# 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 142142: Find the sum of the first nine terms of the arithmetic series. 2 - 5 - 12 - 19 - ... Click here to see answer by nabla(475)

 Question 142080: Please help with this problem. A first year Calculus class test gave the following information: Mean of 63 and a Standard Deviation of 12. Answer the questions: A. If 800 took the test how many passes with a 51% or higher? b. What is the standard score of 39%? C. If a student got and 82%, what is the standard score? Click here to see answer by nabla(475)

 Question 142221: find the explicit formula a7=-10 and a13=-48 Click here to see answer by Edwin McCravy(8908)

 Question 142327: The average of x,y, andz is 80. If two of the numbers are 74 and 78, then what is the other number. Mrs Jones is installing wall to wall carpet in a room that measures 12 1/2ft by 9 2/3 ft. how much will it cost if the carpet is \$26.00 per square yard? Thank you Click here to see answer by stanbon(57337)

 Question 142422: I am unsure how to translate this question into an equation. I can figure out the likely answr but I need to show my work. Can you help me? Use inductive reasoning to determine the next three numbers in the pattern: 2x Thx Karen Click here to see answer by checkley77(12569)

 Question 142424: Please help me to solve this showing y work. I have a hard time translating into an equation Make a conjecture about the relationship between the original number and the final number in the following process. Pick a number Multiply the number by 12 Add 12 to the product Divide the sum by 4 Subtract 3 from the quotient Click here to see answer by checkley77(12569)

 Question 142441: Mike invested \$6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned \$624 in interest. How much did he invest at each rate? Click here to see answer by checkley77(12569)

 Question 142439: I need to translate this into an equation and solve it showing all of my work and I do not know how Car rental agency A will rent a compact car for \$35 per day and an additional charge of \$0.24 per mile. Car rental agency B will charge only \$0.16 per mile but charges \$41 per day. If Adam wanted to rent a car for three days, how many miles would Adam have to drive to make car rental agency B a better bargain? Thank you so much Click here to see answer by checkley77(12569)

 Question 142676: The question is asking for the rule for the nth term for this sequence: (-5, 10, -15, 20, ...) I can't figure out how to get alternating postive and negative numbers. -25: an = -5n^(???) is among the many ideas I have tried. (an means "a sub n") Click here to see answer by scott8148(6628)

 Question 143147: FInd the sum: (-2) + 2 + 6 + ... + 150 A) 2925 B) 2886 C) 5772 D) 592 Click here to see answer by oscargut(891)

 Question 143430: Infinite geometric series. The question asks me to write the repeating decimal .999... as a fraction. I think it is 9/9.00 infinetly and then a 1 but I have no idea how yo write that. Thanks for the help Click here to see answer by stanbon(57337)

 Question 143748: the pairs of numbers below follow the same pattern. What is the pattern? 28 and 16 34 and 19 30 and 17 24 and ? Click here to see answer by vleith(2825)

 Question 144040: I have the sequence 2,5,9,14,20,27,35,44... How can I find an explicit formula to find the nth term? How can I find the nth term if An = 324? Click here to see answer by stanbon(57337)

 Question 144227: select the next number in the series: 298 209 129 58 -4 choices are -13, -93, -66, -57 Click here to see answer by stanbon(57337)
 Question 144227: select the next number in the series: 298 209 129 58 -4 choices are -13, -93, -66, -57 Click here to see answer by MathLover1(6628)

 Question 144249: Can some please help me? The half life of Thorium-232 is 14 billion years. Make a table showing the half-life decay of a sample of Thorium-232 from 16 grams to 1 gram, with the time in years in the first column and the mass in grams in the second column. The sequence representing the mass of Thorium-232 is an example of the arithmetic series. Is this true or false THANK YOU !!! Click here to see answer by scott8148(6628)

 Question 144841: The sum of the first 6 multiples of 8 , starting with 8 ,is Click here to see answer by jim_thompson5910(28593)
 Question 144841: The sum of the first 6 multiples of 8 , starting with 8 ,is Click here to see answer by vleith(2825)

 Question 144990: I dont know how to write a recursive rule for the sequence. Click here to see answer by solver91311(16877)

 Question 145718: a worker is hired for 20 days. on the first day he makes 1 cent on the 2nd day he makes 2 cents and the pay doubles each day. What is the total pay? Click here to see answer by Earlsdon(6287)

 Question 146054: what is the geometric series -...+ in summation notation? Click here to see answer by Edwin McCravy(8908)

 Question 146451: Write the linear function for which f (0) = -4 and f (2) = 8. Thank you Click here to see answer by 24HoursTutor.com(40)
 Question 146451: Write the linear function for which f (0) = -4 and f (2) = 8. Thank you Click here to see answer by jim_thompson5910(28593)

 Question 146668: Determine whether g(x)= 2x 3squar - 3x is even, odd, or neither Thanks Click here to see answer by jim_thompson5910(28593)

 Question 146996: Does anyone know how to Find the inverse of f(x)=x^5 ? Thanks Click here to see answer by Fombitz(13828)

 Question 146994: Does anyone know how to Find the inverse of f (x)=∛(x-1) (cube root of x-1) ? Thanks Click here to see answer by Fombitz(13828)

 Question 147150: A small area in front of a building is triangular in shape. The perimeter of the triangle is 37 meters. The second side is one-half of the first side in length. The third side is 3 meters less than the first side. Find the length in meters of each side of the triangular region. Click here to see answer by nerdybill(6958)

 Question 147003: Can someone help me with this, not sure how to go about this... Using the formula, n^2=(k(k+1)(2k+1))/6 compute the value of where m=0 and 5 Click here to see answer by Nate(3500)

 Question 149335: I need help. Could you please teach me how to get the next three terms of this series? 1 4 9 61 59 94 _ _ _ Thank you very much. I'm sorry to tell you that this question came from the math teacher that's why I can't furnish the book source. Click here to see answer by 8336625(3)