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

Tutors Answer Your Questions about Sequences-and-series (FREE)

Question 1118114: The angles of a polygon are 172,164,156and are in arithematic sequence.Find the sequence of exterior angles and the number of sides.
Click here to see answer by greenestamps(13200)

Question 1118104: The common difference and last terms of an A.p are 0.8 and 21.8 respectively.if there are 23 terms in the sequence,find its first term
Click here to see answer by stanbon(75887)

Question 1118156: I need the formula used

n 1,2,3,4
f(n) 4,8,12,16
Click here to see answer by josgarithmetic(39618)

Question 1118156: I need the formula used

n 1,2,3,4
f(n) 4,8,12,16
Click here to see answer by ikleyn(52788)

Question 1118155: Hello I need to get the formula of this sequences
n 1, 2, 3, 4
f(n) 5, 7, 9, 11
Click here to see answer by josgarithmetic(39618)

Question 1118204: 10. Evaluate the following. Show your work using concepts from this unit.
a) 1 - 3 + 5 - 7 + 9 -11 + ... + 201 - 203
b) 300 - 299 + 298 - 297 + ... + 100 - 99
Click here to see answer by math_helper(2461)

Question 1118231: what are two arithmetic mean between -31 and -10
---------
The difference is 21
2 means between --> 3 intervals.
Make an effort.

Click here to see answer by Alan3354(69443)

Question 1118234: An ap consists 25 terms, of which 4th term is 4 and 22nd term is 5.what would be the 19th term?
Click here to see answer by josgarithmetic(39618)

Question 1118234: An ap consists 25 terms, of which 4th term is 4 and 22nd term is 5.what would be the 19th term?
Click here to see answer by greenestamps(13200)

Question 1118291: what is the sum of the geometric series, rounded to the nearest whole number?
16E(n-1) 6(1/4)^n
Click here to see answer by greenestamps(13200)

Question 1118352: Please help me solve this question
U r asked by ur elderly neighbour to lay a stone path from the back door of her house to the bird feeder 44 units across her backyard.Each unit is 500mm.she purchased 15 crircular stones,each 1 unit wide in diameter,and would like u to place them equally spaced across the backyard with the last stone touching the feeder.The distance from the house to the first stone is up to you,so you may make it different to the spacing between the stone.Before going to her house to do the work, you have decided to make a plan.
1) how far apart would you lay the stones to use all 15 to reach the bird feeder?
2) How much space would you leave between the house and the first stone?
3) How far will the house be from the near side of the third stone?
4) How far will the house be from the near side of the fifth stone
5) The tenth stone? The fourteenth stone?
6) Describe the method or methods you used to answer number 3-5
7) Build a table to show how far each of the fifteen stones will be from the house. One column would be numbered 1 to 15.
8) The second column would show the distance from the house to the to the first stone, from the house to the second stone, etc.
9) Find an equation that describes the relationship.

Click here to see answer by greenestamps(13200)

Question 1118368: What is the first five terms of
an=n+4
an=2n-1
an=12-3n
an=3^n
an=(-2)^n
Plsss help me solve this question
Thank you
Click here to see answer by josgarithmetic(39618)

Question 1118377: What are the first three terms if the 11th term of an
arithmetic sequence is 60 and the sum of the first 11
terms is 55?

Click here to see answer by Edwin McCravy(20056)

Question 1118497: Find the next number
54,46,39,29,23,20,()
Click here to see answer by josgarithmetic(39618)

Question 1118497: Find the next number
54,46,39,29,23,20,()
Click here to see answer by Shin123(626)

Question 1118499: Please help me solve this question:Give the next three terms of the sequence -8,-5,-2,1?
Click here to see answer by Theo(13342)

Question 1118560: Find the next number in the sequence
1,15,169,1695 ?
Click here to see answer by rothauserc(4718)

Question 1118560: Find the next number in the sequence
1,15,169,1695 ?
Click here to see answer by greenestamps(13200)

Question 1118575: this is my question
59,724,887,103,876,696,248,221,253,204,739,939,266,?
Please give solution for it. i am solving this problem about 5 hours.
If any one find solution for it, please give me explanation how it was.
Click here to see answer by josgarithmetic(39618)

Question 1118721: what is the 50th term of -5 -2 1 4 sequence

Click here to see answer by josgarithmetic(39618)

Question 1118741: Please help me to solve this numbers 50,51,52...70 using this formula SN=N/2(a1+an)
Click here to see answer by josgarithmetic(39618)

Question 1118741: Please help me to solve this numbers 50,51,52...70 using this formula SN=N/2(a1+an)
Click here to see answer by ikleyn(52788)

Question 1118776: The 13th term of a sequence is 44.Construct an explicid arithmetic sequence formula?
Click here to see answer by solver91311(24713)

Question 1118782: sum from n = 1 to n = infinity(2^n - 1)/3^n
Click here to see answer by solver91311(24713)

Question 1118782: sum from n = 1 to n = infinity(2^n - 1)/3^n
Click here to see answer by greenestamps(13200)

Question 1118758: A sequence defined by
an={1 n=1
an={cos(1/24pi-1/4(an-1)) n>1
what is a102?
an=nth term in the sequence
Click here to see answer by greenestamps(13200)

Question 1118801: Hi i need help please.I have a grid square for daughters homework and cant help her do it.
A + B = C
+ + +
C + D = A
= = =
C + A = 13
MANY THANKS
Click here to see answer by Alan3354(69443)

Question 1118805: find the sum of all integers that are multiple of 4 from 1 to 150

Click here to see answer by htmentor(1343)

Question 1118803: the sum of the fist 10 term of an arithmetic sequence is 530. what is the first term is 80? what is the common difference?

Click here to see answer by ikleyn(52788)

Question 1118835: How to use the nth term of a geometric sequence to find the value of k. So the terms k-3, k+1, and 4k-2 form a geometric sequence.
Click here to see answer by ikleyn(52788)

Question 1118887: find the next four terms of -9,-2,5,...
find the next four terms of 0,7,14,...
find the next four terms of x,2x,3x,...
find the next four terms of 5k,-k,-7k,...

Click here to see answer by solver91311(24713)

Question 1118895: Next number in the series 0.1, 0.25, 0.3, 0.2, 0.5, 0.6, 0.3, _, 0.9, 0.4, 1.0, 1.2
Click here to see answer by solver91311(24713)

Question 1118895: Next number in the series 0.1, 0.25, 0.3, 0.2, 0.5, 0.6, 0.3, _, 0.9, 0.4, 1.0, 1.2
Click here to see answer by t0hierry(194)

Question 1119057: 2 , 6, -18, -54, ... What will be the next term. What will be the formula?

Click here to see answer by greenestamps(13200)

Question 1119057: 2 , 6, -18, -54, ... What will be the next term. What will be the formula?

Click here to see answer by ikleyn(52788)

Question 1119056: 2 , 6, -18, -54, ...
Click here to see answer by Alan3354(69443)

Question 1119093: Find the 9th term of the arithmetic sequence with
Click here to see answer by Alan3354(69443)

Question 1119106: find the summation notation:
1+3+9+27+81+243
Click here to see answer by josgarithmetic(39618)

Question 1119155: 5,6,9,20,?,414
A)96 B)108 C)75 D)192
Click here to see answer by josgarithmetic(39618)

Question 1119155: 5,6,9,20,?,414
A)96 B)108 C)75 D)192
Click here to see answer by Alan3354(69443)

Question 1119155: 5,6,9,20,?,414
A)96 B)108 C)75 D)192
Click here to see answer by greenestamps(13200)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790