# 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 345600: Number Sequence: 1. .75 is to 3/4 as .8 is to _______________ 2. 75% is to 1/2 as 45% is to __________ 3. 2 is to 50 as 3.2 is to _____________ 4. 14 is to 28 as 5 is to __________ 5. 1 is to 1/4 as 5/25 is to _________ 6. 0.35 is to 7 as 0.45 is to ________ 7. 1/3 is to 2/18 as 1/12 is to _______ 8. 3/8 is to 12/32 as 2/5 is to _______ 9. 1/3 is to 3/7 as 1/6 is to _________ 10. 1/3 is to 3/7 as 1/6 is to ________ 11. 0.4 is to 2/5 as 0.6 is to ________ 12. 0.2 is to 0.4 as 0.3 is to ________ 13. 8 is to 23 as 27 is to _________ 14. 0.5 is to 1/2 as 0.65 is to _______ 15. 1/3 is to 3 as 2/8 is to _________ 16. 30% is to 3/5 as 80% is to _______ 17. 0.30 is to 0.075 as 0.15 is to _______ 18. 2/5 is to 20% as 3/4 is to _________ 19. 625 is to 81 as 5 is to __________ 20. 8 is to 11 as 36 is to __________ 21. 2 is to 2.5 as 4 is to __________ 22. 2 is to 8 as 4 is to __________ Please help me answer these number series. I also need the solutions on how the answers are being solved. I definitely need this for my homework. Thank you so much for all that you do for us students who are having difficulty in Math. Click here to see answer by JBarnum(2044)

 Question 345743: Number Series 1. 75% is to 1/2 as 45% is to __________ 2. 2 is to 50 as 3.2 is to _____________ 3. 14 is to 28 as 5 is to __________ 4. 1 is to 1/4 as 5/25 is to _________ 5. 0.35 is to 7 as 0.45 is to ________ Click here to see answer by rfer(12654)

 Question 345751: find the sum of the geomtric series 81-27+9... to 6 terms Click here to see answer by checkley77(12569)

 Question 346582: Hello I seem to be stuck at this problem. I'm not to sure how to write it as the n and n-1 are subscripts. Show that an = Sn – Sn-1 Click here to see answer by Theo(3458)
 Question 346582: Hello I seem to be stuck at this problem. I'm not to sure how to write it as the n and n-1 are subscripts. Show that an = Sn – Sn-1 Click here to see answer by Fombitz(13828)

 Question 346370: Find the nth term formula for the arithmetic sequence; 11,21,31..... Click here to see answer by scott8148(6628)

 Question 347669: find using algebra the first five terms of the sequence when the 99th and 100th in the sequence are 351 and 353 Click here to see answer by Fombitz(13828)

 Question 347619: 1. . List the terms that complete a possible pattern in each of the following: (a) 38, 33, 28, 23, 18, ____, ____, ____ (b) 640, 320, 160, 80, ____, ____, ____ (c) 7, 8,15, 23, 38, ____, ____, ____ (d) 4, 8, 16, 32, 64, ____, ____, ____ (e) 1, ____, ____, ____, 25, 36, 49 Click here to see answer by checkley77(12569)

 Question 347947: use summation notation to write the series: 1- 1/2+ 1/4- 1/8+ ...- 1/128 Click here to see answer by ewatrrr(10682)

 Question 348152: Find the first five terms of the sequences with the nth term given as follows: (a) 5n + 5 ________, ________, ________, ________, ________ Click here to see answer by ewatrrr(10682)

 Question 348207: describe the pattern in the numbers 2,20,10,100,50 and list the next number Click here to see answer by Edwin McCravy(8893)

 Question 349508: find the missing sequence 2 _ _ _ _ 2048 using multiplication thanks Click here to see answer by Alan3354(30993)

 Question 349594: Please help me to find the first five terms of the following recursively defined infinite sequence. a1=2 (1 represents the input value of term number) ak+1=3ak-5 (k+1,k represents the input value of term number) TQ. Click here to see answer by stanbon(57290)

 Question 349738: The expression x squared can be used to find the nth term in a sequence. What is the 5th term in that sequence? A.)31 B.)25 C.)16 D.)7 Click here to see answer by jim_thompson5910(28536)

 Question 350060: what is the least number to be added to 2000 to make it a perfect square? please sir help me to solve the question . with explaination. Click here to see answer by mananth(12270)

 Question 350542: I wouldd like to know how to figure out the long term of a recursive formula Click here to see answer by nyc_function(2733)

 Question 350804: The Fibonacci numbers are shown below 1,1,2,3,5,8,13,21,34,55,89,....... write the next three numbers in the pattern Click here to see answer by checkley77(12569)

 Question 351009: Find the next three numbers in the geometric sequence −1, −3, −9, ... Click here to see answer by stanbon(57290)

 Question 351198: find a number whos product with 9 is the same as its sum with 56 Click here to see answer by rfer(12654)

 Question 351645: Write the first six terms of each of the sequences whose nth term is n/2[(-1)^n + 1] Click here to see answer by ewatrrr(10682)

 Question 351303: Solve: Find a number that is 96 greater than its opposite. x=the number -x=opposite x=96+-x Is this right so far? What do I do next? Thanks Click here to see answer by ankor@dixie-net.com(15646)

 Question 352077: Can you help me please? I will appreciate your answer. Exercise: The sum of the infinite geometric series (x-1)+(x-1)^2+(x-1)^3+ ... is 1/3. Determine the Value of "x". Thank You! Click here to see answer by Jk22(389)

 Question 352080: Would you mind helping me with this exercise, please. Thank You! Use sigma notation to express the following infinite geometric sum and then evaluate the sum to two decimal places. 8+(-6)+4.5+(-3.375)... Click here to see answer by Fombitz(13828)

 Question 352061: The first swing of a bob on a pendulum is 10 inches.If on each subsequent swing it travels 0.9 as far as on the preceding swing,how far will the bob travel before coming to rest? Click here to see answer by Fombitz(13828)

 Question 352135: if the sum of two numbers is 2 and the difference is 12 what are the numbers? Click here to see answer by sudhanshu_kmr(1152)

 Question 352134: If the sum of two numbers are 110 and the difference is 20 what are the two numbers? Click here to see answer by Jk22(389)

 Question 352188: What would be an algebraic expression for the sequence 1,3,6, 10, 15, 21 and so on? Click here to see answer by Fombitz(13828)

 Question 352174: What do the numbers have in common? 44, 62, 71, 80, 116, 2,222 Click here to see answer by ewatrrr(10682)

 Question 352579: On a map, two cities are 2 5/8 in apart.If 3/8 in on the map represents 25 mi. Find the number of miles bewteen the two cities? This problem seems really simple but I just can't figure it out right. Hope you can help! Thank you! Click here to see answer by mananth(12270)

 Question 352546: (9^-2)^-5= thank u so much for any help u can provide me with Click here to see answer by Fombitz(13828)

 Question 352283: Can you help me please? Thank you very much! _I appreciate it! This is the exercise: Without solving for the number of terms, determine the sum of the series, below, using a formula. Do not round answer, please. 144+72+36+...+0.5625 Click here to see answer by scott8148(6628)

 Question 353367: solve the inequalities for x 3-x>0 4x +8<0 7x NEG-21>0 10-2x<0 Thank you twolittleone@peoplepc.com Click here to see answer by edjones(7569)

 Question 353570: The third and fourth terms of a sequnce are 26 and 40. If the second differences are a constant 4, what are the first five terms of the sequence Click here to see answer by Edwin McCravy(8893)

 Question 353138: what's the first five term of the sequence : tn = 3n-4 Click here to see answer by JBarnum(2044)

 Question 353859: Find the nth term of the sequence +1, -4, +9, -16, +25, … plese sent to my email quickly,,iam waiting for your answer Click here to see answer by ewatrrr(10682)

 Question 354103: how does one solve piecewise functions f(x)x+4 if x is greater or less than -4 -(x+4) for x is less than -4 Click here to see answer by stanbon(57290)

 Question 354641: the first difference of a sequence is 2, 3, 4, 5,... The sum of the first two terms of the original sequence is 16. What first three terms of original sequence? Click here to see answer by Edwin McCravy(8893)

 Question 354774: ___/___*___+___*___*___/___+___*___=100 and you can only use 1 thru 9 once. Click here to see answer by jim_thompson5910(28536)