please help me, 30% of my final is on this and i have no idea how to do it
130686
Well. Do you know how to work rational expressions in general? The first link below is a useful general resource and has a section on rational expressions and polynomial long division; the second is specifically on rational expressions at college intro-level.\n\nI used to tutor math and I found that most people's difficulty with word problems was not the actual math, it was extracting the appropriate equations from the words. Once they had the equations, they could solve them (assuming they'd learned the basics). \n\nI'd find it pretty difficult to give you general guidelines on "how to solve word problems with rational expressions" but the main trick with word problems is to figure out a) what variables are involved, and assign each of them a letter (e.g., speed of first train is x, time it has been travelling is y, speed of second train is z...), b) sort out the relationship between them (e.g. x = 2z/5), and c) make sure you know what *exactly* is being asked. It is not at all uncommon for word problems to include extraneous information (colour of train, age of driver) to muddle the issue.\n\nYour best bet is almost certainly to go ask your teacher, professor, TA, tutor, study group, or classmate-who-understands-it for help. They will be better able to figure out where your problem is if they can watch you work through an actual example.
614798
I've got a big exam tomorrow too, infact 4! I haven't revised for my maths or one of my physics but I revised loadsa past papers in the past month for my other physics. I went over them today to see which questions i couldn't do and tried to do them, or look at the definitions I need to know. I think if you just skim the stuff you need to define then you can work the rest out.
383471
format it!!! if u dont know how, u can look through my previous questions, where i got an answer that is good 4 everything!!!
101283
Hello,\nI am only in 10th grade. I never heard about nominals or ordinals... percentage is simple, Suppose u want to find the profit%, it will be (profit/Cost price)*100.. Read some lower class maths books. They will help u get ur basics right.\nCumulative frequency can be of two types, less than C.F and Greater than C.F..... Lets use the following data table...\n\n class ....... frequency ....... C.F. (less than)\n 0-10  ........... 3 ............. 3\n 10-20 ........... 5 ............. 5 + 3 = 8\n 20-30 ........... 3 ............. 8 + 3 = 11\n 30-40 ........... 8 ............. 11 + 8 = 19\n\nSo u see, u just have to add the frequencies in less-than C.F... in greater than C.F... U have to add all the frequencies and then subtract the individual frequencies from it...\n Total sum of frequency = 3 + 5 + 3 + 8 = 19\n class ......... frequency ......... C.F.(Greater than)\n 0-10  ............ 3 ............... 19 - 3 = 16\n 10-20 ............ 5 ............... 19 - (5+3) = 11\n 20-30 ............ 3 ............... 19 - (8+3) = 8\n 30-40 ............ 8 ............... 19 - (11+8)= 0...
455079
First change the percent to a decimal. To do this, change the % sign to a decimal point and the move the decimal point two places to the left. Thus 12% =.12\n\nNow multipl this decimal by $250\n.12* $250 = $30
115449
15: First you cut the triangle in half so the hypotenuse is 17 and the bottom leg is 8 (half of 16=8) and then use Pythagorean theorem so it would be 17^2 - 8^2 (=225) and take the square root of that (=15).\nGood luck on your midterm!
539366
Here's how to think about it.  In the end you will be mixing so many liters of 30% mixture and so many liters of 100% mixture.\n\nLet a be the amount of 30% mixture.\nLet b be the amount of 100% mixture.\n\nAdded together these must equal 16 liters:\na + b = 16\n\nAlso, you want the mixture to equal 50%.\n30% x a + 100% x b = 50% x 16\n\nYou have two equations and two unknowns, so this should be solvable.\n\nLet's solve for a:\na = 16 - b\n\nSubstitute this into the second equation:\n30% x (16 - b) + 100% x b = 50% x 16\n\nYou could do this all with decimal amounts (30% = 0.30, 50% = 0.50) etc.  But it is easier to just do them as whole amounts (30, 100, 50).  The answer will work out either way.\n\nDistribute through:\n30 x 16 - 30b + 100b = 50 x 16\n\nSimplify:\n480 - 30b + 100b = 800\n\nCombine like terms:\n480 + 70b = 800\n\nSubtract 480 from both sides:\n70b = 800 - 480\n70b = 320\n\nDivide both sides by 70:\nb = 320 / 70\nb = 32 / 7\nb = 4 4/7 liters\n\nSo you will need to drain 4 4/7 liters of the 30% mixture, then add 4 4/7 liters of the 100% mixture.\n\nAs a double check:\na = 11 3/7\nb = 4 4/7\n\n30% x 11 3/7 + 100% x 4 4/7 =? 50% x 16\n30% x 80/7 + 32/7 =? 8\n24/7 + 32/7 =? 8\n56/7 = 8 <-- check\n\nSo the correct answer is you must drain 32/7 liters, or 4 4/7 liters (as a mixed fraction).\n\nAs a decimal, the answer is approximately 4.571 liters.
494332
here's a link, page down and see if you can follow the steps. :\ngood luck.\n\nhttp://cstl.syr.edu/fipse/Algebra/Unit2/expo.htm
52788
hmmm...i'm in bio now, and that was in one of our past chapters...dont have my notes with me, but I remember it being a low #, so I'd say the first option A...hold on though, I'm going to try to look it up in my book now...\nk, back- yep! its exactly 3-5%. hope that helped!
646802
IDK, but u need to get some tutoring instead of asking all your questions on the internet.
473416
bring it to ur teacher, and hopefully if they cant fix it theyll give u another that u can use during the exam
668072
i think you need to give more informations but if you re talking about equation it is not so informal than you think\nyou just have to concentrate and try to figure the way you re supposed to resolve it
129633
Don't bother posting all your homework questions like this and the others you've posted here. No one is going to do your work for you. If you asked a single question, maybe someone would be willing to steer you in the right direction, but you're asking too much of anyone. And no one wants to help you cheat yourself out of an education.
489133
take 35-3, which is 32.  then divide 32 by 35.  you'll get a decimal answer,  move the decimal to the right 2 spaces and that's your percent
47675
A couple hours of revision on them a night should do it.  Doing that will help make it so you don't have to do alot of last minute cramming and stressing out over it.
164357
Try this:\n\n778+785+158+162=1883\n\n(778/1883)*100=41.317% or 41.32% or 41%\n(785/1883)*100=41.688% or 41.69% or 42%\n(158/1883)*100=8.390% or 8.39% or 8%\n(162/1883)*100=8.603% or 8.60% or 9%\n\n41%+42%+8%+9%=100% to confirm totals
45225
If you missed 26, you got 89 correct.  So you do:\n\n89 divided by 115, which is 77%.\n\nSo you got about 88 out of 115.