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 776684: Please explain how 3+4[8(5*5-20)-41] equals -1
Click here to see answer by KMST(5328)

Question 776686: 30,31,34,39,46???
I don't get it what is the sequence?? Please help
Click here to see answer by AnlytcPhil(1806)

Question 776837: THE FIFTH TERM OF AN ARITHEMETIC SEQUENCE IS 10 & THE SUM OF THE THE FIRST 10 TERMS IS 115. FIND IT'S FIRST TERM AND IT'S COMMON DIFFERENCE.
Click here to see answer by pakhi(24)

Question 776841: c+11 over 21 equals 4 over 7
Click here to see answer by tommyt3rd(5050)

Question 776864: sigma 5 (3) (1/2)
k=1
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Question 776882: What's the answer to 21 11/15 divided by 8 5/9?.
Click here to see answer by stanbon(75887)

Question 776947: What are the next two numbers after these numbers? 1,1,2,6,24,_,_
Click here to see answer by FrankM(1040)

Question 777051: The first four numbers of a sequence are 28, 20, 12, and 4. Which term of the sequence is - 36?
How can I solve this? Please have step-by-step instructions. Thanks a lot!
Click here to see answer by 1998Baby(63)

Question 777062: The sequence is 281, 270,259, 248...
I have to write a function. How do I write a function with this? Sorry, but I can't seem to figure it out! Please write step-by-step how you solved this. Thanks!
Click here to see answer by 1998Baby(63)

Question 777096: Any number in the series 1 3 7 15 31 63 can be expressed in terms of the number proceeding it. If x is a number in the series, what must the number be?
A. 2x +
1
B. 3(x-1) + 1
C. 3x-2
D. 4x-5
Click here to see answer by KMST(5328)

Question 777353: on a recent trip, asha drove 230 miles on 14 1/4 gallons of gasoline. how many miles per gallon did she average
Click here to see answer by wilft1(217)

Question 777471: What is 3 times longer than 1 and 5/8
Click here to see answer by jim_thompson5910(35256)

Question 777593: How do you get the number 240 using PEMDAS Using the numbers 1,1,5 you can only use each number on ce and it need to ba as close to 289 as possible

Click here to see answer by solver91311(24713)

Question 777615: Solve for C
[C-(160*4)-(256*9)]/4
Click here to see answer by solver91311(24713)

Question 777757: what if the sum of the first 75 numbers starting with 2? please help me!
Click here to see answer by mananth(16946)

Question 777710: How do you write the equation .....the sum of 3, h, and 51?
Click here to see answer by jim_thompson5910(35256)

Question 777900: two angles measure [30-a] and [125+2a].if each one is the supplement of the other ,then find the value of a

Click here to see answer by solver91311(24713)

Question 778125: Find all sets of 3 consecutive integers whose sum is between 95 and 115.
Click here to see answer by MathLover1(20850)

Question 778478: Write a recursive formula for the sequence and find the next three terms in the sequence.
Sequence: 2, 11, 38, 119, . . .
Click here to see answer by stanbon(75887)

Question 778583: In an arithmetic sequence, a(sub10) + a(sub28) = 90. The 19th term must be...
Click here to see answer by Edwin McCravy(20056)

Question 778639: Given the arithmetic progression -1/6,1/12,1/3...find the 10th term and the sum of the 12 terms

Click here to see answer by psbhowmick(878)

Question 777823: What comes next in the series 19, 4, 21, 2, 25... and why?
Click here to see answer by Edwin McCravy(20056)

Question 779206: Using the data set below, please calculate the:
2
88
6
4
9
5
8
- Mean
- Median
- Mode

Which is more effected by the large value of 88 in the data, the mean or median?
Click here to see answer by psbhowmick(878)

Question 779587: Please could you help and explain to me how to work out two middle numbers and a fifth number given the first and the fourth number e.g 3 --- --- 11 --- in a sequence of numbers.
Thanks.
Click here to see answer by fcabanski(1391)

Question 779653: a^(1/x)=b^(1/y)=c^(1/z) if a,b,c are in GP. Prove x,y,z are in AP
Click here to see answer by jsmallt9(3758)

Question 779683: Suppose you buy a new car for $18,000. At the end of n years, the value of your car is given by the sequence vn = 18000(3/4)^n, n = 1, 2, 3, �.. Find the fifth term and explain what this value represents. Describe the nth term of the sequence in terms of the value of your car at the end of each year.
Click here to see answer by oscargut(2103)

Question 779764: what is the next number in the sequence and how?
4, 8, 28, ??
Click here to see answer by Edwin McCravy(20056)

Question 779843: The next two numbers to this sequence 2,3,10,26,72,196,?,?.
Click here to see answer by oscargut(2103)

Question 780302: How do you find the 100th and nth term of a sequence?
Click here to see answer by stanbon(75887)

Question 780302: How do you find the 100th and nth term of a sequence?
Click here to see answer by solver91311(24713)

Question 780354: find the sum or difference of 1/6 and 11/15
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Question 780385: The mean of five numbers is 9. If one of the five numbers is removed, the mean becomes 10. What is the value of the number that was removed?
Click here to see answer by psbhowmick(878)

Question 780889: Find the sum of the infinite series
1/(1 � 3 � 5)+1/(3 � 5 � 7)+1/(5 � 7 � 9)+1/(7 � 9 � 11)+ .......
Click here to see answer by psbhowmick(878)

Question 780977: What is the next number in the sequence 25/12 , 3, 47/12 ?
Click here to see answer by solver91311(24713)

Question 781387: What is the range of the following data set?
Stem - Leaves
0 -
1 - 0 8
2 - 1 4 6 6
3 - 4 7

Click here to see answer by stanbon(75887)

Question 781383: What is the median of the following group of numbers: 111, 110, 120, 118, 115, 113?
Click here to see answer by dedecandy(4)

Question 781383: What is the median of the following group of numbers: 111, 110, 120, 118, 115, 113?
Click here to see answer by edjones(8007)

Question 781516: use digits and a decimal point to write one hundred sixty millionths
Click here to see answer by rfer(16322)

Question 781739: 1,3,5,7,9 need the next three terms and explanations of patterns
Click here to see answer by fcabanski(1391)

Question 781719: What are the next to terms in this sequence?
5,10,20,40...
Click here to see answer by fcabanski(1391)

Question 782030: My question was about arithmetic series. Sn = -126, t1= -1, and tn = -20
How do I determine n?

Click here to see answer by stanbon(75887)

Question 782030: My question was about arithmetic series. Sn = -126, t1= -1, and tn = -20
How do I determine n?

Click here to see answer by mananth(16946)

Question 782126: fill in the next numbers in the following sequence and explain how you worked it 1,1,1,3,5,9,17 ,_,_,_

Click here to see answer by oscargut(2103)

Question 782195: Complete sequence 6:5::8:?
Click here to see answer by oscargut(2103)

Question 782554: the sequence 6, 24, 54, 96,... comes from the surface area of cubes.
they want me to find the next number in the sequence but I don't know how.
I do know the formula for the surface area of a cube but I don't know what to plug in to get those numbers.
Click here to see answer by mananth(16946)

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