Tutor:

New! Get regular updates about newly solved problems via algebra.com's RSS system.

---

Recent problems solved by 'rfer'

rfer answered: 12658 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

Expressions-with-variables/352307: 1. 3w-13=1/4(52-12w) 2. 4x-28 ----- =2x 3 Thanks a lot! If you could put identity or no solution and explain a little that would be great too! 1 solutions Answer 251801 by rfer(12662)   on 2010-10-05 18:23:52 (Show Source): You can put this solution on YOUR website! 3w-13=13-3w 6w=26 w=4 1/3

test/351974: 2y=-48+6y 1 solutions Answer 251464 by rfer(12662)   on 2010-10-04 21:51:56 (Show Source): You can put this solution on YOUR website! 4y=48 y=12

Proportions/351990: Im not sure how to do proportions but if you can show me some work or somethin that will make me understand i will appreciate it this is one of the questions....3 over z= 1 over 8 1 solutions Answer 251463 by rfer(12662)   on 2010-10-04 21:50:07 (Show Source): You can put this solution on YOUR website! 3/z=1/8 multiply the extremes and the means 3*8=1*z z=24

Expressions-with-variables/351993: 7 more than x. 1 solutions Answer 251462 by rfer(12662)   on 2010-10-04 21:48:14 (Show Source): You can put this solution on YOUR website! x+7

Numbers_Word_Problems/351997: my tens and units digits are consecutive even integers with a product of 48 1 solutions Answer 251461 by rfer(12662)   on 2010-10-04 21:47:46 (Show Source): You can put this solution on YOUR website! 68

Expressions-with-variables/351897: 3x-5+3(x+3)=10 1 solutions Answer 251460 by rfer(12662)   on 2010-10-04 21:01:32 (Show Source): You can put this solution on YOUR website! 3x-5+3x+9=10 6x=6 x=1

Miscellaneous_Word_Problems/351933: Two angels are supplementary. If the mesures of the larger angle is 10.8degree more thatn twice the smaller, find the measurement of each angle. 1 solutions Answer 251459 by rfer(12662)   on 2010-10-04 20:56:27 (Show Source): You can put this solution on YOUR website! x+2x+10.8=180 3x=169.2 x=56.4 degrees 2x+10.8=123.6 degrees

decimal-numbers/351958: order the numbers from least to greatest these are the numbers 23.6 -45.2 50 -0.5 0.3 3/5 -4/5 now, I believe that 3/5 is .60 as a decimal and -4/5 is -.80 as a decimal this is the order I got below: i got this from gleast to greatest -0.5 -45.2 0.3 .60 .-80 23.6 50 1 solutions Answer 251458 by rfer(12662)   on 2010-10-04 20:52:16 (Show Source): You can put this solution on YOUR website! -45.2, -0.80, -0.5, 0.3, 0.60, 23.6, 50 -45.2, -4/5, -0.5, 0.3, 3/5, 23.6, 50 take a look at a number line for the order.

Rectangles/351922: in an isosceles triangle, one angle is 12 degrees more than twice the measure of one of the equal angles. Find the measure of each angle. 1 solutions Answer 251454 by rfer(12662)   on 2010-10-04 20:46:02 (Show Source): You can put this solution on YOUR website! 2x+2x+12=180 4x=168 x=42 degrees 2x+12=96 degrees

Inverses/351930: what is -87 / (-3/5) = 1 solutions Answer 251452 by rfer(12662)   on 2010-10-04 20:43:17 (Show Source): You can put this solution on YOUR website! -87*-5/3=435/3=145

Rectangles/351953: how would you find the length of one side of a rectangle if the length is 16 and the width is 4? 1 solutions Answer 251450 by rfer(12662)   on 2010-10-04 20:40:47 (Show Source): You can put this solution on YOUR website! Is your question correct?

Inequalities/351908: 5b-1>-11 1 solutions Answer 251449 by rfer(12662)   on 2010-10-04 20:39:37 (Show Source): You can put this solution on YOUR website! 5b>-10 b>-2

Rectangles/351935: in a certain right triangle, the measure of one angle is twice the measure of the smallest angle. Find the measure of the smallest angle. 1 solutions Answer 251445 by rfer(12662)   on 2010-10-04 20:36:21 (Show Source): You can put this solution on YOUR website! 30 degrees 60 degrees x+2x=90 3x=90 x=30

Equations/351694: -C=5 1 solutions Answer 251298 by rfer(12662)   on 2010-10-04 14:00:47 (Show Source): You can put this solution on YOUR website! c=-5

Linear-equations/351697: how do you find the slope of 2x-6y=negative12 and graph it? 1 solutions Answer 251297 by rfer(12662)   on 2010-10-04 14:00:00 (Show Source): You can put this solution on YOUR website! put the equation in slope intercept form 2x-6y=-12 -6y=-2x-12 y=1/3x+2 slope = 1/3 y int =2 (0,2) start from here then go one up, three right for next point which would be (3,3)

Expressions-with-variables/351594: A soft-drink manufacturer produces 15,600 cans of his product each hour. Cans are packed 24 to a case. How many cases could be filled with the cans produced in 4 hr? 1 solutions Answer 251268 by rfer(12662)   on 2010-10-04 12:23:41 (Show Source): You can put this solution on YOUR website! 15600/24=650 cases per hr 650*4=2600 cases

Equations/351623: How do I solve an equation with multiple variables on each side? Specific problem is: -20+2k=k-4k. Thanks 1 solutions Answer 251265 by rfer(12662)   on 2010-10-04 12:21:42 (Show Source): You can put this solution on YOUR website! combine like terms watching the signs very closely -20+2k=-3k 5k=20 k=4

Linear_Algebra/351627: what is the slope of y=-3x. and how do you graph it? 1 solutions Answer 251262 by rfer(12662)   on 2010-10-04 12:18:48 (Show Source): You can put this solution on YOUR website! undefined vertical line

percentage/351643: You now need to secure a mortgage. Assume there are no closing costs or fees and you are taking out a conventional mortgage loan. The amount you owe is $135,000. You have two loans to choose from: Loan A is a 30-year fixed loan at 7.5% Loan B is a 15-year fixed loan at 6.5% Assume you have exactly $1150 a month to spend on the mortgage, which loan would you choose? Explain your reasoning. 1 solutions Answer 251260 by rfer(12662)   on 2010-10-04 12:14:19 (Show Source): You can put this solution on YOUR website! R=(P(r/12))/(1-(1+r/12)^12t) R=payment

Linear-equations/351430: what is the slope of this line? x+3y=6 1 solutions Answer 251105 by rfer(12662)   on 2010-10-03 20:37:38 (Show Source): You can put this solution on YOUR website! slope m=-1/3

Functions/351411: When working with functions, you may think of f(x) as equal to y? 1 solutions Answer 251104 by rfer(12662)   on 2010-10-03 20:36:40 (Show Source): You can put this solution on YOUR website! x=domain y=range so y is dependent on x therfore y is a funtion of x, f(x)

Linear-equations/351363: Y=2x+1. Show how to solve for x and for y. Also how to find x and y intercepts with domains of 0,1,2,3. 1 solutions Answer 251103 by rfer(12662)   on 2010-10-03 20:31:31 (Show Source): You can put this solution on YOUR website! domain=x range=y y=2(0)+1 y=1 (0,1)y int is when x=0 ----------- y=2*1+1 y=3 (1,3) ------------- y=2*2+1 y=5 (2,5) ----------------- y=2x+1 0=2x+1 2x=-1 x=-1/2 (-1/2,0) x int is when y = 0

test/351420: Al has twice as much money as vic. vic has $5 less than connie. together they have $125. how much does each have? 1 solutions Answer 251102 by rfer(12662)   on 2010-10-03 20:23:17 (Show Source): You can put this solution on YOUR website! al=2x=60 vic=x=30 connie=x+5=35 2x+x+x+5=125 4x=120 x=30

Linear_Equations_And_Systems_Word_Problems/351421: Murray and Max must paint the fence around their home. The fence is 810 feet long (they have a nice piece of property). Murray agrees to paint 25% more of the fence than Max (He bet on the Knicks). How many feet of fence must each paint? 1 solutions Answer 251101 by rfer(12662)   on 2010-10-03 20:20:05 (Show Source): You can put this solution on YOUR website! x+1.25x=810 2.25x=810 x=360 1.25x=450

Linear_Equations_And_Systems_Word_Problems/351396: 1/3(9x-3y)-(4x-1)+4y 1 solutions Answer 251100 by rfer(12662)   on 2010-10-03 20:17:19 (Show Source): You can put this solution on YOUR website! 3x-y-4x+1+4y -x+3y+1

Percentage-and-ratio-word-problems/351389: joe works at mcdonalds each month he earns 800 plus 7 percent of 9200 how much does he make 1 solutions Answer 251099 by rfer(12662)   on 2010-10-03 20:15:26 (Show Source): You can put this solution on YOUR website! 800+(9200*0.07)=1444

Linear_Algebra/351418: what is the slope and y-intercept of the given line 5y-2x+8=0 1 solutions Answer 251098 by rfer(12662)   on 2010-10-03 20:13:07 (Show Source): You can put this solution on YOUR website! 5y=2x-8 y=2/5x-8/5 y=2/5x-1 3/5 slope m=2/5 y int B=-1 3/5

Linear-equations/351400: Find the equation in standard form of the line with a slope of 5/4 that goes through the point (-2,3).? 1 solutions Answer 251097 by rfer(12662)   on 2010-10-03 20:11:00 (Show Source): You can put this solution on YOUR website! y=5/4x+5.5 5/4x-y=-5.5

real-numbers/351416: 5 - (b - 7) 1 solutions Answer 251096 by rfer(12662)   on 2010-10-03 20:06:17 (Show Source): You can put this solution on YOUR website! 5-b+7=12-b

Inequalities/351350: A compact car can be rented from firm A for $160 per week with no charge for mileage or from firm B for $100 per week plus 20 cents for each mile driven. If the car is driven m miles, for what values of m does it cost less to rent from firm A? 1 solutions Answer 251067 by rfer(12662)   on 2010-10-03 18:27:44 (Show Source): You can put this solution on YOUR website! 160=100+.2m 60=.2m m=300 miles is equal m > 300

Systems-of-equations/351299: The down payment for the lot you buy is $20,000. If you have only $7300, what percent of the down payment do you still need? 1 solutions Answer 251064 by rfer(12662)   on 2010-10-03 18:24:29 (Show Source): You can put this solution on YOUR website! 7300/20000=0.365 you have 100-36.5=63.5% needed