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 882741: Using numbers 1 3 5 7 9 11 13 17 19 in 5 steps sum should be 30.We can repeat numbers.
Click here to see answer by Edwin McCravy(20056)

Question 882717: Dear Sir/Madam;
A pleasant day! please help me with this sequence problem. Consider the sequence x+3, x+7, 4x-2...
a) if the sequence is arithmetic, find x and then determine the first 4 terms
b) if the sequence is geometric, find x and then determine the first 4 terms.
Thank you very much!
Click here to see answer by Edwin McCravy(20056)

Question 810815: find the next term of series
1,3,5,9,17,33
Click here to see answer by richwmiller(17219)

Question 882639: which term of the g.p 1/2,3/4,9/8,... is 3^9/2^10
Click here to see answer by richwmiller(17219)

Question 883026: Abdul made $306 for 18 hours of work.
At the same rate, how much would he make for 13 hours of work?
Click here to see answer by JulietG(1812)

Question 883026: Abdul made $306 for 18 hours of work.
At the same rate, how much would he make for 13 hours of work?
Click here to see answer by stanbon(75887)

Question 883029: The sum of series (-5)+(-7)+(-9)...(-19)is
Click here to see answer by jim_thompson5910(35256)

Question 882937: Dear Sir/ Ma'am;
Good day! Can you please help me with this infinite geometric series question:

If S is equals to (1/10)+ (2/10)^2 + (3/10)^3 + (4/10)^4+... Find S
Thank you very much!
Click here to see answer by richwmiller(17219)

Question 883084: in the following porportion what does y equal
y 39
- = -
4 30
Click here to see answer by jim_thompson5910(35256)

Question 883151: consider the sequence 1/2; 4; 1/4; 7; 1/8; 10 to find the next two terms
Click here to see answer by richwmiller(17219)

Question 883453: The current in an electrical conductor varies inversely as the resistance of the conductor. If the current is 44 ampere when the resistance is 880 ohms, what is the current when the resistance is 400 ohms?
Click here to see answer by stanbon(75887)

Question 883457: The number of aluminum cans used each year varies directly as the number of people using the cans. If 250 people use 60000 cans in one year, how many cans are used each year in a city which has a population of 120000?
Click here to see answer by josmiceli(19441)

Question 883506: Using numbers 1 3 5 7 9 11 13 17 19 in 5 steps sum should be 30.We can repeat numbers
Click here to see answer by Alan3354(69443)

Question 883624: 1,1.5,3,7.5,21,x,
x=?

Click here to see answer by richwmiller(17219)

Question 883657: find 4 nos in gp whose sum is 85 & product is 4096
Click here to see answer by richwmiller(17219)

Question 883657: find 4 nos in gp whose sum is 85 & product is 4096
Click here to see answer by MathTherapy(10552)

Question 883766: The population of a local species of dragonfly can be found using an infinite geometric series where a1 = 30 and the common ratio is two fifths. Write the sum in sigma notation and calculate the sum that will be the upper limit of this population.
a)the summation of 30 times two fifths to the i minus 1 power, from i equals 1 to infinity.; the sum is 50.
b)the summation of 30 times two fifths to the i minus 1 power, from i equals 1 to infinity.; the sum is divergent.
c)the summation of two fifths times 30 to the i minus 1 power, from i equals 1 to infinity.; the sum is 50.
d)the summation of two fifths times 30 to the i minus 1 power, from i equals 1 to infinity.; the sum is divergent.

Click here to see answer by jim_thompson5910(35256)

Question 883645: what is the number of terms that are identical in the series 3,7,11,15�� and 2,5,8...� to 100 terms continued?
Click here to see answer by richwmiller(17219)

Question 884067: write an equation for the nth term of the arithmetic sequence 4 1 -2 -5
Click here to see answer by Fombitz(32388)

Question 884072: find the 3 arithmetic means between -4 and 16.
Click here to see answer by richwmiller(17219)

Question 883984: 1,6,6,2,9,0,3,1,_ find sequence
Click here to see answer by richwmiller(17219)

Question 884187: Prove there is no largest real number in ~R where ~R is the complement of R the real number set.

Click here to see answer by fcabanski(1391)

Question 884206: What is the supplement of the sequence of the following nrs. 20.02 18.04 16.06
Click here to see answer by Fombitz(32388)

Question 884389: Write the formula of the following sequence:
0, 2, 0, 2, 0, 2,.....
Click here to see answer by Fombitz(32388)

Question 884465: What will be the next number of the following series: 1,1,2,4,6,18,21,?
Click here to see answer by richwmiller(17219)

Question 883512: solve (1-1/3) (1-1/4) (1-1/5)........(1-1/n) ?

Click here to see answer by richwmiller(17219)

Question 884472: What will be the next number of the following series: 1,1,2,4,6,18,21,?
a)84 b)63 c)78 d)28
Click here to see answer by richwmiller(17219)

Question 884554: how many terms of the A.P. 1,4,7,10,.... are needed to get the sum 715 ?
Click here to see answer by skartikey(21)

Question 884583: Hi, i've question about sequence. 7999, 68, 28, 20 , x ?
What should be instead of x ?
Regards,
G
Click here to see answer by richwmiller(17219)

Question 884546: Find the next 2 elements of the series
2, 7, 40, 85, 341, __, __ ?

Click here to see answer by richwmiller(17219)

Question 883982: Daniel wants to save at least 20 dollars by putting pennies in a jar each day. On the first day he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he puts n pennies into the same jar. Which day is the first day on which he has at least 20 dollars in the jar? (1 dollar=100 pennies)
Click here to see answer by richwmiller(17219)

Question 884716: 1, 6,36, 240, 1960, ?
Click here to see answer by richwmiller(17219)

Question 884740: find the sum of first 29 multiple with 25?
Click here to see answer by richwmiller(17219)

Question 884779: If x is the sum of the integers from 1 to 79, inclusive, and y is the sum of the integers from 80 to 150, inclusive, what is the average (arithmetic mean) of x and y?
Click here to see answer by josgarithmetic(39617)

Question 884814: Find the sum of the terms of the following arithmetic progressions.
6,0,-6,-12... To 100terms
Click here to see answer by JulietG(1812)

Question 884814: Find the sum of the terms of the following arithmetic progressions.
6,0,-6,-12... To 100terms
Click here to see answer by richwmiller(17219)

Question 884848: What is the general term of 4,10,18,28,40?

Click here to see answer by rothauserc(4718)

Question 884848: What is the general term of 4,10,18,28,40?

Click here to see answer by richwmiller(17219)

Question 884858: A square has a side of 6.25 feet. What is the area in square feet? Round to the correct significant digits
Click here to see answer by JulietG(1812)

Question 884718: Find the length of the diagonal AC of the square ABCD if each side of the square is 4cm.
Click here to see answer by KMST(5328)

Question 884719: 1-8,4-58,9-346,16-7469,25-?
Click here to see answer by richwmiller(17219)

Question 883152: consider the sequence 1/2; 4; 1/4; 7; 1/8; 10 to find the next two terms and calculate the sum of the first 50 terms of the sequence
Click here to see answer by richwmiller(17219)

Question 882108: Find a formula for Sn the sum of the first n terms of the sequence 25,-5,5......
Click here to see answer by richwmiller(17219)

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