# Questions on Algebra: Sequences of numbers, series and how to sum them answered by real tutors!

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 Algebra: Sequences of numbers, series and how to sum them Solvers Lessons Answers archive Quiz In Depth

 Question 496465: 5,_,_,8,_,10 How to find the pattern for this? Click here to see answer by richard1234(5390)

 Question 497222: the formula you use to find the sum of 1-1000 1+2=3+3=6+4=10+5=15 ..... Thank you! Click here to see answer by bucky(2189)

 Question 497220: the formalua you use to find the sum of 1-1000 1+2=3+3=6+4=10+5=15 ..... Thank you! Click here to see answer by Earlsdon(6294)

 Question 497302: List all irrational numbers. __ Consider the following: -83,-4.7,0,5/9,2.16,pie,square root 17,62 Click here to see answer by stanbon(57984)

 Question 497688: using the infinite series equation, explain how .9 repeating equals one. I tried to do it by myself, but I cannot figure it out. Please help me, but not give me a direct answer. Click here to see answer by MrMitchell(3)

 Question 498219: the reciprocal of two more then a number is three times the reciprocal of the number. find the number? Click here to see answer by lmeeks54(105)

 Question 498654: What is this 1/2n means one blank of a number? Click here to see answer by Earlsdon(6294)

 Question 498919: The number of counties in California and the number of counties in Montana are consecutive even integers whose sum is 114. if California has more counties than Montana how many counties does each state have Click here to see answer by Mr_Schuler(2)

 Question 498943: Hello: I am working on a practice test and it would be dishonest of me to ask you the same question. However, I am having a horrible time discerning how to write a recursive pattern. I know how to find the pattern, no problem, see that right away, but when it comes to figuring out the pattern I get a mental block. Is there a resource you can recommend to me to sort this out? I would be happy to study it as I want to understand this. Tina Click here to see answer by chessace(471)

 Question 498611: what are the next three numbers in this sequence? 0.1, -1, 10, -100 Click here to see answer by bucky(2189)

 Question 500578: n an 1 2 2 6 3 14 4 30 5 62 Look at the sequence in the table. Which recursive formula represents the sequence shown? Click here to see answer by scott8148(6628)

 Question 500627: what is the sum of the sequence? 33+34+35+36+...+104 Click here to see answer by xdragonfight(116)

 Question 500725: Find the Difference of the 120th and 123rd term of the following sequence -3, -1, 1, 5,7,9 Click here to see answer by richard1234(5390)

 Question 501418: The sum of the first 12 terms of an arithmetic series is 186, and the 20th term is 83. What is the sum of the first 40 terms? Click here to see answer by Edwin McCravy(8999)

 Question 501518: What is the ratio of the nineteenth term to the twentieth term?????? 1,-3,9,-27,... Click here to see answer by josmiceli(9817)

 Question 501801: Write a recursive rule for the sequence 36,18,9.... Thanks Click here to see answer by jim_thompson5910(28717)

 Question 502517: Binomial Theorem Find the specified term of eah equation 12th term of (13x-4y) There is supposed to be a exponent of 11 after the last parinthecy Click here to see answer by Alan3354(31538)

 Question 502515: The problem is, Write an equation for each of the following sequences.I would try but I have no idea. Here is one of them: A3=24 A5=96 Click here to see answer by Alan3354(31538)

 Question 503195: Find a number whose product with 7 is the same as its sum with 24. Click here to see answer by josmiceli(9817)

 Question 503508: If I have the following numbers: 2,6,12,20,30,42... I can see the relationship between the numbers: +4 +6 +8 +10 +12 +2 +2 +2 +2 What kind of sequence is this? (arithmetic/geometric etc) Thank you! Click here to see answer by MathLover1(6815)

 Question 504624: What is the sum of the first 50 terms of the arithmetic sequence 6,11,16,21... Click here to see answer by Maths68(1474)

 Question 504792: if you subtract -46 from twice a number, the result is 548. What is the missing number Click here to see answer by rfer(12731)

 Question 506016: Suppose the first term of an arithmetic sequence is 3 and the one hundredth term is 795. What is the common difference? Click here to see answer by htmentor(809)

 Question 506084: write the series with summation notation -3 + 3 +9 + 15 +21 +... Click here to see answer by Tatiana_Stebko(1326)

 Question 465514: The Fundamental Counting Principle states that the number of ways in which a series of successive things can occur is found by multiplying the number of ways in which each thing can occur. That is, if first event E1 can occur in M1 different ways and after E1 has occurred, if event E2 can occur M2 different ways, then total number of ways that two events can occur is M1*M2 1.Based on this principle, how many different Social Security numbers are possible? 2.Can you find out how many telephone numbers are possible within any area code? 3.Try following problem using Fundamental Counting Principle. A typical alarm code is unarmed with the correct sequence of three numbers between 0 and 49 inclusive. If a burglar takes one second to try one sequence of alarm code, how long (in hours) will take for a burglar to try all possible sequences? Is this alarm code systems deterrent enough to keep burglars away? Click here to see answer by Ashlynbyrd(1)
 Question 465514: The Fundamental Counting Principle states that the number of ways in which a series of successive things can occur is found by multiplying the number of ways in which each thing can occur. That is, if first event E1 can occur in M1 different ways and after E1 has occurred, if event E2 can occur M2 different ways, then total number of ways that two events can occur is M1*M2 1.Based on this principle, how many different Social Security numbers are possible? 2.Can you find out how many telephone numbers are possible within any area code? 3.Try following problem using Fundamental Counting Principle. A typical alarm code is unarmed with the correct sequence of three numbers between 0 and 49 inclusive. If a burglar takes one second to try one sequence of alarm code, how long (in hours) will take for a burglar to try all possible sequences? Is this alarm code systems deterrent enough to keep burglars away? Click here to see answer by solver91311(17077)

 Question 506548: what is the explicit formula for the sequence 10,12,15,19,24 Click here to see answer by Gogonati(817)

 Question 507557: Consider the arithmetic series 7+19+31+43+55+..... What is the maximum number of terms for a sum of the series less than 1000? What is the maximum number of terms for a sum of the series less than 2000? Click here to see answer by Edwin McCravy(8999)

 Question 508190: Im having problems with recursive sequences (An= 3an-1), my secuence is 5,15,45,135... and im trying to make sure how to get 15 with these formula Click here to see answer by stanbon(57984)
 Question 508190: Im having problems with recursive sequences (An= 3an-1), my secuence is 5,15,45,135... and im trying to make sure how to get 15 with these formula Click here to see answer by tinbar(128)

 Question 508093: given the 5 th term, what is the 50 th term? Click here to see answer by richard1234(5390)

 Question 508404: Prove that the sequence 1/ sqrt ( n ) tends to zero. Click here to see answer by richard1234(5390)

 Question 508360: if 12th and 25th term of an airthmetic progression are 40 and 131 .then what is the 50th term Click here to see answer by Maths68(1474)

 Question 506885: consider an arithmetc sequence whose fourth entry is 2 and whose seventh entry is 4. find the first and second entries of the sequence. Click here to see answer by Maths68(1474)

 Question 509295: write the recursive formula for sequence whose first three terms are 1,1, and 3? Click here to see answer by richard1234(5390)

 Question 510283: a local toy store sells whistles in packages of 10,20, or 40. if you need 100 whistles for a party, in how many different combinations can you buy them? Click here to see answer by Edwin McCravy(8999)

 Question 511867: Can you aolve this equation, and give me the steps, -3(z+5)=15 Click here to see answer by rfer(12731)

 Question 512217: The sum of 6 terms of an arithmetic series is 45, the sum of 12 terms is -18. Find the first term and the common difference. Click here to see answer by Edwin McCravy(8999)

 Question 512458: This is all the information I was given and I've been trying to figure it out for hours. The slope of the line is -2/3, but the numbering on the x axis is missing, How many units should each tick mark on the x axis represent? Click here to see answer by Alan3354(31538)

 Question 512608: 5,5,6,8,11,15 what is the 20th term and 21th Click here to see answer by Edwin McCravy(8999)

 Question 513048: whats a number whose product with 6 is the same as its sum with 60. Click here to see answer by Maths68(1474)
 Question 513048: whats a number whose product with 6 is the same as its sum with 60. Click here to see answer by Tatiana_Stebko(1326)

 Question 512989: Evaluate : 1+ (1+2) +(1+2+3) + (1+2+3+4) +............(1+2+.....100) Click here to see answer by Edwin McCravy(8999)

 Question 513042: If Y = 1/X , write down the value of Y, correct to 2 decimal places, when X = 8 Click here to see answer by umail08(87)

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