) since x and x^3 are both odd, the sum is even.
Friday, February 7, 2014 at 11:44am by Steve

English
The first one is correct. The second is okay, but in very informal speech (almost slang). Take a look at the definitions of the two words: http://dictionary.reference.com/browse/funny http://dictionary.reference.com/browse/fun The standard English use of the word "fun" is ...
Friday, December 10, 2010 at 3:21am by Writeacher

math
(sum(r) for r=1..n)^2 - (sum(r) for r=1..n-1)^2 = n^3 well, we know that n ∑ r = n(n+1)/2 r=1 so, square that and we have n^2(n+1)^2/4 Sum to n-1 instead of n, and we have (n-1)^2 n^2/4 Subtract to get n^2/4 ((n+1)^2 - (n-1)^2) = n^2/4 (4n) = n^3
Thursday, March 6, 2014 at 3:38pm by Steve

Math
ok, look at this patters sum of 1 odd number = 1 = 1^2 sum of 2 odd numbers = 1+3 = 4 = 2^2 sum of 3 odd numbers = 1+3+5 = 9 = 3^2 sum of 4 odd numbers = 1+3+5+7 = 16 = 4^2 ... sum of n odd numbers = 1+3+...+ (2n-1) = n^2 ( 2n-1) is the general expression for an odd number. ...
Friday, July 30, 2010 at 11:17am by Reiny

Pre- algebra Math 6 th grade Gifted
start at 499, 501 the sum is 1000 then 498,502 the sum is 1000 do that a total of 50 times, or 50000total, then add the center number, 500 to sum 50500 Now here is another way: pair the numbers, first to last: 1+1000=1001 2+999= 1001 do that till you have to 500times, sum is ...
Wednesday, October 28, 2009 at 5:47pm by bobpursley

English
1. Fine 2. Correct the spelling of "gardening" -- otherwise, it's fine. 3. Change "cookeries" to "recipes" and it'll be fine. 4. The animation program is very fun because we can smile all the time. ~~>Does your ability to smile cause the animation program to be fun? I don't...
Wednesday, April 8, 2009 at 5:08pm by Writeacher

Spanish
spelling! unas millas cuadradas de hierba lujosa = some square miles of luxurious grass. I remember answering this yesterday. What happened? This is a fun party ; therefore come and participate in the fun. Sra
Monday, September 28, 2009 at 7:14pm by SraJMcGin

math
When two die are tossed,throwing a sum of 7 is three times more likely than throwing a sum of 11.if the probability of throwing a sum of 11 is 1:18,what is the probability of throwing a sum of 7?
Wednesday, May 2, 2012 at 11:42am by Cherie

Math
1) 1+3 = 4 2) 1 + 3 + 5 = 9 = 4+5 3) 1+3+5+7 = 16 = 9+7 4) 1+3+5+7+9 = 25 = 16+9 in general sum number n+1 = sum n + 2n+1 but notice 1) 4 2) 9 3) 16 4) 25 now that is interesting, let's look at n=5 and n = 6 5) 25+ 11 = 36 LOL 6) 36 + 13 = 49 well we have the sequence of ...
Saturday, March 9, 2013 at 12:40pm by Damon

math
Make a list of all possible combinations of three numbers with a product of 36. There are not very many. The prime factors are 1*2*2*3*3. Make up the combinations from them, in groups of 3. Then compute the sums. 3 2 9 Sum = 15 18 1 2 Sum = 21 2 3 6 Sum = 11 3 3 4 Sum = 10 Add...
Tuesday, September 30, 2008 at 12:07am by drwls

Spanish
Me gustaron las vacaciones porque fueron divertidas. (However, there is a great verb "divertirse" which is "to have fun" and it is much more idiomatic to say "porque me divertí" = because I had fun.) Sra
Wednesday, March 11, 2009 at 7:04pm by SraJMcGin

Math
Find the sum of all 3-digit positive numbers N that satisfy the condition that the digit sum of N is 3 times the digit sum of N+3.
Tuesday, March 19, 2013 at 8:56am by Hale

math
t1 = 23 ---> a = 23 t3 = 92 --->ar^2 = 92 divide them r^2 = 4 r = ± 2 sum(n) = a(r^n - 1)/(r-1) = 6813 If r = 2 23( 2^n - 1)/(2-1) = 6813 2^n - 1 = 296.21... ------> not a whole number so there can't be a sum of 6813 if r = -2 23((-2)^n - 1)/(-2-1) = 6813 (-2)^n = -...
Monday, June 3, 2013 at 7:54pm by Reiny

college math
I do not understand a problem from a text book or how to solve the problem for the answer. Could shomeone show me the steps (show work) on how to solve this question. The sum of the intergers from 1 through n is n(n+1)/2. the sum of the squares of the intergers from 1 through ...
Friday, August 13, 2010 at 1:02pm by dave

maths
Find the sum of all 3-digit positive numbers N that satisfy the condition that the digit sum of N is 3 times the digit sum of N+3. Details and assumptions The digit sum of a number is the sum of all its digits. For example, 1123 has a digit sum of 1+1+2+3=7. The number 12=012 ...
Thursday, March 21, 2013 at 6:34am by rohit

science
does anyone know of a fun science activity or something fun i could do for my spinal cord project. I have to be creative which i have a lot of trouble with!
Monday, June 9, 2008 at 9:24pm by Anonymous

math
If you take 7 minus the result of a dice throw, then that's another valid dice throw. So, for two dice throws, the probability that the sum is greater than 8, is the same as the probability of 14 minus the sum being larger than 8, which is the same as the probability of the ...
Saturday, April 25, 2009 at 2:42pm by Count Iblis

Math
sample space: cards --- sum 1 2 --3 1 3-- 4 1 4 --5 1 5 --6 1 6 --7 1 7 --8 1 8 --9 1 9 -- 10 1 10 -- 11 total outcome here is 9 , one with a sum of 5 2 3 --5 2 4 -- 6 .. 2 10 -- 12 total outcome here is 8 , one with a sum of 5 3 4 3 5 .. 3 10 -- total outcomes here is 7, no ...
Saturday, August 17, 2013 at 8:23pm by Reiny

english
Angie, I think this is a great thought-provoking assignment! :) Have fun, be creative. I would suggest thinking about the topic first. How do you want to answer, what is important to you, etc. Do some brainstorming prior to your writing. Have fun! :)
Monday, September 10, 2007 at 2:32pm by Food4thought...

math
The sum of first 13th term as G.P. Is 21 and the sum of 21th term in 13. find the sum of first 34th terms.
Thursday, July 28, 2011 at 7:03am by Nakum Bakul

Precalculus
Find the sum of the first 50 terms of the sequence 2,4,6,8........ That is twice the sum of 1+2+3+...+50 For 1+2+...+N, the sum is N(N+1)/2 The sum is therefore 2*[50*51)/2) = 2550
Saturday, June 16, 2007 at 8:13am by Laura

Math
for 1. a) I would simplify a bit further. Tn=5+(n-1)1.5 = 5 + 1.5 n - 1.5 = 1.5n + 3.5 for b) find the sum of the first 13 terms, then find the sum of the first 9 terms. 2. Clearly a geometric sequence if the expression is (1/2)^(n-3) The problem is that you did not specify ...
Saturday, April 19, 2008 at 3:14am by Reiny

maths
From the centre of a polygon of n-sides (n-gon), draw rays towards the n-vertices thus forming n triangles. The sum of internal angles of the n triangles equals 180n°. This sum also equals the sum of the n interior angles plus the angles around the central point, 360°...
Saturday, June 4, 2011 at 11:15am by MathMate

math
How would I do this? A sum of money is divided among three persons, X,Y,Z, kn the ratio 10:7:5. If Y gets $14 more than Z, how much will X get and what is the total sum of money? There is no total sum so how do I find it?
Saturday, October 24, 2009 at 5:39pm by Alex

Calculus
clearly 1+2+4+8+ ... + for 64 terms a GS, where a=1, r=2 and n=64 sum(64) = 1(2^64 - 1)/(2-1) = 2^64 - 1 notice for this series sum(2) = 3 = 2^2 - 1 sum(3) = 7 = 2^3 - 1 sum(4) = 15 = 2^4 - 1 ... sum(64) = 2^64 - 1
Sunday, September 18, 2011 at 8:06pm by Reiny

arithmetic
So Sum(5) - Sum(4) = term(5) 85-(-8) = a + 4d a+4d = 93 < (#1) Sum(4) = -8 , since there are only 4 terms I will not use the sum formula a + a+d + a+2d + a+3d = -8 4a + 6d = -8 2a + 3d = -4 , (#2) 2(#1) - (#2) ---> 5d = 190 d = 38 in #1, a = -59 check: -59 - 21 + 17+ 55...
Tuesday, December 27, 2011 at 9:13pm by Reiny

Math
the sum of the 1st n elements is 1,3,6,10,15,... it will be a cubic, since it's the sum of n(n+1)/2 for n terms Sum of 1st n triangular numbers is n(n+1)(n+2)/6 sum of 1st 99 elements is thus (99)(100)(101)/6 = 166650 So, the 100th element begins with the number 166651 since ...
Saturday, February 9, 2013 at 4:04pm by Steve

6th grade Math
average = sum/5 average = (previous sum + x)/6 2.5 = (previous sum + x)/6 15 = previous sum + x x = 15 - previous sum
Wednesday, January 7, 2009 at 8:37pm by Damon

Math
∑2n+7 =2∑n + ∑ 7 =2*(20+1)(20/2) + 20*7 =420+140 =560
Tuesday, May 29, 2012 at 8:40pm by MathMate

Math(grade8) - corr.
Correction: The second column is the sum a²+b², the third is the sum c²+2d², and the fourth is the sum e²+3f². Another advantage of the exercise is that by the end of your work, you will be very familiar with all the primes under one hundred.
Thursday, September 24, 2009 at 4:50pm by MathMate

ALGEBRA
a) Sum(1 odd numbers) = 1 sum(first 2 odd numbers) = 1+3=4 sum(first 3 odd numbers) = 1+3+5 = 9 mmmhhh? they look like perfect squares sum(first 4 odd numbers) = 1+3+5+7 = 16 appears that sum(n odd numbers) = n^2 so Sum(first 60 odd numbers) = 60^2 = 3600 test it with an ...
Tuesday, May 29, 2012 at 8:59pm by Reiny

Math
Out of the numbers divisible by 3, we picked 4 consecutive numbers. To the sum of these, we added a third of the sum, and then the half of the third of the sum. We got 225. What are those 4 numbers?
Thursday, October 15, 2009 at 5:14pm by Joe

math
consecutive numbers are one value apart e.g. 5 6 7 or 123 124 125 if we let the first be x then the second is x+1 and the third is x+2 their sum = x + x+1 + x+2 = 3x +3 = 3(x+1 which means that the sum of any 3 consecutive numbers is always divisible by 3,since 3 is a factor. ...
Tuesday, October 6, 2009 at 7:15pm by Reiny

Math
Short-cut for sum/difference problems: Whenever the sum and difference of two numbers are both given, the bigger number is (sum+difference)/2, and the smaller number is (sum-difference)/2. (45+17)/2=31 (45-17)/2=14 Most of the time these problems can be solved without pen and ...
Thursday, May 31, 2012 at 12:23am by MathMate

ALG 2
Find the sum of the geometric series given.....(if their is no sum...state no sum) 3+9+27...
Tuesday, January 24, 2012 at 7:45pm by Embraced

Physics
sum(F) = m*a where sum(F) is the sum of the forces, m is mass, and a is acceleration: 30 - 20 = 50*a
Friday, November 9, 2012 at 1:44pm by Jennifer

math
http://www.bodybuilding.com/fun/calories.htm There is a calculator in the center column.
Friday, July 3, 2009 at 12:04pm by bobpursley

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