Algebra ->  Tutoring on algebra.com -> See tutors' answers!      Log On

 Tutoring Home For Students Tools for Tutors Our Tutors Register Recently Solved
 By Tutor
| By Problem Number |

Tutor:

# Recent problems solved by 'rfer'

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/229717: v - 15 = -271 solutions Answer 170243 by rfer(12657)   on 2009-10-21 14:24:20 (Show Source): You can put this solution on YOUR website!v-15=-27 v=-12
 Problems-with-consecutive-odd-even-integers/229723: multiply. (-12)(-4)= (-3)(10)= 2000(5432)(-8)(0)=1 solutions Answer 170241 by rfer(12657)   on 2009-10-21 14:23:09 (Show Source): You can put this solution on YOUR website!+48 -30 -8.6912x10^7
 Problems-with-consecutive-odd-even-integers/229720: add -16+(-7)= -23+3.7= -5 1/2+(-2 1/2)=1 solutions Answer 170240 by rfer(12657)   on 2009-10-21 14:20:49 (Show Source): You can put this solution on YOUR website!-23 -19.3 -8
 Graphs/229650: Find the intercepts for the equation. x + y = 11 solutions Answer 170222 by rfer(12657)   on 2009-10-21 13:36:42 (Show Source): You can put this solution on YOUR website!x+y=1 0+y=1 x+0=1 y int=(0,1) x int=(1,0)
 Graphs/229652: Find the slope and the y-intercept of the line. -3x + y = 14 1 solutions Answer 170220 by rfer(12657)   on 2009-10-21 13:31:07 (Show Source): You can put this solution on YOUR website!y=mx+b y=3x+14 slope=m=3 y int=b=14 (0,14)
 Expressions-with-variables/229660: Find the x- and y-intercepts for 3x + 2y = 8. Please help, thank you.1 solutions Answer 170217 by rfer(12657)   on 2009-10-21 13:26:59 (Show Source): You can put this solution on YOUR website!y int= (0,4) x int= (8/3,0) or (2 2/3,0)
 Equations/229673: Two trains leave Chicago, one traveling east @ 30 mph and one traveling west @ 40 mph. When will the trains be 210 miles apart? Answer 3 hrs., but how do you set up the problem?1 solutions Answer 170215 by rfer(12657)   on 2009-10-21 13:24:54 (Show Source): You can put this solution on YOUR website!moving away from each other at 70 mph 210/70=3 hrs
 Equations/229671: Two cyclists begin traveling in the same direction on the same bike path. One travels at 15 mph, and the other travels at 12 mph. When will the cyclists be 10 miles apart?1 solutions Answer 170214 by rfer(12657)   on 2009-10-21 13:22:38 (Show Source): You can put this solution on YOUR website!speed moving apart equals 3 mph 10/3=3 1/3 hrs=3 hrs 20 min
 Polynomials-and-rational-expressions/229659: (x+5)(x+2)find the product 1 solutions Answer 170213 by rfer(12657)   on 2009-10-21 13:20:34 (Show Source): You can put this solution on YOUR website!(x+5)(x+2) x^2+2x+5x+10 x^2+7x+10
 Expressions-with-variables/229665: - 6 = 1 Please help me find x, thank you.1 solutions Answer 170212 by rfer(12657)   on 2009-10-21 13:18:57 (Show Source): You can put this solution on YOUR website!x/4-6=1 x/4=7 x=7*4 x=28
 Expressions-with-variables/229667: 9x - 2 = 13 1 solutions Answer 170211 by rfer(12657)   on 2009-10-21 13:17:34 (Show Source): You can put this solution on YOUR website!9x-2=13 9x=15 x=15/9 x=1 2/3
 Equations/229577: solve and check your answer a/4=7/2_1 solutions Answer 170207 by rfer(12657)   on 2009-10-21 12:23:27 (Show Source): You can put this solution on YOUR website!a/4=7/2 a=(7/2)(4/1) a=28/2 a=14
 Distributive-associative-commutative-properties/229590: (-y-9)(-5)1 solutions Answer 170205 by rfer(12657)   on 2009-10-21 12:07:37 (Show Source): You can put this solution on YOUR website!(-y-9)(-5) 5y+45
 Problems-with-consecutive-odd-even-integers/229596: find four consecutive integers whose sum is 621 solutions Answer 170204 by rfer(12657)   on 2009-10-21 12:06:37 (Show Source): You can put this solution on YOUR website!x+x+1+x+2+x+3=62 4x=56 x=14 x+1=15 x+2=16 x+3=17
 Polynomials-and-rational-expressions/229606: Multiply (4x+4)(5x^2+4x+9)1 solutions Answer 170203 by rfer(12657)   on 2009-10-21 12:03:34 (Show Source): You can put this solution on YOUR website!20x^3+16x^2+36x+20x^2+16x+36 20x^3+36x^2+52x+36
 Polynomials-and-rational-expressions/229604: Multiply. (w+1/5)(w+1/4)1 solutions Answer 170202 by rfer(12657)   on 2009-10-21 12:00:28 (Show Source): You can put this solution on YOUR website!w^2+1/4w+1/5w+1/5*1/4 w^2+9/20w+1/20
 Age_Word_Problems/229369: ruby an emily are twins. rebecca is 6 more than 2 times Ruby and Emily's age. Altogether the sum of their threee ages is 50.how old are emily and Ruby?1 solutions Answer 170141 by rfer(12657)   on 2009-10-21 00:07:34 (Show Source): You can put this solution on YOUR website!2x+2x+6=50 4x=44 x=11 yrs
 Coordinate-system/229381: when you have 2 sets of numbers, how do you know which set is for the up/down and which is left/rt1 solutions Answer 170140 by rfer(12657)   on 2009-10-21 00:00:02 (Show Source): You can put this solution on YOUR website!x axis is horizontal y axis is vertical in an ordered pair the first number is always the x axis the second is always the y axis (x,y)
 Quadratic-relations-and-conic-sections/229396: i am trying to find the y coordinate of the vertex. the x is -2 and when i plug it in to the equation i get 3(-2)^2+12(-2)+8 =-28, but the answer is supposed to be -4 can someone tell me what i am doing wrong?1 solutions Answer 170137 by rfer(12657)   on 2009-10-20 23:52:18 (Show Source): You can put this solution on YOUR website!I think you lost track of a sign some where. 3(-2)^2+12(-2)+8= 3(+4)-24+8= 12-24+8= 20-24=-4
 Distributive-associative-commutative-properties/229488: My problem is 14(1002)1 solutions Answer 170133 by rfer(12657)   on 2009-10-20 23:44:27 (Show Source): You can put this solution on YOUR website!14(1002) same as 14*1002=14028
 Age_Word_Problems/229505: Could you please help jessica is twice as old as tina. In nine years the sum of their ages will be 66 how old is each today?here's what I have so far... Tina equals t while jessica equals 2t...(T+9)+(2t+9)equals 661 solutions Answer 170131 by rfer(12657)   on 2009-10-20 23:41:29 (Show Source): You can put this solution on YOUR website!t+9+2t+9=66 3t+18=66 3t=48 t=16 2t=32 your equation works Good luck Bob
 Numbers_Word_Problems/229494: i need help with this problem Ken is thinking of a number,Nine more than the product of 4 and the number is 73. Find Kens number1 solutions Answer 170128 by rfer(12657)   on 2009-10-20 23:36:59 (Show Source): You can put this solution on YOUR website!4x+9=73 4x=64 x=16
 Exponents/229500: if y=3 then y3(y3-y)=1 solutions Answer 170127 by rfer(12657)   on 2009-10-20 23:33:53 (Show Source): You can put this solution on YOUR website!y^3(y^3-y)= 3^3(3^3-3)= 27(24)=648
 Travel_Word_Problems/229383: Katherine drove 230 miles. She drove 40mph for the first 2 hours and 50mhp for the rest of her drive. How long did she drive at 50mhp?1 solutions Answer 170077 by rfer(12657)   on 2009-10-20 19:51:53 (Show Source): You can put this solution on YOUR website!230-80=150/50=3 hrs
 Geometry_Word_Problems/229391: A farmer has 2400 feet of fencing and wants to enclose a rectangular area. What is the maximum area? (do not type in units) 1 solutions Answer 170074 by rfer(12657)   on 2009-10-20 19:49:13 (Show Source): You can put this solution on YOUR website!a square is max sq rt of 2400=49 49*49=2400
 Travel_Word_Problems/229388: I really need help. I'm just not getting this at all. Can someone please help? Two cars are traveling in the same direction. The first car is going 45 mi/h and the second car is going 60 mi/h. The first car left 2 hours before the second car. Explain how you could solve an equation with variables on both sides to find how long it will take the second car to catch up to the first.1 solutions Answer 170073 by rfer(12657)   on 2009-10-20 19:47:02 (Show Source): You can put this solution on YOUR website!car A is two hours ahead or 90 miles. overtake speed is 60-45=15 mph. 90/15=6 hrs to catch up. 2(45)/(60-45)=x
 Linear-equations/229195: Find the x and y intercept points of -3x-2y=121 solutions Answer 170026 by rfer(12657)   on 2009-10-20 17:37:10 (Show Source): You can put this solution on YOUR website!y int x=0 (0,-6) x int y=0 (-4,0) -3x-2y=12 -2y=3x+12 2y=-3x-12 y=(-3x-12)/2 y=-3(0)-12/2 y=-6 (0,-6) --------------------- -3x=2y+12 3x=-2y-12 x=(-2y-12)/3 x=-2(0)-12/3 x=-4 (-4,0)
 Problems-with-consecutive-odd-even-integers/229258: An angle (a) measures 20 degrees more than the measure of its complement. Find the angle's supplement. [Hint: what symbol do you use for the word "measures"????]1 solutions Answer 170024 by rfer(12657)   on 2009-10-20 17:30:00 (Show Source): You can put this solution on YOUR website!x+x+20=90 2x=70 x=35 degrees x+20=55 degrees ----------------- 180-55=125 degrees
 Miscellaneous_Word_Problems/229219: When 30% of a number is added to the number, the result is 54.6. What is the number?1 solutions Answer 170022 by rfer(12657)   on 2009-10-20 17:25:11 (Show Source): You can put this solution on YOUR website!x+.3x=54.3 1.3x=54.3 x=41.77
 Graphs/229265: How do you get an equation for a parallel line that passes through a given point? example: (3,4); y=2x-71 solutions Answer 170016 by rfer(12657)   on 2009-10-20 17:18:47 (Show Source): You can put this solution on YOUR website!Plot the point and use the same slope as the first equation. It becomes y=2x-2
 Linear-equations/229277: what is(1,-5),m-3/21 solutions Answer 170012 by rfer(12657)   on 2009-10-20 17:13:23 (Show Source): You can put this solution on YOUR website!y=mx+b y=-3/2x-3.5