New!
Get regular updates about newly solved problems
via algebra.com's RSS system.
Recent problems solved by 'rfer'
rfer answered: 12643 problems
Jump to solutions: 0..29 , 30..59 , 60..89 , 90..119 , 120..149 , 150..179 , 180..209 , 210..239 , 240..269 , 270..299 , 300..329 , 330..359 , 360..389 , 390..419 , 420..449 , 450..479 , 480..509 , 510..539 , 540..569 , 570..599 , 600..629 , 630..659 , 660..689 , 690..719 , 720..749 , 750..779 , 780..809 , 810..839 , 840..869 , 870..899 , 900..929 , 930..959 , 960..989 , 990..1019 , 1020..1049 , 1050..1079 , 1080..1109 , 1110..1139 , 1140..1169 , 1170..1199 , 1200..1229 , 1230..1259 , 1260..1289 , 1290..1319 , 1320..1349 , 1350..1379 , 1380..1409 , 1410..1439 , 1440..1469 , 1470..1499 , 1500..1529 , 1530..1559 , 1560..1589 , 1590..1619 , 1620..1649 , 1650..1679 , 1680..1709 , 1710..1739 , 1740..1769 , 1770..1799 , 1800..1829 , 1830..1859 , 1860..1889 , 1890..1919 , 1920..1949 , 1950..1979 , 1980..2009 , 2010..2039 , 2040..2069 , 2070..2099 , 2100..2129 , 2130..2159 , 2160..2189 , 2190..2219 , 2220..2249 , 2250..2279 , 2280..2309 , 2310..2339 , 2340..2369 , 2370..2399 , 2400..2429 , 2430..2459 , 2460..2489 , 2490..2519 , 2520..2549 , 2550..2579 , 2580..2609 , 2610..2639 , 2640..2669 , 2670..2699 , 2700..2729 , 2730..2759 , 2760..2789 , 2790..2819 , 2820..2849 , 2850..2879 , 2880..2909 , 2910..2939 , 2940..2969 , 2970..2999 , 3000..3029 , 3030..3059 , 3060..3089 , 3090..3119 , 3120..3149 , 3150..3179 , 3180..3209 , 3210..3239 , 3240..3269 , 3270..3299 , 3300..3329 , 3330..3359 , 3360..3389 , 3390..3419 , 3420..3449 , 3450..3479 , 3480..3509 , 3510..3539 , 3540..3569 , 3570..3599 , 3600..3629 , 3630..3659 , 3660..3689 , 3690..3719 , 3720..3749 , 3750..3779 , 3780..3809 , 3810..3839 , 3840..3869 , 3870..3899 , 3900..3929 , 3930..3959 , 3960..3989 , 3990..4019 , 4020..4049 , 4050..4079 , 4080..4109 , 4110..4139 , 4140..4169 , 4170..4199 , 4200..4229 , 4230..4259 , 4260..4289 , 4290..4319 , 4320..4349 , 4350..4379 , 4380..4409 , 4410..4439 , 4440..4469 , 4470..4499 , 4500..4529 , 4530..4559 , 4560..4589 , 4590..4619 , 4620..4649 , 4650..4679 , 4680..4709 , 4710..4739 , 4740..4769 , 4770..4799 , 4800..4829 , 4830..4859 , 4860..4889 , 4890..4919 , 4920..4949 , 4950..4979 , 4980..5009 , 5010..5039 , 5040..5069 , 5070..5099 , 5100..5129 , 5130..5159 , 5160..5189 , 5190..5219 , 5220..5249 , 5250..5279 , 5280..5309 , 5310..5339 , 5340..5369 , 5370..5399 , 5400..5429 , 5430..5459 , 5460..5489 , 5490..5519 , 5520..5549 , 5550..5579 , 5580..5609 , 5610..5639 , 5640..5669 , 5670..5699 , 5700..5729 , 5730..5759 , 5760..5789 , 5790..5819 , 5820..5849 , 5850..5879 , 5880..5909 , 5910..5939 , 5940..5969 , 5970..5999 , 6000..6029 , 6030..6059 , 6060..6089 , 6090..6119 , 6120..6149 , 6150..6179 , 6180..6209 , 6210..6239 , 6240..6269 , 6270..6299 , 6300..6329 , 6330..6359 , 6360..6389 , 6390..6419 , 6420..6449 , 6450..6479 , 6480..6509 , 6510..6539 , 6540..6569 , 6570..6599 , 6600..6629 , 6630..6659 , 6660..6689 , 6690..6719 , 6720..6749 , 6750..6779 , 6780..6809 , 6810..6839 , 6840..6869 , 6870..6899 , 6900..6929 , 6930..6959 , 6960..6989 , 6990..7019 , 7020..7049 , 7050..7079 , 7080..7109 , 7110..7139 , 7140..7169 , 7170..7199 , 7200..7229 , 7230..7259 , 7260..7289 , 7290..7319 , 7320..7349 , 7350..7379 , 7380..7409 , 7410..7439 , 7440..7469 , 7470..7499 , 7500..7529 , 7530..7559 , 7560..7589 , 7590..7619 , 7620..7649 , 7650..7679 , 7680..7709 , 7710..7739 , 7740..7769 , 7770..7799 , 7800..7829 , 7830..7859 , 7860..7889 , 7890..7919 , 7920..7949 , 7950..7979 , 7980..8009 , 8010..8039 , 8040..8069 , 8070..8099 , 8100..8129 , 8130..8159 , 8160..8189 , 8190..8219 , 8220..8249 , 8250..8279 , 8280..8309 , 8310..8339 , 8340..8369 , 8370..8399 , 8400..8429 , 8430..8459 , 8460..8489 , 8490..8519 , 8520..8549 , 8550..8579 , 8580..8609 , 8610..8639 , 8640..8669 , 8670..8699 , 8700..8729 , 8730..8759 , 8760..8789 , 8790..8819 , 8820..8849 , 8850..8879 , 8880..8909 , 8910..8939 , 8940..8969 , 8970..8999 , 9000..9029 , 9030..9059 , 9060..9089 , 9090..9119 , 9120..9149 , 9150..9179 , 9180..9209 , 9210..9239 , 9240..9269 , 9270..9299 , 9300..9329 , 9330..9359 , 9360..9389 , 9390..9419 , 9420..9449 , 9450..9479 , 9480..9509 , 9510..9539 , 9540..9569 , 9570..9599 , 9600..9629 , 9630..9659 , 9660..9689 , 9690..9719 , 9720..9749 , 9750..9779 , 9780..9809 , 9810..9839 , 9840..9869 , 9870..9899 , 9900..9929 , 9930..9959 , 9960..9989 , 9990..10019 , 10020..10049 , 10050..10079 , 10080..10109 , 10110..10139 , 10140..10169 , 10170..10199 , 10200..10229 , 10230..10259 , 10260..10289 , 10290..10319 , 10320..10349 , 10350..10379 , 10380..10409 , 10410..10439 , 10440..10469 , 10470..10499 , 10500..10529 , 10530..10559 , 10560..10589 , 10590..10619 , 10620..10649 , 10650..10679 , 10680..10709 , 10710..10739 , 10740..10769 , 10770..10799 , 10800..10829 , 10830..10859 , 10860..10889 , 10890..10919 , 10920..10949 , 10950..10979 , 10980..11009 , 11010..11039 , 11040..11069 , 11070..11099 , 11100..11129 , 11130..11159 , 11160..11189 , 11190..11219 , 11220..11249 , 11250..11279 , 11280..11309 , 11310..11339 , 11340..11369 , 11370..11399 , 11400..11429 , 11430..11459 , 11460..11489 , 11490..11519 , 11520..11549 , 11550..11579 , 11580..11609 , 11610..11639 , 11640..11669 , 11670..11699 , 11700..11729 , 11730..11759 , 11760..11789 , 11790..11819 , 11820..11849 , 11850..11879 , 11880..11909 , 11910..11939 , 11940..11969 , 11970..11999 , 12000..12029 , 12030..12059 , 12060..12089 , 12090..12119 , 12120..12149 , 12150..12179 , 12180..12209 , 12210..12239 , 12240..12269 , 12270..12299 , 12300..12329 , 12330..12359 , 12360..12389 , 12390..12419 , 12420..12449 , 12450..12479 , 12480..12509 , 12510..12539 , 12540..12569 , 12570..12599 , 12600..12629 , 12630..12659, >>Next
Numbers_Word_Problems/236001: Sam Mathius invested part of his 10,000 bonus in a fund that paid an 11% Profit and invested the rest in stock that suffered a 4% loss. Findthe amount of each investment if his overall net profit was $650.
Please Help 1 solutions
Answer 173764 by rfer(12647) on 2009-11-06 18:36:47 (Show Source):
|
Geometry_Word_Problems/236005: A customer purchased a car and financed &16,000. The customer borrowed part of the money from a bank charging 10% annual interest and the rest from a credit union at 8% annual interest. If the total interest for the year was $1390, how much was borrowed from the bank and how much was borrowed from the credit union? 1 solutions
Answer 173763 by rfer(12647) on 2009-11-06 18:32:28 (Show Source):
|
Travel_Word_Problems/235947: the distance up a hill and down the other side is the same. A car averages 30 mph up the hill and 60 mph down the other side. What is the average speed of the car overall. 1 solutions
Answer 173750 by rfer(12647) on 2009-11-06 16:53:17 (Show Source):
|
Expressions-with-variables/235978: i am supposed to identify like terms but i don't understand it my problem is -17-17=6-x you can see that the problem doesn't have like terms. I asked my teacher but she said that i still had to solve it. she told me though in class that it can have 1 answer many answers or no answer please help. 1 solutions
Answer 173746 by rfer(12647) on 2009-11-06 16:49:28 (Show Source):
You can put this solution on YOUR website!-17-17=6-x
all of the whole numbers are like terms
if you had more than one x they would be like terms
combine -17 and -17=-34
-34=6-x
subtract 6 from both sides
-34-6=6-6-x
-40=-x
we can't have a -x as part of the answer so multiply through by -1
40=x
x=40
|
Angles/235979: The diffrence of the measurements of two supplementary angles is 50 degrees. what is the measurement of each angle. 1 solutions
Answer 173743 by rfer(12647) on 2009-11-06 16:39:21 (Show Source):
|
Equations/235916: hello my name is anthony and who ever reponds back to this it would be great cuz i am have trouble with algerbra equations with varibles on each sides and so i am new at this and so if you could tell me the steps and explain to me the best way you can that would be great
5x-3-=3x+7 1 solutions
Answer 173690 by rfer(12647) on 2009-11-06 12:04:52 (Show Source):
|
Rectangles/235919: the perimeter of the rectangle is 186 inches. the length exceeds with 43 inches, what is the length and width? 1 solutions
Answer 173689 by rfer(12647) on 2009-11-06 12:02:02 (Show Source):
|
Linear_Equations_And_Systems_Word_Problems/235909: Celsius to Fahrenheit. Water freezes at 0 degrees C or 32 degrees F and boils at 100 degrees C or 212 degrees F. There is a linear equation that expresses the number of degrees Fahrenheit (F) in terms of the number of degrees Celsius (C). Find the equation and find the Fahrenheit temperature when the Celsius temperature is 45 degrees. 1 solutions
Answer 173688 by rfer(12647) on 2009-11-06 11:59:09 (Show Source):
|
Quadratic_Equations/235834: I am having a tough time with these problems on this one I must use the discriminate to determine the number of solutions of the quadratic equation and whether the solutions are real or complex. It is not necessary to find the roots just determine the number of types of solutions.
4/3x^2 - 2x + 3/4 =0 1 solutions
Answer 173682 by rfer(12647) on 2009-11-06 11:28:33 (Show Source):
You can put this solution on YOUR website!the discriminant
b^2-4ac
------------------
4/3x^2-2x+3/4=0
a=4/3, b=-2, c=3/4
------------------
-2^2-4(4/3)(3/4)
----------------
Does that help?
Bob
|
logarithm/235819: a loan of $12,000 is made at 14%interest compounded annually,after t years the amount due,A is given by the function A(t)=12,000(1.14)^t
find the doubling time. 1 solutions
Answer 173679 by rfer(12647) on 2009-11-06 11:20:11 (Show Source):
|
Angles/235829: The measure of an angle is 8 less than three times the measure of the angles supplement. Find the measure of the angle. 1 solutions
Answer 173676 by rfer(12647) on 2009-11-06 11:11:22 (Show Source):
|
Linear-equations/235906: A rectangular shaped parking lot is to have a perimeter of 382 yards. If the width must be 84 yards, what will the length be? 1 solutions
Answer 173674 by rfer(12647) on 2009-11-06 11:03:22 (Show Source):
|
Graphs/235632: I'm being to decide whether the givin point lies on the graph of the line. The equation is this: 2y-4x=8,(-2, 8).
This is over some work that I missed in class and I am not understanding it. Could you please help? 1 solutions
Answer 173494 by rfer(12647) on 2009-11-05 17:49:18 (Show Source):
You can put this solution on YOUR website!Go ahead and solve the equation creating an input/output table, graph those points, draw a line the covers your points the see if this point falls on your line,
Give it a try.
Bob
|
expressions/235620: xy challenge - Rewrite the expression as a product.
4x + 7x
I do not understand what this means or how to rewrite it.
Thank you 1 solutions
Answer 173493 by rfer(12647) on 2009-11-05 17:46:14 (Show Source):
|
Proportions/235600: please help me solve this word problem:
Maria can write a paper an average of 4 pages during a 90 min. class period. At this rate,how many hours will it take her to write 16 pages?
create the proportion then solve.
This is what I did: 4/90=16/x, then i multiplied them and then i divided the number I got to 4. I got:x=360. But my teacher got x=6... Please tell me how she got that.
thank you 1 solutions
Answer 173487 by rfer(12647) on 2009-11-05 17:04:58 (Show Source):
|
|