







Progression arithmétique 
20080108 

parrot pose la question : Bonjour je suis en 6ème et j'ai besoin d'aide pour un problème de math.
Donc voila mon problème :
Un renard a mangé 100 grains de raisins pendant une periode de 5 jours.
Chaque jour, il a mangé six grains le plus que le jour précédent.
Quel est le nombre de grains mangés le premier jour ? Claude Tardif lui répond. 





An arithmetic sequence 
20190223 

Dalal pose la question : If x+1 and x+17 are the second and sixth term of a sequence with a common difference of 5, what's the value of x. Penny Nom lui répond. 





An arithmetic sequence 
20190131 

sara pose la question : if the 6th term of an arithmetic sequence is 8 and the 11th term is 2, what is the first term? Penny Nom lui répond. 





A geometric progression 
20160303 

Pauline pose la question : A woman measures the height of her child at birth and at monthly intervals afterwards.The child's height increases by 5% per month. Find the number of measurements she has made before the child's height is twice what it was at birth Penny Nom lui répond. 





1 + 2 + 3 + ... + (2n  1) 
20150101 

Brian pose la question : Hi Maths Central
My wife presented me with a query which may have a simple answer, but one that I can’t deduce or explain.
Take the string of numbers, n=1,2,3,4,5…
It seems that n(2n1) = Sum((1…..(2n1))
e.g. for n=5, both 5 x 9 and Sum(1….9) equal 45, and so on for other values of n.
Could you please provide an explanation? Does it have an underlying reason and a name?
Look forward to your response.
Brian Penny Nom lui répond. 





An arithmetic progression 
20141119 

Gbenga pose la question : In an A.P the difference between 8th and 4th term is 20. The 8th term is 1\2 times the 4th term . Find arithmetic progression.. Penny Nom lui répond. 





The sum of the first 50 terms of an arithmetic progression 
20140726 

Joshua pose la question : Hello ...my is Joshua...I'm a grade 11 student...I got a question
Calculate the sum of the first 50 terms of an arithmetic progression: 112:98:84 Penny Nom lui répond. 





An arithmetic progression 
20140331 

Japheth pose la question : The 3rd term of an A.P is 10 more than the first term while the fifth term is 15 more than the second term. Find the first term? Penny Nom lui répond. 





An arithmetic sequence 
20140106 

paris pose la question : find the twentyfifth term of an arithmetic sequence whose first term is 12 and whose common difference is 6 Penny Nom lui répond. 





An Arithmetic Progression 
20131008 

collins pose la question : In an A.P. the difference between the 8th and 4th term is 20 and the 8th is one and half times the 4th term... what is the common difference and the first term Penny Nom lui répond. 





The sum of all whole numbers from 1 to X 
20130906 

Tim pose la question : How do I develop a rule for the sum of all whole numbers from 1 to X when I have no idea how to do this Penny Nom lui répond. 





An arithmetic progression 
20130706 

ashok pose la question : the 4th and 10th term a.p respectively 7 and 19 find its 15th term..... Penny Nom lui répond. 





An arithmetic progression 
20130206 

loberto pose la question : the 3rd term of an a.p is 10more than the 1st term,while the 5th term is 15more than the 2nd term,find the sum of the 8th and 15th terms of the a.p if the 7th term is 7times the 1st term Penny Nom lui répond. 





An arithmetic progression 
20120822 

A student pose la question : the 3rd term of an A.PPP is 10 more than the first term while the 5th term is 15 more than the second.find the sum of the 8th and 15th terms if the 7th term is 7 times the first term. Penny Nom lui répond. 





A tree growth modelled by a geometric series 
20120208 

Steph pose la question : Hi I am really struggling with this question please help !!!!
a pohutukawa tree is 86 centimetres when it is planted. in the first year after it is planted , the tree grows 42 centimetres in height.Each year the tree grows in height by 95% of the growth of the previous year.
assume that the growth in height of the pohutukawa tree can be modelled by a geometric sequence.
A)find the height of the tree 5 years after it is planted and figure out the maximum height the pohutukawa tree is expected to reach in centimetres Penny Nom lui répond. 





1 + 3 + 3^2 ...+3^(n1) = 3^n  1/2 
20120127 

Vicki pose la question : I am trying to find out how to do show how this proof was worked.
Here is the end result 1 + 3 + 3^2 ...+3^(n1) = 3^n  1/2
This equation was used to find the number of white triangles in the Sierpinski Triangle Walter Whiteley lui répond. 





The 3rd term of an A.P is 10 more than the first term 
20111129 

Olaniyan pose la question : the 3rd term of an A.P is 10 more than the first term while the fifth term is 15 more than the second term. Find the sum of the 8th and 15th terms of the A.P if the if the 7th term is 7 times the first term. Penny Nom lui répond. 





A geometric progression 
20101215 

Abeth pose la question : find the value of x so that 2(x1), x+3, x will be a geometric progression. Penny Nom lui répond. 





The value after 30 years 
20101215 

Abeth pose la question : At the end of every year, the owners of a building which costs 2, 500, 000 pesos deducts 15% from its carrying value as estimated at the beginning of the year. find the estimated value at the end of 30 years. Penny Nom lui répond. 





A geometric progression 
20100430 

Kalyani pose la question : sum of infinite geometric progression is 9 and common ratio is 1/10
then sum up to 8 terms is? Chris Fisher lui répond. 





4 + 10 + · · · + (6n − 2) 
20100421 

Lan pose la question : Find the sum 4 + 10 + · · · + (6n − 2). The answer is 3(n^2) + n. How? Penny Nom lui répond. 





A sequence 
20090526 

Jay pose la question : what is the equation that would give me the next 3 numbers in this progession: 0,1,5,14,20 Stephen La Rocque lui répond. 





A geometric progression 
20090516 

sweta pose la question : find the ratio of GP if the first term is 1 and the sum of third and fifth term is 90. Penny Nom lui répond. 





Arithmetic progressions 
20060131 

A student pose la question : 1)the sum to n terms of a particular series is given by S_{n}=17n3n^{2}
a)find an expression for the n term of the series
b)show that the series is an arithmetic progression
2)a particular arithmetic progression has a positive common difference and is such that for any three adjacent terms ,three times the sum of their squares exceeds the square of their sum is 375.Find the common difference
Penny Nom lui répond. 





Three prime numbers p,q and r, all greater than 3, form an arithmetic progression: 
20050718 

Ladis pose la question : Three prime numbers p,q and r, all greater than 3, form an arithmetic progression: p=p, q=p+d and r= p+2d. Prove that d is divisible by 6. Chris Fisher lui répond. 





An arithmetic progression 
20041224 

A student pose la question : the 4th and 5th term of an arithmetic progration 47 and 52 respactively find
a)d
b)a1
c)a50 Penny Nom lui répond. 





1+3+5+...+(2n+1) 
20040910 

Emma pose la question : Prove that 1+3+5+...+(2n+1)= (n+1)^{2} Penny Nom lui répond. 





The sum of some positive integers 
20040607 

A student pose la question : Find the sum of all positive integers not greater than 10000 that are divisible by neither 3 nor 7. Penny Nom lui répond. 





Geometric sequences 
20040203 

Alan pose la question : hello, I am a junior in precalculus. we started working on geometric sequences today, it makes perfect sense on how it works. but why is it called that? if you could send me an answer to why geometric sequences have that name, I would be much appreciative. Chris Fisher lui répond. 





7+8+9+...+1000 
20020911 

Shirley pose la question : My question is what is the formula for adding up numbers when you don't start with number 1? For example 3 + 4 + 5 + 6 = 18. But how could you arrive at the answer without adding all the numbers? Penny Nom lui répond. 





Arithmetic progressions 
20020424 

David pose la question : I have been searching everywhere for the formula to mathamatical progression. Penny Nom lui répond. 





Arithmetic sequences 
20010910 

Rachel pose la question : I can't seem to figure out a problem that deals with arithmetic sequencing. This is the question: The 5th term in an arithmetic sequence is 1/2, and the 20th term is 7/8. Find the first three terms of the sequence. I attempted this problem with the formula: An = a + (n1)d (where the n represents the nth term, a is the first term, and d represents the common difference) I keep getting 9.5 for the first number, and then 3/120 as the common difference between the numbers. But as I have figured it, the sequence is getting greater and greater, and my data does not go with the terms given. Penny Nom lui répond. 





Geometric and arithmetic sequences 
20010126 

Garry pose la question : what are the equations for geometric and arithmetic sequences? also, what are the equations for finding the sums of those series? Leeanne Boehm and Penny Nom lui répond. 





Arithmetic Progressions 
19981112 

Gerry Boser pose la question : It has been years since I was in school and I can't remember if there is a formula for the following problem: If you deposit $1.00 on the first day of the month, $2.00 on the second day, $3.00 on the third day . . $31.00 on the last day of the month, how much do you have in the bank? Now will this formula also work if it was, $0.25 (then day two you would deposit 2x $0.25 or $0.50, day three you would deposit 3x $0.25, $0.75. . . ). Will it work with any denomination?? Thank you for your time. I promise I'll write this one down for future reference. . . Penny Nom lui répond. 





Dividing a Class 
19981001 

Tom Barker pose la question : My eighth grade niece called with the following homework problem: A teacher wanted to divide her class into equally numbered groups. She tried to divide the class into groups of two, but was one student short. She tried to divide the class into groups of five, but was one student short. She tried to divide the class into groups of seven and was successful. What is the least number of students that were in her class? I know the answer is 49, but don't know how to prove it. I must be getting old if I can't solve eighth grade math problems. Your assistance would be appreciated. Penny Nom lui répond. 

