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 , 12660..12689, >>Next

 Rectangles/275354: the perimeter of a rectangle is 180 centimeters. The ratio of the length to the width is 7:3. Find the width of the rectangle1 solutions Answer 200898 by rfer(12675)   on 2010-02-28 21:57:58 (Show Source): You can put this solution on YOUR website!2(7x)+2(3x)=180 14x+6x=180 20x=180 x=9 7x=63 3x=27
 Graphs/275367: You are choosing from from two plans at a discount warehouse. Plan A offers an annual membership fee of \$300 and you pay 70% or the manufacturers recommended list price. Plan B offers an annual membership price of \$40 and you pay 90% of the manufacturers recommended list price. How many dollars of merchandise would you have to purchase in a year to pay the same amount under both plans? What is the cost for both plans?1 solutions Answer 200896 by rfer(12675)   on 2010-02-28 21:52:10 (Show Source): You can put this solution on YOUR website!300+.7x=40+.9x 240=.2x x=\$1200
 Probability-and-statistics/275386: In a homicide case 3 different witnesses picked the same man from a line up. The line up contained 5 men. If the identifications were made by random guesses, find the probability that all 3 witnesses would pick the same person.1 solutions Answer 200894 by rfer(12675)   on 2010-02-28 21:45:58 (Show Source): You can put this solution on YOUR website!1/5*1/5*1/5=1/125
 Money_Word_Problems/275395: Steven paid \$119.84 for a nw jacket. This included 7% sales tax. What was the cost of the jacket before taxes.1 solutions Answer 200891 by rfer(12675)   on 2010-02-28 21:43:54 (Show Source): You can put this solution on YOUR website!119.84/1.07=\$112
 Linear-equations/275422: find the slope of the line passing through the points (7,0) and (0,10)1 solutions Answer 200890 by rfer(12675)   on 2010-02-28 21:40:15 (Show Source): You can put this solution on YOUR website!-10/7 or -1 3/7
 Triangles/275402: In a triangle ABC, angle B is 4 times angle A, angle C is 2 degrees less than 5 times angle A.Find the size of the angles1 solutions Answer 200887 by rfer(12675)   on 2010-02-28 21:36:11 (Show Source): You can put this solution on YOUR website!a=x b=4x c=5x-2 x+4x+5x-2=180 10x=182 x=18.2 degrees 4x=72.8 degrees 5x-2=89 degrees
 Evaluation_Word_Problems/275421: Please help me solve: From a point on a straight road, John and Fred ride bicycles in the Same Direction. John rides 7 miles per hour and Fred rides 13 miles per hour. In how many hours will they be 60 miles apart? ** I know how to do it if they were going different directions but not sure of this problem since they are going SAME direction.1 solutions Answer 200886 by rfer(12675)   on 2010-02-28 21:32:10 (Show Source): You can put this solution on YOUR website!they are moving apart at 6 mph 60/6=10 hrs
 Numeric_Fractions/275403: What percent of 24 is 15?1 solutions Answer 200885 by rfer(12675)   on 2010-02-28 21:30:40 (Show Source): You can put this solution on YOUR website!15/24=.625=62.5%
 Travel_Word_Problems/275416: 2 cars leave town at the same time, going the same direction. ONe is traveling 40 mph, and the other is going 65 mph. In how many hours will they be 75 miles apart? I have erased my work several times, so I don't know what I have or had anymore.1 solutions Answer 200882 by rfer(12675)   on 2010-02-28 21:27:37 (Show Source): You can put this solution on YOUR website!moving apart at 25 mph 75/25=3 hrs
 Systems-of-equations/274725: Please Help me solve this problem. How do you solve 6y-x=-36 y=-3x? Using subsitution.1 solutions Answer 200467 by rfer(12675)   on 2010-02-26 20:09:31 (Show Source): You can put this solution on YOUR website!6(-3x)-x=-36 -18x-x=-36 -19x=-36 x=1.9 ------------ 6y-1.89=-36 6y=34.2 y=5.7 ------------- 5.7=-3(1.9)
 Volume/274664: I have a tank that is 7 feet at it's greatest width and 7 feet high. It has a bottom and no top. What is the area square footage of the tank so that I can paint a liner inside it? Thank you.1 solutions Answer 200463 by rfer(12675)   on 2010-02-26 19:51:22 (Show Source): You can put this solution on YOUR website!not enough information
 Numbers_Word_Problems/274674: Two positive numbers have a difference of 5. The larger number is 1 more than twice the smaller. Find the two number.1 solutions Answer 200461 by rfer(12675)   on 2010-02-26 19:45:28 (Show Source): You can put this solution on YOUR website!x-2x+1=5 x+1=5 x=4 2x+1=9
 Polynomials-and-rational-expressions/274641: A rectangular piece of land, bounded on one side by a river, is to be fenced on the other three sides. What is the larges possible area that can be enclosed by 300 metres of fencing?1 solutions Answer 200459 by rfer(12675)   on 2010-02-26 19:42:16 (Show Source): You can put this solution on YOUR website!100*100=10,000 sq m
 Pythagorean-theorem/274727: Find the measure of the diagonal of one face of a cube whose side measures 12 cm. 1 solutions Answer 200455 by rfer(12675)   on 2010-02-26 19:37:52 (Show Source): You can put this solution on YOUR website!12^2+12^2=c^2 144+144=288 sq rt of 288=17cm
 Numbers_Word_Problems/274679: One number is 5 more than 4 times another. Their sum is 35. Find the 2 numbers.1 solutions Answer 200454 by rfer(12675)   on 2010-02-26 19:36:04 (Show Source): You can put this solution on YOUR website!x+4x+5=35 5x=30 x=6 4x+5=29
 Triangles/274691: Angles of a triangle. The second angle of a triangular building lot is three times as large as the first. The third angle is 10 degrees more than the sum of the other two angles. Find the measure of the third angle.1 solutions Answer 200451 by rfer(12675)   on 2010-02-26 19:28:39 (Show Source): You can put this solution on YOUR website!x+3x+(x+3x+10)=180 8x+10=180 8x=170 x=21.25 degrees 3x=63.75 degrees x+3x+10=95 degrees
 Travel_Word_Problems/272919: Jack runs the mile in 3 minutes and 56.7 seconds. How long does it take him to run 2km at the same average speed? PLEASE SHOW HOW TO DO IT1 solutions Answer 199464 by rfer(12675)   on 2010-02-22 17:10:40 (Show Source): You can put this solution on YOUR website!one mile equals 1.61 km 3*60+56.7=236.7 sec for 1.61 km 236.7/1.61=147 sec per km 147*2=294 sec for 2 km or 4 min 54 sec
 Linear-equations/272607: find the slope of the line that passes through the points (-9,2) and (1,1). Reduce your answer. 1 solutions Answer 199358 by rfer(12675)   on 2010-02-21 22:30:39 (Show Source): You can put this solution on YOUR website!m=-1/10
 Inequalities/272605: I am not sure how to do this problem: 1/2+2/3=x/6 do i find the lcd and multiply that by the top?1 solutions Answer 199357 by rfer(12675)   on 2010-02-21 22:28:00 (Show Source): You can put this solution on YOUR website!1/2+2/3=x/6 3/6+4/6=x/6 7/6=x/6 6/1*7/6=x 42/6=x 7=x
 Exponents-negative-and-fractional/272546: -(-9+8y) Find an equivalent expression without parentheses.1 solutions Answer 199354 by rfer(12675)   on 2010-02-21 22:19:48 (Show Source): You can put this solution on YOUR website!+9-8y
 Rectangles/272555: is 100 inches greater than 3 yards 1 solutions Answer 199353 by rfer(12675)   on 2010-02-21 22:16:54 (Show Source): You can put this solution on YOUR website!3*36+100=208
 Numeric_Fractions/272569: 1/2 + (2/3 / 3/4) - (4/5*5/6)=?1 solutions Answer 199352 by rfer(12675)   on 2010-02-21 22:14:34 (Show Source): You can put this solution on YOUR website!1/2+(2/3/3/4)-(4/5*5/6)= 1/2+(2/3*4/3)-20/30= 1/2+8/9-20/30= 45/90+80/90-60/90=65/90=13/18
 percentage/272601: how do you find simple intrest when the percentage is a whole number and then a decimal like 8.51 solutions Answer 199347 by rfer(12675)   on 2010-02-21 22:08:08 (Show Source): You can put this solution on YOUR website!To change to a decimal move the decimal two places to the left. 8.5% becomes 0.085
 Permutations/272057: The probability of rain in a certain city is 1/8 on a given day. Find the probability that rain will fall on exactly one day of a three day visit. 1 solutions Answer 199159 by rfer(12675)   on 2010-02-20 21:34:39 (Show Source): You can put this solution on YOUR website!1/8*1/8*1/8=1/512
 Linear-systems/272069: 50% of what number is 451 solutions Answer 199158 by rfer(12675)   on 2010-02-20 21:30:29 (Show Source): You can put this solution on YOUR website!45/.5=90
 Linear-equations/272100: A right angle has one 37 degree angle - find the other two angles? The smallest angle in a triangle is 1/5 as large as the largest angle. The third angle is twice the smallest angle - find the three angles? Thank you.1 solutions Answer 199157 by rfer(12675)   on 2010-02-20 21:28:36 (Show Source): You can put this solution on YOUR website!A) 37, 53, 90 degrees B) .2x+2(.2x)+x=180 .2x+.4x+x=180 1.6x=180 x=112.5 degrees .2x=22.5 degrees 2(.2x)=45 degrees
 percentage/272132: Last year the population of the town where jared lives increased from 21,900 to 22,020. Using a calculator he computed the percent increase to the nearest whole percent to be 5%. What is his estimation?1 solutions Answer 199156 by rfer(12675)   on 2010-02-20 21:22:46 (Show Source): You can put this solution on YOUR website!the increase is 0.5% he is very far off
 Linear-equations/272103: Give the slope of the line that passes through the points (-5,-2) and (-6,-3) (put in simplest form) 1 solutions Answer 199155 by rfer(12675)   on 2010-02-20 21:19:28 (Show Source): You can put this solution on YOUR website!slope = 1 y=mx+b y=x+3
 Linear-systems/272110: the perimeter of a rectangle is 114 feet. it's length is three more than twice its width. find the dimensions of the rectangle please show the work1 solutions Answer 199154 by rfer(12675)   on 2010-02-20 21:16:25 (Show Source): You can put this solution on YOUR website!x+2x+3=114 3x=111 x=37 ft 2x+3=77 ft
 Money_Word_Problems/272131: FINANCE SUPPOSE THAT 7900 IS INVESTED AT 4.1% ANNUAL INTEREST RATE, COMPOUNDED MONTHLY. HOW MUCH MONEY WILL BE IN THE ACCOUNT IN A)11 MONTHS? B)18YRS?1 solutions Answer 199153 by rfer(12675)   on 2010-02-20 21:12:49 (Show Source): You can put this solution on YOUR website!A=P(1+r/n)^nt A=7900(1+.041/12)^11*.92 A=7900(1.00342)^10.12 A=7900(1.0352) A=\$8178.00 ---------------- A=7900(1.00342)^216 A=7900(2.09) A=\$16,511
 Pythagorean-theorem/272159: a cube-shaped container has a volume of 3.5L. What is the side length of the container, to the nearest tenth of a centimeter?1 solutions Answer 199152 by rfer(12675)   on 2010-02-20 21:00:51 (Show Source): You can put this solution on YOUR website!sq rt of 3.5=1.5 cm