# 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 558170: I'm working with fraction exponents i.e. #roots. I know how to solve for the variable when it is an exponent, but this is a new lesson where I have to solve for the variable that is a base. This what I've tried, but I've hit a dead end. Problem: Step 1: or is it ---I got same bases on both sides of the equation and had 4^(3-24) subsitute my value for 40, since (4^3)=64, but I would have to subtract 24 from either the exponent or from the whole side of the equation. Here's where I hit a wall and I don't know what to do after that since I tried to do both of my alternatives. P.S. This is an excercise to get our feet wet for tomorrow's lesson. Click here to see answer by mananth(12270)

 Question 558346: The lengths of the three sides of a right triangle are given by three consecutive even integers. Find the lengths of the three sides. Click here to see answer by Alan3354(30993)

 Question 558345: The sum of the squares of two consecutive even integers is 1684. Find the two integers. Click here to see answer by Alan3354(30993)

 Question 558677: if the pattern 1 3 7 is contiued what would be the 5th term (1 3 7 ? ?) Click here to see answer by unlockmath(1602)

 Question 558751: What is the seventh term in this sequence 6,-18,54,-163... Thank you for your help I am really stuck. Click here to see answer by scott8148(6628)

 Question 558951: Try to solve this sequence 112 , 2112 , 2122 .... Calculate the further terms Click here to see answer by Edwin McCravy(8909)

 Question 559371: what's next 5 numbers in this sequence? 1, 6, 12, 17, 34, 39, 78... Click here to see answer by KMST(1868)

 Question 559630: what would the 7th pattern be to the following sequence: 1, 1+4=5, 1+4+9=14 Click here to see answer by solver91311(16897)

 Question 559368: what's next in this sequence? 1, 6, 12, 17, 34, 39, 78... Click here to see answer by richard1234(5390)

 Question 561862: The sum of 40 consecutive integers is 100 what is the largest integer Click here to see answer by Edwin McCravy(8909)

 Question 562209: What is the arithmetic sequence of 1, 1/4, 1/9, 1/16? Click here to see answer by richard1234(5390)

 Question 562232: What is the common difference in the arithmetic sequence of 1, 1/4, 1/9, 1/16? Click here to see answer by richard1234(5390)

 Question 562803: What is the nth term for this pattern?....... 2,8,18,32,50 Click here to see answer by scott8148(6628)
 Question 562803: What is the nth term for this pattern?....... 2,8,18,32,50 Click here to see answer by issacodegard(60)

 Question 563150: How can we show if the sequence αn = 2cos(nπ) is monotone or not? Click here to see answer by richard1234(5390)

 Question 563669: Are the sets equal? {4, 4, 11, 11, 17} = {4, 11, 17} Click here to see answer by jim_thompson5910(28595)

 Question 563844: find the missing number, n, in data set 28,n,2,19, and 28 mean = 19 Click here to see answer by prateekagrawal(56)

 Question 564340: I need to know the formula for adding whole numbers (1+2+3+4...) to get a sum over 1000. I know the answer is 45 but I need the formula to figure it out. Click here to see answer by ad_alta(240)

 Question 565548: find the sum of the first 30 terms of 4+7+10+13+16+19.... Click here to see answer by htmentor(789)

 Question 565635: Which number should come next at the end of this series: 1/12, 1/6, 1/3, 2/3? Possible answers: 3/4, 4/3, 3/2 Click here to see answer by ad_alta(240)

 Question 565988: write the first three terms of an arithmetic sequence if the fourth term is 10 and d=-3 Click here to see answer by Tatiana_Stebko(1326)

 Question 566162: The question is: what is the sum of 4+11+18+....+4001 I have been taught to add the first and last number, so i get 4005. Then I usually divide by half of the last number, which would be 2000.5 However, I know this only works if the numbers go up by one, not seven. This is where I get lost. Click here to see answer by richard1234(5390)

 Question 566625: Given the sequence 1331, 1000, 729, x, y, z, 125, . . . , what is the sum of x, y, z? Please show me the steps. Click here to see answer by richard1234(5390)

 Question 567485: A combination lock for a bicycle contains four digits, each of which can have a value of 0, 1, 2, 3 or 4. How many different sequences of numbers can open this lock? I came up with 120 digit combination. Click here to see answer by scott8148(6628)

 Question 567777: Suppose that the sum of two whole numbers is 20, and the sum of their reciprocals is 5/16. Find the numbers. Click here to see answer by stanbon(57361)

 Question 567791: sarah can shovel her driveway in 35 minutes. John can do the same job in 30 mintues. If they work together how many minutes would it take to shovel the driveway. I got as far at t/30+t/35=1 Click here to see answer by Earlsdon(6287)

 Question 567832: the 15th term in an arithmetic sequence is 43 and the sum of the first 15 terms of the series is 120. Determine the first three terms of the series Click here to see answer by solver91311(16897)
 Question 567832: the 15th term in an arithmetic sequence is 43 and the sum of the first 15 terms of the series is 120. Determine the first three terms of the series Click here to see answer by issacodegard(60)

 Question 568043: please explain how to find only thee sum of the odd numbers in sigma notation n=1-35 Click here to see answer by KMST(1868)

 Question 568401: Please help me in solving this arithmetic sequence.: The 21st term of the arithmetic sequence is -48, and the 33rd term is -84. Find the 101st term. Click here to see answer by htmentor(789)

 Question 568527: not getting the understanding of these problems and they need to be self explanatory to me. 8,11,14,17,20 1,16,81,256,625 5,15,45,135,405 2,7,12,17,22 1,1/2,1/4,1/8,1/16 Click here to see answer by jim_thompson5910(28595)

 Question 568427: How many terms are there in this sequence: 12,15,18,21.......267 Click here to see answer by richard1234(5390)

 Question 568967: write the first three terms of an arithmetic sequence if the fourth term is 10 and d=-3. Click here to see answer by scott8148(6628)

 Question 569333: the equation is 1+2+4+8..., n-6 i know the answer is 63 but idk how to get the answer and what formulas to use Click here to see answer by solver91311(16897)

 Question 570125: I am having issues with determining a of n when the only given are two terms from an arithmetic series. The two terms given are a of 8= 75 and a of 20= 75. What would a of n be?? Click here to see answer by htmentor(789)

 Question 570216: The sum of x and 5 is 16. Click here to see answer by jim_thompson5910(28595)

 Question 570818: 2. Which number should come next in the series? 1,4,9,16,25 27 34 36 45 I don't know Click here to see answer by KMST(1868)

 Question 570772: In the figure below, line m is parallel to line n, and line t is a transversal crossing both m and n. Which of the following lists has 3 angles that are all equal in measure? A. ∠a, ∠b, ∠d B. ∠a, ∠c, ∠d C. ∠a, ∠c, ∠e D. ∠b, ∠c, ∠d E. ∠b, ∠c, ∠e Click here to see answer by richard1234(5390)

 Question 571200: what is the 11th term of the geometric sequence 81,-27,9? Click here to see answer by Theo(3464)