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

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 Algebra: Sequences of numbers, series and how to sum them Solvers Lessons Answers archive Quiz In Depth

 Question 607239: Hi Tutors, Help me please, if you may? I'm not sure what to do. Give an example of an arithmetic sequence that is found in the real world. Find the common difference and write a recursive and iterative rule for the sequence. Use one of the rules to find another term of the sequence. Then give an example of a geometric sequence that is found in the real world. Find the common ratio and write a recursive and iterative rule for the sequence. Use a rule to find any term. Then clearly explain why each example is either an arithmetic or geometric sequence. Click here to see answer by stanbon(57203)

 Question 607328: Weights of the Pacific yellowfin tuna follow a normal distribution with mean 68 pounds and standard deviation 12 pounds. For randomly caught Pacific yellowfin tuna, what is the probability that the weight is less than 50 lbs? Click here to see answer by ewatrrr(10682)

 Question 607408: Where do i start to set this up? Suppose that 79,000 is invested at 5 and 1/2% interest, compounded quarterly . (a) find the function for the amount to which the investment grows after t years. (b) find the amount of money in the account at t=0,3,7,10 years. (c)when will the amount of money reach \$300,000? Click here to see answer by stanbon(57203)

 Question 607406: 75+15+3+... Find the sum, if it exists. Help? how to solve? Click here to see answer by Edwin McCravy(8879)

 Question 607821: Please help me with problem, thanks: 7+(-21)+63+(-189)+... a) n=18 b) S_n=3829 Click here to see answer by ewatrrr(10682)

 Question 608061: Write a recursive rule for 2,4,16,256,65536 You would square the number, I need help of what to do next, please Click here to see answer by jim_thompson5910(28476)

 Question 608090: Simplify: (n+2) ! / n! I thought it may be (n+1) x (n+2) Click here to see answer by jim_thompson5910(28476)

 Question 608109: Find a27 for the following sequence: 12,9,6,3 Click here to see answer by jim_thompson5910(28476)

 Question 608185: The given series has 6 terms. What is the sum of the terms of the series? 17+25+33+...+57 Click here to see answer by jim_thompson5910(28476)
 Question 608185: The given series has 6 terms. What is the sum of the terms of the series? 17+25+33+...+57 Click here to see answer by solver91311(16868)

 Question 608335: Hi my question is: How are the angles 38 and 52 geometrically related? Click here to see answer by solver91311(16868)

 Question 608591: I have a problem that I simply cannot solve. I have to put this series into summation notation, but I can't find the explicit formula! The series is 1 + 1/4 + 1/9 + 1/16 + 1/25 How do I even find the common difference in a series like that? Click here to see answer by ewatrrr(10682)
 Question 608591: I have a problem that I simply cannot solve. I have to put this series into summation notation, but I can't find the explicit formula! The series is 1 + 1/4 + 1/9 + 1/16 + 1/25 How do I even find the common difference in a series like that? Click here to see answer by Edwin McCravy(8879)

 Question 609035: The first term of a geometric sequence is 1 and the common Ratio is 5, determmine the largest 3-digit number that represents a term of this geometric sequence. Click here to see answer by flame8855(424)

 Question 609283: a building 82 ft high cast a 205-ft shadow. The triangle formed by the building and its shadow is similar to the triangle formed by Sarah and her shadow. how tall is she? Click here to see answer by Alan3354(30924)

 Question 608763: There are 52 white keys on apiano. The frenquency produced when a key is struck is the number of vibrations per second the key's string makes. Is this relation a function? Click here to see answer by richard1234(5390)

 Question 609314: the scale on a map is 1 cm : 7 km. if two cities are 14 cm apart on the map, what is the distance between the cities? Click here to see answer by stanbon(57203)

 Question 609342: Find the nth term of a sequence whose first several terms are given. 9/10, 10/11, 11/12, 12/13... an=? Click here to see answer by flame8855(424)

 Question 609435: How do I find the first term of the arithmetic sequence if a^4=16 and a^10=46? Click here to see answer by scott8148(6628)

 Question 610090: 87. Find the next number in the series: 1, 7, 21, 46, 85, 141,? A. 207 B. 217 C. 227 D. 237 Click here to see answer by flame8855(424)

 Question 609287: Alright so I have to do quadratic FUNCTIONS, not quadratic equations. Apparently there is a difference so I have to solve all these other little problems to get the ax^2+bx+c. For example, (not word to word but you'll get the point): Find c(x)=? it takes \$103 to make 3 cameras, \$163 to make 7 cameras and \$328 to make 12 cameras. ok, i know how to but them into the three equations: 103=6a+3b+c, 163=49a+7b+c, and 328=144a+7b+c. but after that i'm totally lost. Click here to see answer by SwiftAlbatross(13)

 Question 610408: common difference = 5, first term = -2 ... The nth term of the series is 183. Fin the value of n. Can't get further than -2 + 5(n-1) = 183 .. how do i get to the answer? Click here to see answer by ewatrrr(10682)

 Question 610505: Find three geometric means between 64 and 4 I got an answer of 8, 16, 32 Is that correct? Click here to see answer by jim_thompson5910(28476)

 Question 610742: Identify wheter the pattern is arithmetic, geometric, or neither. 1,1/2,1/4,1/8,1/6...... Click here to see answer by jim_thompson5910(28476)

 Question 610800: what is the next numbers in a series of 3,9,21,46,91,163, 269 Click here to see answer by richwmiller(9132)
 Question 610800: what is the next numbers in a series of 3,9,21,46,91,163, 269 Click here to see answer by fcabanski(872)

 Question 610868: Find the sum of the series 5 + 0 + (-5) + ...+(-130) I think the answer is -1750. Is that correct? Click here to see answer by jim_thompson5910(28476)

 Question 610892: FInd the standard deviation for the given data: 4, 8, 9, 14, 10 I got 3.22 is that correct? Click here to see answer by jim_thompson5910(28476)
 Question 610892: FInd the standard deviation for the given data: 4, 8, 9, 14, 10 I got 3.22 is that correct? Click here to see answer by ewatrrr(10682)

 Question 610928: Find the sixth term of the geometric sequence 1/2, 1/3, 2/9 Is 32/729 correct? Click here to see answer by jim_thompson5910(28476)

 Question 610978: A um contain 30 colored balls. Eight of the balls are purple. 10 of the balls are orange. The remaining balls are all brown. Three of the balls are randomly selected from the Urn. What is the probability that all three balls are brown. a. 11/203 b. 8/125 c. 5/92 d. 3/61 I think the correct answer is D. Is that correct? Click here to see answer by ewatrrr(10682)

 Question 611105: Which of the following is the next number in the series 3,6,4,9,5,12,6...? A)7 B)9 C)12 D)15 E)24 Click here to see answer by lynnlo(4155)

 Question 611113: What is the next term in the series 1,1,2,3,5,8,13...? A)18 B)21 C)13 D)9 E)20 Click here to see answer by vleith(2825)

 Question 611319: What is the standard deviation of 26, 33, 34, 40, 27? I think the correct answer is 32. Is that correct? Click here to see answer by ewatrrr(10682)

 Question 611317: Brand A car batteries have a warranty of 60 months. The warranty given by the company depends upon the average life of batteries. The life of the batteries is normally distributed with a mean of 62 months and a standard deviation of 2 months. What percent of the batteries will be working after 64 months. I got 25% is that correct. Click here to see answer by scott8148(6628)

 Question 611372: Shari has twelve cards, numbered from one to twelve. She randomly draws three cards with replacement. What is the probability that Shari draws an even card and then two odds. a. 3/8 b. 1/16 c. 1/4 d. 1/8 I think the answer is 3/8. Is that correct? d Click here to see answer by solver91311(16868)
 Question 611372: Shari has twelve cards, numbered from one to twelve. She randomly draws three cards with replacement. What is the probability that Shari draws an even card and then two odds. a. 3/8 b. 1/16 c. 1/4 d. 1/8 I think the answer is 3/8. Is that correct? d Click here to see answer by stanbon(57203)

 Question 611373: Two representatives are chosen from random from a group of 80 students that has 40 boys and 40 girls. What is the probability that both representatives are girls. a. 20/79 b. 1/4 c. 39/158 d. 39/160 I think the answer is b is that correct? Click here to see answer by solver91311(16868)

 Question 611554: 87 cents/ 30 in = ?/ ft Click here to see answer by nerdybill(6948)

 Question 611740: What is S6 for the arithmetic series 4+4.2+4.4+4.6+4.8+...? Click here to see answer by rfer(12644)

 Question 612087: write the rule for thr nth term of the arithmetic sequence. 1) 5,,14,23,32,41 2)d=-3;a6=30 3)-1,-4,-7,-10,-13... 4) d=5;a5=40 Click here to see answer by Edwin McCravy(8879)

 Question 612226: Find the indicated term of each geometric sequence. a8 for -1/250,-1/50,-1/10 Click here to see answer by stanbon(57203)

 Question 612396: find the formula for the partial sum of the first n termsof the following sequence -2+0+2+4+...+(2n-4) Click here to see answer by ewatrrr(10682)

 Question 612395: It says to write the following arithmetic series in sigma notation...2 problems 5+1+(-3)+(-7)+(-11).... -3,0,3,6,9,... Click here to see answer by ewatrrr(10682)

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