8th grade math questions?
94153
That's a tough 8th grade question; I've seen similar ones in algebra 2.  You have to figure the amount of the job that gets done in one hour. If x is the total time for the faster machine, 2x is the total time for the slower machine.  Together it takes 3 hours, so together they can do 1/3 of the job in one hour.  The slow machine can do 1/x of the job in an hour; the faster, 1/(2x).  This gives the equation:\n\n1/x + 1/(2x) = 1/3\n\nmultiply both sides of this equation by the LCD (6x) as if it were a giant distributive property example and get:\n\n6 + 3 = 2x       (the denominators all cancel out)\n\nso 9 = 2x (the slower machine takes 9 hrs)\n4.5 = x (the faster one takes 4 1/2 hours)
1076304
(1) 1.3\n(4) 4\n(5) Right\n(6) 0\n(7) 0\n(8)0\n(9)12
58231
http://www.studentquestions.com/homework_ans/4244.html
1111502
okay here is what I think....still a little unclear\nx=9th grade\nx+8=8th grade\n3/4(x+8)=11th grade\n\nso...\nx+ x+8+ 3/4(x+8)=96\n\nx+x+8+3/4x+6=96\ncombine terms\n2 3/4x + 14=96\nsubtract 14 from both sides\n2 3/4x=82\ndivide each side by 2 3/4\nx=29 9/11\nthen round up\n9th grade =30\n8th grade =38\n11th grade=28 (actually it is28 1/2 but bc you can't have 1/2 of a person it is 28)
191747
I have eight answers\n\n888 + 88 + 8 + 8 + 8 = 1000\n\n(8888 - 888) / 8 = 1000\n\n(8888 - 88) / 8.8 = 1000\n\n(8888 - 8) / 8.88 = 1000\n\n8 x [(8x8) + (8x8)] - (8+8+8) = 1000\n\n8 x [(8+8)x8 - (8+8+8)/8] = 1000\n\n[(88-8)/8] ^ [(8+8+8)/8] = 1000\n\n[8 + (8+8)/8] ^ [(8+8+8)/8] = 1000\n\nThose were 8 answers but if it not enough i can give you the 9th which is very silly\n\n[8/8] [8-8] [8-8] [8-8] = [1] [0] [0] [0] = 1000
806420
Go to their website and you might be able to get the answers. Or if you have the book, they have all of the odd answers in the back of the book.  (Or if you have an older sibling who's really good at math, they can help a lot!)
442931
1. 17\nfirst you add 8 to both sides & u'll get 2x=34. Then you divide both sides by 2 & u'll get x=34/2 which is x=17.\n2. 5\nsubtract 5 from both sides (the bars enclosing 20 are the absolute vale bars which means that 20 "loses" the negative sign). u'll get 3x=15. then divide both sides by 3. so, x=15/3 which is 5.\n3. 5\nsubtract 12 from both sides. u'll get 4x=20. then divide both sides by 4. so x=20/4 which is x=5.\n4. -6\nsubtract 16 from both sides. u'll get 8x=-48. then divide both sides by 8 & u'll get x=-48/8 which is -6.\n\nhope this helps (& good luck)
859324
1) 8 - 3 4/5 = 5 - 4/5 = 4 + 1 - 4/5 = 3 1/5\n2) 2 1/6 - 1 2/3 = 1 + 1/6 - 2/3 = 1 1/6 - 4/6 = = 1 - 3/6 = 1 - 1/2 = 1/2\n3) 6 1/10 - 4 3/10 = 2 + 1/10 - 3/10 = 2 - 2/10 = 1 + 1 - 1/5 = 1 4/5\n4) 3 1/8 - 2 1/4 = 1 + 1/8 - 1/4 = 1 + 1/8 - 2/8 = 1 - 1/8 = 7/8\n5) 4/4 - 4 7/8= 1 - 4 7/8 = -3 - 7/8 = -3 7/8
1102373
i wont answer.... log onto www.mathguru.com and discover solutions with explanations.
856067
1)1,8,27,64,125\n  x^3 = 1^3, 2^3, 3^3, 4^3, 5^3\n\n2)9, 13, 15, 19, 21, 25\n a(n)+ n-2 = {a(n-1) +a(n+1)}/2\n\n3)00001, 00011, 00101, 00111, 01001\n  1,3,5,7,9 in binary\n\n4)17,23,5,18,20,25,21,9,15,16\nok, your teacher is an ass for this one..  heres the breakdown\nq is the 17th letter, w is the 23 letter, e, r, t, y, u, i, o, p\nthe top row of a standard U.S. keyboard. i think i earned 10 points for that one alone\n\n\n5)\nFOUR\nF I V E\nN I N E\n\nR=0\nF=2\nI=3\nN=5\nE=6\nU=7\nV=8\nO=9\n\n2970 + 2386 = 5356\nDONE.  Hope this works for you
984884
Adding and subtracting:  You use the sign from the largest number.\n\nIn your example: 8x +6x + 2 + 10\nAll are positive.  You have 14x + 12\n\nLet's say you  have 8x - 6x.  the 8 is bigger and is positive so your answer is positive.  It's 2x.\n\nNow try 6x - 8x.  The 8x is negative and is the larger number.  So it is going to be negative.  The answer is - 2x.  \n\nIf multiplaying or dividing:\n\n+ and + is +\n+ and  - is -\n-  and -  is + \n\nYou must have to memorize those.  Remember, it's always positive unless one sign is positive and one negative.  Then it is negative.\n\nBest Wishes,\nSue
752959
Problem 1: Find an exponential function of the form f(x)=ba^x+c with y-intercept 2, horizontal asymptote y=-2, that passes through the point P(1,4). \n\nYou find the y-intercept by replacing x with zero, which gives f(x) [which is y on the graph] = 2, so b + c = 2 (since a^0 = 1)\n\nThe horizontal asymptote is y = c, so c = -2.  That means b must be [you figure it out]\nNow it is y = 4a^x - 2.  This must be true when x=1 and y=4.\nSo 4 = [you figure it out; answer deleted due to complaint from below]\n\n\nProb. 3.  What is the amount in the account if $500 is invested for 10 years at the annual rate of 5% compounded continuously? \n  Just plug in the values.\nA = 500 e^(.05 x 10)\n\n[answer deleted]
954369
Dun teach an eight grade the wrong thing! U can't jus flip 2 fractions like tis?\n\nLol i tink i had nothing better to do.\nBut i tink this is ur homework so i'll give u hints instead.\n\nto solve tis , u're supposed to put them in a common denominator form.\n\nfor the part ,      x^2 -1   =  x^2 - 1^2  =   (x-1)(x+1)    \n\nnow jus put tis in and ta-da u can find ur common denominator.\nGG Solve it !!
775488
Ok, Victoria, if you're going to ask for help you have to write the questions correctly.  Problem 1 cannot be solved using algebra the way you wrote it, I doubt you can use complex integration or any other advanced tool to solve that one.  Unfortunately, I just spent the last half hour manipulating it before I remembered that little fact.\n\nPut parentheses in.  Had you put the parentheses in the problem would have been trivial.  Kudos to the helpers who were smarter than I in figuring out the constants were in the exponent.  It's not that hard Victoria, especially when you're asking for help.\n\nWrite the question correctly.\n\n\nPS. Irma, you forgot to multiply the 2 from 4=2^2 through the whole parenthetical statement.  The answer is x=4.\n.
1079568
Find the least common multiple for 4 and 8.  It is 8.\nMultiply everything by 8\n8(10x) - 8(1/4) = 8(9x) + 8(3/8)\n80x - 2 = 72x + 3\nSubtract 72 x from each side\n8x - 2 = 3\nAdd 2 to each side\n8x = 5\nDivide each side by 8\nx = 5/8
298555
If it's math you can get some pretty good help at math.com. going to google for extra practice in pretty much anything. edhelper has worksheets you can print.
967876
1) 2a^3 - 13a^2b + 11ab^2 + 14b^3\n\n2) (2a-4b) (4a^2+8ab+16b^2)\n\n3)  (b-8)(b-1)=0\n      b=8   or    b=1\n\n4) 4m^3 - 26m^2 - 14m=0\n2m(2m^2 - 13m - 7)=0\n2m=0  or  2m^2 - 13m -7=0\nm=0  or    (2m+1)(m-7)=0\n                  m=-0.5   or  m=7\n\n so the final answer is m=0 and m=-0.5 and m=7