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 968413: find the sum of the 1st 13 terms of the series 7+21+63+189
Click here to see answer by Edwin McCravy(20056)

Question 968421: the,sequence of,the number,is,17 if the second number is 3 ,what is the first
Click here to see answer by Fombitz(32388)

Question 968167: How many different 10 letters words can be formed from the letters in the word "IMMUNOLOGY"?
Click here to see answer by Edwin McCravy(20056)

Question 968156: Find the indicated sum:
6 + 12 + 18 + ... + 300
Click here to see answer by Edwin McCravy(20056)

Question 967986: In how many ways can 4 people be lined up?

Click here to see answer by Edwin McCravy(20056)

Question 968723: I need to create a totally different sequence that starts at 10, 2 .... For my sequence I need to write four more terms and the equation. I can't use four terms that can be found from arithmetic or geometric.
Click here to see answer by josgarithmetic(39617)

Question 968749: There are 3 numbers in the sequence. If the second number is 3, what is the first number?
Click here to see answer by Alan3354(69443)

Question 969019: The sum of tue 2nd and 3rd terme of a gp is12. The sum of the 3rd and 4th term is
-36. Find the 1st term of the common ratio

the geometric sequence of the sum of the 4th and 5th terms is 108 and the sum of the 5th and 6th is 324. Cal.THE common ratio and the value og the 1st term

Click here to see answer by Theo(13342)

Question 969018: the number of sequence is 17.if the second number is 3,what is the first number?
Click here to see answer by Theo(13342)

Question 969145: How many five-card hands consisting of three cards of one face value and two cards of another face value can be dealt from a deck of 48 playing cards?
Click here to see answer by stanbon(75887)

Question 969177: Given the sequence in the table below, determine the sigma notation of the sum for term 4 through term 15.
n an
1 4
2 −12
3 36
Click here to see answer by Edwin McCravy(20056)

Question 969149: How many 5 card hands consisting of 3 cards of 1 face value and 2 cards of another face value can be dealt from a 48 card deck?
Click here to see answer by Edwin McCravy(20056)

Question 969206: Suppose you work for a company that ays $0.01 the first day, $0.02 the second day, $0.04 the third day, and so on. If the daily wage keeps doubling, what would your total income be for working 30 days?
Click here to see answer by solver91311(24713)

Question 969223: Using number 1 3 5 7 9 11 13 15 in 3 steps sum should be 30 we can repeat numner
Click here to see answer by solver91311(24713)

Question 969203: Find the sum of the infinite geometric series 36+12+4...
Click here to see answer by amarjeeth123(569)

Question 969238: _,3,17 what's the first number of the sequence?
Click here to see answer by Fombitz(32388)

Question 969083: 124 is the ____ term of the arithmetic sequence -2, 5, 12,...

Click here to see answer by Fombitz(32388)

Question 969239: the sequence of the number x is 17, if the number of the second sequence is 3, what is the number of the first sequence.
.
.
.
X is the 17th number of the sequence.
3 is the 3rd number of the sequence.
Find .

Click here to see answer by Fombitz(32388)

Question 969279: ()+()+()=30? (by using only 1,3,5,7,9,11,13,15 only)
Click here to see answer by Fombitz(32388)

Question 968993: X+y+z=30 X y z can be any of these 1,3,5,7,9,11,13,15 and even you can use repeated or do anything with numbers but x+y+z=30 only in three steps answer

Click here to see answer by Fombitz(32388)

Question 968597: How do I solve 3B+A+C=99 finding what b, A, and C's sum is to equal 99

Click here to see answer by Fombitz(32388)

Question 969325: How many 8-symbol codes can be formed using 4 different symbols? Repeat symbols are allowed.
How do I solve this? Thank you!
Click here to see answer by solver91311(24713)

Question 969329: A theater has 38 rows with 23 seats in the first row,26 in the second row,29 in the third row and so on. How many seats are in the theater?
Click here to see answer by josmiceli(19441)

Question 969406: the number of sequence is 17,if the second number is 3,then what bis the first number?
Click here to see answer by stanbon(75887)

Question 969587: Find the first 40 terms of the sequence defined by A(n+1) = {(1/2)An if An is an odd number and 3An + 1 if An is an even number} and A1 = 67, A2= 134.
Click here to see answer by Edwin McCravy(20056)

Question 969681: Find the 5th term of 5,0, -5
Click here to see answer by Fombitz(32388)

Question 6532: Please help me answer the following question: If y varies inversely as x and y=8 when x=4, find y when x=16
Click here to see answer by Alan3354(69443)

Question 969940: Find the 43rd term of -124, -122, -120...
Click here to see answer by amarjeeth123(569)

Question 969971: Please help me solve this problem
the sequence is as follows
----- , 3 , 17
What is the first term?
Click here to see answer by josgarithmetic(39617)

Question 969971: Please help me solve this problem
the sequence is as follows
----- , 3 , 17
What is the first term?
Click here to see answer by KMST(5328)

Question 969975: if the first number is 17,3..... whats next number in sequence
Click here to see answer by josgarithmetic(39617)

Question 969778: Find the 1st term of this geometric sequence - 3 , 17
Click here to see answer by KMST(5328)

Question 969779: Find the 1st term of this arithmetic sequence, - 3 , 17
Click here to see answer by KMST(5328)

Question 969944: Find the 31st term in the sequence whose general term is
A sub n=-3+4(n-1).
Can you please respond with how you completed this equation

Click here to see answer by Fombitz(32388)

Question 970124: If in a geometric progression,the second term exceeds the first term by 20 and the fourth term exceeds the second term by 15,find the possible values of the first term.
Click here to see answer by reviewermath(1029)

Question 970169: What are the next two numbers in this series 1,8,27,58

Click here to see answer by MathLover1(20850)

Question 970200: if the sequences is 17 and the 3 rd number in the sequence is 3, what is the second number in the sequence ?
Click here to see answer by josgarithmetic(39617)

Question 969332: 1.) Find the indicated term using the given information: a20=45, a10=25, a1=?
2.) Find the sum of the infinite geometric series: -10,-5,-5/2?
Click here to see answer by Fombitz(32388)

Question 970409: How to write the repeating decimal .9999..... as a fraction?
Click here to see answer by Fombitz(32388)

Question 970578: write the series in summation notation:
1+4+9+16
Click here to see answer by amarjeeth123(569)

Question 970593: If the number of the sequence is 17 and the second number is 3. What is the third n
Click here to see answer by josgarithmetic(39617)

Question 970637: The function f(x)=7/x-5 is one to one.
a.) Find the inverse of f.
b.) Graph f, f^-1 and y=x on the same set of axes.
Click here to see answer by Boreal(15235)

Question 970640: Solve the following exponential equation.
8^x=3
Click here to see answer by Alan3354(69443)

Question 970641: Solve the following exponential equation.
2.7^x=(0.6)^-x
Click here to see answer by Alan3354(69443)

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