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

decimal-numbers/692529: write in standard form 6.793*10 to the 6th power 1 solutions Answer 427044 by rfer(12662)   on 2012-12-10 18:56:07 (Show Source): You can put this solution on YOUR website! =6,793,000

expressions/692502: Factor: 2x^2-11x+15 1 solutions Answer 427023 by rfer(12662)   on 2012-12-10 17:27:58 (Show Source): You can put this solution on YOUR website! (-2x+5)(-x+3)

Linear-equations/692503: Write the equation of a line which passes through the y-axis at 7 and has a slope of 10 1 solutions Answer 427021 by rfer(12662)   on 2012-12-10 17:25:27 (Show Source): You can put this solution on YOUR website! y=10x+7

Rectangles/692448: The length and width of a rectangle are in the ratio of 5:3 The perimeter is 64 feet. Find the length and width of the rectangle 1 solutions Answer 427019 by rfer(12662)   on 2012-12-10 17:24:42 (Show Source): You can put this solution on YOUR website! 2(5x)+2(3x)=64 10x+6x=64 16x=84 x=64/16 x=4 5x=20ft lenght 3x=12 width

Percentage-and-ratio-word-problems/692452: anthony paid a 20% tip on a $15 bill. what ws the total amount anthony paid on the bill 1 solutions Answer 427017 by rfer(12662)   on 2012-12-10 17:21:54 (Show Source): You can put this solution on YOUR website! 15*1.15=$17.25

Equations/692466: What is a number such that eight less than twice the number is 32. 1 solutions Answer 427016 by rfer(12662)   on 2012-12-10 17:20:26 (Show Source): You can put this solution on YOUR website! 2x-8=32 2x=40 x=40/2 x=20

Inequalities/692489: -8 ≤ 8m + 28 My son says the answer should be a whole number. can not figure it out. 1 solutions Answer 427013 by rfer(12662)   on 2012-12-10 17:17:08 (Show Source): You can put this solution on YOUR website! -8 =< 8m+28 -8-28 =< 8m -36 => 8m -36/8 => m -4.5 => m I'm with you.

Average/692324: X-2/3=3/4 1 solutions Answer 426972 by rfer(12662)   on 2012-12-10 12:55:37 (Show Source): You can put this solution on YOUR website! x=3/4+2/3 x=9/12+8/12 x=17/12 x=1 5/12

Numeric_Fractions/692326: X/5=13 1 solutions Answer 426971 by rfer(12662)   on 2012-12-10 12:53:40 (Show Source): You can put this solution on YOUR website! x=13*5 x=65

Average/692327: You scored 85, 92, and 88 on three tests. You have one more test to take, can you get an A? Write an inequality and solve. An A is a 93 and above. 1 solutions Answer 426970 by rfer(12662)   on 2012-12-10 12:52:40 (Show Source): You can put this solution on YOUR website! (85+92+88+x)/4 => 93 265+x => 93*4 265+x => 372 x => 372-265 x => 107 I don't think they make it. 107% is hard to do.

Sequences-and-series/692218: WHAT WILL BE THE NUMBER IN PLACE OF (?). 2 16 112 672 3360 13440 (?). 1 solutions Answer 426948 by rfer(12662)   on 2012-12-10 09:32:14 (Show Source): You can put this solution on YOUR website! =40320

test/692258: Five decreased by eleven times a number greater than 71. evaluate this problem situation for values of the number. 1 solutions Answer 426946 by rfer(12662)   on 2012-12-10 09:26:02 (Show Source): You can put this solution on YOUR website! 7x-5 > 71 7x > 76 x > 76/7 x > 10

Money_Word_Problems/692055: a company borrows 91,000 for 6 years at a simple interest rate of 12.5% find the interest paid on the loan and the total amount paid 1 solutions Answer 426919 by rfer(12662)   on 2012-12-09 19:53:58 (Show Source): You can put this solution on YOUR website! i=Prt i=91000*0.125*6 i=$68250 Total 91000+68250=$159,250

Angles/692041: In a right triangle, one acute angle is 15 greater than two times the other acute angle. Find the difference between the angles. 1 solutions Answer 426918 by rfer(12662)   on 2012-12-09 19:48:23 (Show Source): You can put this solution on YOUR website! 2x+15+x=90 3x=90-15 x=75/3 x=25 2x+15=65 ------------- difference 65-25=40

Numbers_Word_Problems/692048: If 4 times a number is increased by 5 and the result is 25, what is the number? 1 solutions Answer 426917 by rfer(12662)   on 2012-12-09 19:44:50 (Show Source): You can put this solution on YOUR website! 4x+5=25 4x=25-5 x=20/4 x=5

Functions/691757: What is the slope-intercept form of the equation for the line with slope 1/4 and y-intercept at the region? 1 solutions Answer 426844 by rfer(12662)   on 2012-12-09 13:09:26 (Show Source): You can put this solution on YOUR website! y=1/4x

Linear-equations/691778: Write an equation of a line with the given slope m and y-intercept b m=-1, b=3 1 solutions Answer 426843 by rfer(12662)   on 2012-12-09 13:07:31 (Show Source): You can put this solution on YOUR website! y=-x+3

Miscellaneous_Word_Problems/691788: After a 10% weight loss, a person weighed 180 pounds. What was the weight before the loss? 1 solutions Answer 426842 by rfer(12662)   on 2012-12-09 13:06:44 (Show Source): You can put this solution on YOUR website! 180/0.90=200 lbs

Proportions/691779: hi there! really nedd your help with this question: what fraction of 144 is 84? please can i have an answer asap please! thanks a lot! 1 solutions Answer 426841 by rfer(12662)   on 2012-12-09 13:05:32 (Show Source): You can put this solution on YOUR website! 84/144=7/12

test/691492: there are 32 ounces in 1 quart. 128 ounces equals how many quarts? How many ounces are there in 7 quarts? 1 solutions Answer 426749 by rfer(12662)   on 2012-12-08 20:13:01 (Show Source): You can put this solution on YOUR website! 128/30=4.3 gts 32*7=224 oz

test/691518: -1/3 divide 2/5 = 25/9 divide x 1 solutions Answer 426748 by rfer(12662)   on 2012-12-08 20:10:45 (Show Source): You can put this solution on YOUR website! (-1/3)/(2/5)=(25/9)/(x) -1/3x=2/5*25/9 -1/3x=50/45 -1/3x=10/9 x=(10/9)/(-1/3) x=10/9*-3/1 x=-30/9 x=-10/3

test/691526: The ratio of roses to tulips was 5 1/2 to 7. If there were 168 tulips how many roses were there? 1 solutions Answer 426746 by rfer(12662)   on 2012-12-08 20:06:37 (Show Source): You can put this solution on YOUR website! 5.5/x=7/168 7x=924 x=924/7 x=132

Linear-equations/691537: What is y-4=-(x-1) in standard form? 1 solutions Answer 426745 by rfer(12662)   on 2012-12-08 20:04:13 (Show Source): You can put this solution on YOUR website! x+y=5

percentage/691541: After a 90% reduction, you purchase a new washing machine on sale for $76. What was the original price of the washing machine? 1 solutions Answer 426744 by rfer(12662)   on 2012-12-08 20:03:13 (Show Source): You can put this solution on YOUR website! 76/0.10=$760

Numeric_Fractions/691487: Please help me solve these equations: x-5 1/3=7 5/6 2 5/16=y+7 5/6 s+ 4 1/2 = 9 3/8 1 solutions Answer 426723 by rfer(12662)   on 2012-12-08 18:07:16 (Show Source): You can put this solution on YOUR website! A) x=7 5/6+5 1/3 x=47/6+32/6 x=79/6 x=13 1/6

Equations/691501: 3/8+p/8=3 1/8 1 solutions Answer 426721 by rfer(12662)   on 2012-12-08 18:04:17 (Show Source): You can put this solution on YOUR website! 3/8+p/8=3 1/8 p/8=25/8-3/8 p/8=22/8 p=22/8*8 p=176/8 p=22

Numbers_Word_Problems/691428: Six is less than or equal to the sum of 4 and -2x. 1 solutions Answer 426695 by rfer(12662)   on 2012-12-08 14:58:33 (Show Source): You can put this solution on YOUR website! 6 <= 4-2x 2 <= -2x 2/-2 <= x -1 <=x

Numeric_Fractions/691444: how do you get the answer for 4+17+(-29)+13+(-22)+(-3) 1 solutions Answer 426694 by rfer(12662)   on 2012-12-08 14:56:34 (Show Source): You can put this solution on YOUR website! 4+17-29+13-22-3=-20

expressions/691331: how i solve this parenthese? 2(xy+2x+2y+2)= 1 solutions Answer 426669 by rfer(12662)   on 2012-12-08 12:11:18 (Show Source): You can put this solution on YOUR website! 2xy+4x+4y+4

Percentage-and-ratio-word-problems/691383: A salesman’s commission is 4% on the first $25,000 in sales, and 5% on the remaining amount in sales beyond the first $25,000. What is his commission on $43,000 of sales? 1 solutions Answer 426667 by rfer(12662)   on 2012-12-08 12:07:19 (Show Source): You can put this solution on YOUR website! 25000*0.04=1000 (43000-25000)*0.05=900 1000+900=$1900

Money_Word_Problems/691384: in a restaurnat the bill for garys meal was thirteen punds and seventy pence he left a 10% tip work out how much tip he left 1 solutions Answer 426665 by rfer(12662)   on 2012-12-08 12:04:17 (Show Source): You can put this solution on YOUR website! 13.70/1.10=12.45