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 970655: Can u solve this?
_ + _ =30
Fill the boxes using
( 1,3,5,7,9,11,13,15 )

Click here to see answer by Alan3354(69443)

Question 970636: The function f(x)=6x+1 is one to one.
a.) Find the inverse of f.
b.) Graph f, f^-1, and y=x on the same set of axes.

Anyone that can help me...
Click here to see answer by khai(18)

Question 970629: What is the nth term of the geometric sequence that has a common ratio of 6 and 24 as its third term?
Click here to see answer by khai(18)

Question 970639: solve the equation.
log 1/5(x^2+x)- log 1/5(x^2-x)=-1
Click here to see answer by MathTherapy(10552)

Question 970618: an arithmetic sequence formed of 11 terms ,its middle term equals 20. find the sum of it's terms ,and find a sequence which verifies the equation.

Click here to see answer by josgarithmetic(39618)

Question 970720: I need to learn how to tell the difference between converge and diverge
Click here to see answer by Theo(13342)

Question 970753: What is the 5th term of the following arithmetic sequence: -3x-8, 2x-1, 7x+6
Click here to see answer by stanbon(75887)

Question 970752: Could you please find the 10th term of the geometric sequence below?
-7x^7, 28x^9, -112x^11
Click here to see answer by stanbon(75887)

Question 970761: Find the 7th term of the geometric sequence -9x^6 . . . 27x^8 . . . -81x^10
Thanks a ton!
Click here to see answer by josgarithmetic(39618)

Question 970763: complete the pattern
9, 1, 11, 5, 13, 19, ...
what would be the last number and why?
Click here to see answer by AnlytcPhil(1806)

Question 970884: How can I write the following sequence in sigma notation? 6+16+26+36?
Click here to see answer by MathLover1(20850)

Question 970884: How can I write the following sequence in sigma notation? 6+16+26+36?
Click here to see answer by MathTherapy(10552)

Question 970966: if the sequence number is 17, and 3 is the second number, what is the first number?
Click here to see answer by josgarithmetic(39618)

Question 971312: Cual es el n-esimo termino de la sgte sucesion: 3,5,9,17,33...
Click here to see answer by rothauserc(4718)

Question 971325: Select the option for "?" that continues the pattern
2,7,26,101,400,?
7,16,8,27,9,?
7,21,8,72,9,?
Click here to see answer by Edwin McCravy(20056)

Question 971319: 2500,500,100 next three geometric terms
Click here to see answer by Edwin McCravy(20056)

Question 970964: Plz help in solving the series..
16, 6, 68, 88,_, 98
Click here to see answer by Edwin McCravy(20056)

Question 971439: 4,9,13,22,35

Click here to see answer by amarjeeth123(569)

Question 971448: The number of the sequence is 17, if the second number is 3 what is the first number???
In other words they are 17 numbers in the sequence and the second number is 3. So what is the first number. Help and solve this for me. U can as well email me at tugumisirizejonan95@gmail.com THANK YOU
Click here to see answer by Edwin McCravy(20056)

Question 971618: What is the 5th term of the geometric sequence 9,4,6 ..
Click here to see answer by josgarithmetic(39618)

Question 971632: what is the common ratio for the sequence {8,24,72,216}?
Click here to see answer by Horlaye(27)

Question 971320: 2500,500,100 What are the next three geometric terms.

Click here to see answer by Edwin McCravy(20056)

Question 971691: if the number of sequence is 17 the next number is 3,what is the first number ?
Click here to see answer by Alan3354(69443)

Question 971889: Find x if the sequence 8, x, (5/2)x is geometric.
Thank you so much!
Click here to see answer by nerdybill(7384)

Question 971996: What is the next number in the sequence?
3, -6, 12, 4, 20, ?
Click here to see answer by checkley77(12844)

Question 971993: find the 1st term of a sequence whose number is 17 and its 2nd term is 3
Click here to see answer by stanbon(75887)

Question 971947: Evaluate f(x)=-2x^2-4forx=3
Click here to see answer by Alan3354(69443)

Question 971946:
Click here to see answer by farohw(175)

Question 972094: find the 1st term of a sequence whose ?? number is 17
and its 2nd term is 3
Click here to see answer by josgarithmetic(39618)

Question 972088: Assume 1^2 + 2^2 + 3^2 +... n^2 = (n(n+1)(2n+1))/6 is true for all positive integers n. If we replace the right hand side with ((n+2)(n+3)(2n+5))/6 , what term(s) do we add to the left hand side?
I believe the correct answer is (n+1)^2 but I want to double check
Click here to see answer by Edwin McCravy(20056)

Question 972097: The fifth term of an Arithmetic progression is 24 and the sum of the first five terms is 80, find the first term common difference and the sum of the first fifteen terms of the A.P
Click here to see answer by josgarithmetic(39618)

Question 972099: The first term of an Arithmetic progression is 3, find the common difference if the sum of the first eight terms is twice the sum of the first five terms
Click here to see answer by josgarithmetic(39618)

Question 972087: What is the sum of (2/3) + (2/3)^2 + (2/3)^3 + (2/3)^4 +....+ (2/3)^100 ?
I think the answer is 2-2(2/3)^100

Click here to see answer by farohw(175)

Question 972233: Write a rule for the nth term:
5, 2, -1, -4...
Click here to see answer by josgarithmetic(39618)

Question 972238: Write a rule for the nth term, then find a(sub 8).
3, 15, 75, 375,...
Click here to see answer by josgarithmetic(39618)

Question 972271: The number of the sequence is 17, if the second one is 3, what
is the first number?

Click here to see answer by rothauserc(4718)

Question 972278: i need the next number in this:
571, 612, 530, 653, 489
Click here to see answer by Boreal(15235)

Question 972260: if 17 is the first number and 3 is the second number then what is the third number???
Click here to see answer by Fombitz(32388)

Question 972260: if 17 is the first number and 3 is the second number then what is the third number???
Click here to see answer by Alan3354(69443)

Question 972286: if the squence number is 17 and the second number is 3 then what is the first number???
Click here to see answer by Alan3354(69443)

Question 972066: find the missing number in the following series: 3, 14, 27, ?, 63, 86, 115
Click here to see answer by Edwin McCravy(20056)

Question 972386: how many multiples of 4 are there between 17 and 95?
Click here to see answer by Boreal(15235)

Question 972395: Find S sub 10 for the following sequence: 1/2, 2, 7/2, 5, 13/2,...
Click here to see answer by amarjeeth123(569)

Question 972482: find the indicated sum for each arithmetic series
S15 for 5 + 9 + 13 + 17
Click here to see answer by josgarithmetic(39618)

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