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

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 Question 768612: How many terms of the A.P 26,21,16,11..........are needed to give the sum 11? Click here to see answer by MathLover1(7480)

 Question 768704: if you multiply a number n by 14 the product is 168 how do you work it out Click here to see answer by suruman(21)

 Question 769217: what is the 7th term of the geometric sequence 8,4,2,1,...,8/2n-1. A.16 B.1/4 C. 1/8 D. 1/16 E. 1/2 Click here to see answer by Jc0110(110)

 Question 769365: If the average of 8 numbers is 6.25, what is the sum of the numbers? Click here to see answer by Jc0110(110)

 Question 769673: which number comes next in the number pattern 15;25;40;60;...? Click here to see answer by knighty2002uk(39)

 Question 769769: How many different four-digit numbers can be formed using the digits 0 through 9 if no digit can appear twice in a number? Click here to see answer by oscargut(1838)

 Question 769801: If the difference between the 3rd and the 1st term of a G.P is 42, and the 4th term is greater than the 2nd term by 168, what is the (1) common ratio, (2) 1st term. (3) 4th term of the progression Click here to see answer by reviewermath(721)
 Question 769801: If the difference between the 3rd and the 1st term of a G.P is 42, and the 4th term is greater than the 2nd term by 168, what is the (1) common ratio, (2) 1st term. (3) 4th term of the progression Click here to see answer by oscargut(1838)

 Question 769723: What is the sum of 1*2 + 2*3 + ... + (n-1)n? Click here to see answer by Edwin McCravy(9716)

 Question 769841: how do you find the sum of all the odd integers between 38 and 78? Click here to see answer by josmiceli(10616)

 Question 769848: Find each sum in the same base as the given numerals. Question: 323four + 212four Question: 5374eight + 615eight Click here to see answer by tommyt3rd(3721)

 Question 769961: Find the value of x such that (9x+7) + (7x+1) + (3x+4) is an arithmetic series. Thank you! Click here to see answer by josgarithmetic(3308)

 Question 770259: the sum of the1 term and the 9term of an arithmetic progression is 24 what is the sum of all 9 terms? Click here to see answer by reviewermath(721)

 Question 770587: Question. What is the sequence of Less than 3, triangle 4, greater than 7, less than 6, triangle next to 8, greater than 14, less than 9, triangle sign 12? Click here to see answer by solver91311(18785)

 Question 770473: the smallest fraction which, when added to 2/5*15/21*7/10*3/8 given a whole number is: 36/37,37/40 how to solve it? Click here to see answer by Edwin McCravy(9716)

 Question 770677: hey need some help with this math question, um do you mind also putting out your workings and why you did that certain step. Thanks I struggle a bit so hopefully this will help. When I do this 2/3 it means a fraction. solve the x in these equations. multiply by the LCD to eliminate fractions. Vertify the solutions. x-5/2=7/2+1/2x Thanks, hope you can help Click here to see answer by Cromlix(2314)

 Question 770673: given that A,B,C and D are whole numbers such that A*B=8, B*C=28, C*D=63 and B*D=36, find the values of A,B,C and D. Click here to see answer by tommyt3rd(3721)

 Question 770689: given that A,B,C and D are whole numbers such that A+B=8, B+C=11,B+D=13 and C+D=14, find the values of A,B,C and D. Click here to see answer by Cromlix(2314)
 Question 770689: given that A,B,C and D are whole numbers such that A+B=8, B+C=11,B+D=13 and C+D=14, find the values of A,B,C and D. Click here to see answer by tommyt3rd(3721)

 Question 770694: aramugan has enough money to buy 24 apples, if the price of each apple is reduced by 5 cents, he will be able to buy an extra 6 apples with the same sum of money. find the original cost of each apple. Click here to see answer by Cromlix(2314)

 Question 770671: given that A,B,C and D are whole numbers such that A+B=8, B+C=11, B+D=13 and C+D=14, find the values of A,B,C and D Click here to see answer by tommyt3rd(3721)

 Question 770690: given that A,B,C and D are whole numbers such that A*B=8,B*C=28,C*D=63 and B*D=36, find the values of A,B,C and D. Click here to see answer by tommyt3rd(3721)

 Question 770706: what is the next term in the series: 2, 6, 9, 27, 30, __ Click here to see answer by oscargut(1838)

 Question 770720: A G.P. Is such that the third term is 9 times the first term, while the 2nd term is one-twenty fourth of the 5th term. Find its 4th term? Click here to see answer by stanbon(60771)

 Question 770794: Mean is 90, what is value of missing number 90, 85, x, 95, 90, 100, 90, 100 I know the answer is 70 is their an equation to solve. Click here to see answer by Jc0110(110)

 Question 770789: Ratio 5:3 boys 72 students total how many boys Click here to see answer by sheldonbbtrocks(94)

 Question 770821: 1. Product is -220. Sum is -12. What are the 2 numbers? 2. Product is 264. Sum is -34. What are the 2 numbers? 3. Product is -462. Sum is -1. What are the 2 numbers? Click here to see answer by oscargut(1838)
 Question 770821: 1. Product is -220. Sum is -12. What are the 2 numbers? 2. Product is 264. Sum is -34. What are the 2 numbers? 3. Product is -462. Sum is -1. What are the 2 numbers? Click here to see answer by Jc0110(110)

 Question 770864: missing nuber in the series - 9, ____, 6561, 43046721? Click here to see answer by solver91311(18785)

 Question 771040: In need of understanding the steps. For the pair of functions, f(x)=2x and g(x)= find the following A)fg(x) B)fg(4) C)gf(x) D)gf(4) (do not factor only simplify) Click here to see answer by Jc0110(110)

 Question 771025: Two numbers are in the ratio 7:2. The sum of the two numbers is 108. What is the smaller number? Click here to see answer by Jc0110(110)

 Question 771109: if the 12th partial sum is equal to 126 and the last term is 45. what is the first term of the sequence? Click here to see answer by Edwin McCravy(9716)

 Question 771283: which number comes next in this series 1/64,1/32,1/16,1/8,1/4,1/2 Click here to see answer by Jc0110(110)

 Question 771293: which number comes next in this series 18,81,27,72,36,63 Click here to see answer by oscargut(1838)

 Question 771284: which number comes next in this series 2,4,6,5,7,9,8, Click here to see answer by oscargut(1838)

 Question 771277: which number comes next in this series 18,81,27,72,36,63 Click here to see answer by oscargut(1838)

 Question 771335: How do I find the subsequent number in the example 1-2-8-48-384-?. Is there a pattern? Click here to see answer by jim_thompson5910(29613)

 Question 771402: The arithmetic of set of 50 numbers is 38. If two numbers 45 and 55 are discarded, the mean of the remaining set of numbers is_____. Click here to see answer by Edwin McCravy(9716)