# See tutors' answers!

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 'edjones'

edjones answered: 7568 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, >>Next

 Quadratic_Equations/277656: I have searched everywhere reading everything... I do not know how to turn this problem into a quadratic equation. Sammy takes 5 hours longer to complete 300 lines of code than Martin. Together Sammy and Martin can complete the code in 6 hours. How long does it take each programmer to complete the code if they complete on their own. At what speed is each programming lines per hour1 solutions Answer 202120 by edjones(7569)   on 2010-03-05 19:55:23 (Show Source): You can put this solution on YOUR website!Let s=hrs sammy takes and m=hrs martin takes s=m+5 in 1 hr martin gets 1/m of the job done and sammy gets 1/(m+5) done. 1/m + 1/(m+5) = 1/6 6(m+5)+6m=m(m+5) 6m+30+6m=m^2+5m m^2-7m-30=0 (m-10)(m+3)=0 m=10 hrs s=15 hrs . Ed
 Numbers_Word_Problems/277655: Which of the following lists 3/6, 9/12, and 15/18 in order from least to greatest?1 solutions Answer 202113 by edjones(7569)   on 2010-03-05 19:37:38 (Show Source): You can put this solution on YOUR website!3/6 (9/12)/2=4.5/6 (15/18)/3=5/6 . Ed
 Geometry_Word_Problems/277641: 1<1-2x/3<51 solutions Answer 202109 by edjones(7569)   on 2010-03-05 19:33:33 (Show Source): You can put this solution on YOUR website!1<(1-2x)/3<5 or 1<1-(2x/3)<5 ???
 Equations/277654: is this right 2+3=4+11 solutions Answer 202107 by edjones(7569)   on 2010-03-05 19:28:50 (Show Source): You can put this solution on YOUR website!yes!
 Radicals/277631: Please help me solve this problem: 5 radical 2 (3 radical 12 minus 4 radical 2) 1 solutions Answer 202105 by edjones(7569)   on 2010-03-05 19:27:43 (Show Source): You can put this solution on YOUR website!5sqrt(2)(3sqrt(12)-4sqrt(2)) 5sqrt(2)(3sqrt(4*3)-4sqrt(2)) 5sqrt(2)(6sqrt(3)-4sqrt(2)) 30sqrt(6)-20sqrt(4) 30sqrt(6)-40 . Ed
 logarithm/277424: log x - log 10 = 14 now i've got it to log x/10 = 14 and then x/10 = 10^14, but then what do i do?1 solutions Answer 201971 by edjones(7569)   on 2010-03-04 23:54:12 (Show Source): You can put this solution on YOUR website!log(x)-log(10)=14 10^(log(x))/10^(log(10))=10^14 x/10=10^14 x=10^15 . Ed
 Probability-and-statistics/277427: A man is to play a game as follows. In three tosses of balanced coin, he will get a reward of RS. 20,000,RS.10,000 ,RS. 5,000 and no reward if he gets 3 tails, 2 tails, 1 tail and no tail respectively. whats is his expected return. If the entrance fee for contest is Rs. 7,000 will he play the game? 1 solutions Answer 201970 by edjones(7569)   on 2010-03-04 23:47:24 (Show Source): You can put this solution on YOUR website!(t+h)^3= t^3=.5^3=1/8 3t^2h=3*.5^2*.5=3/8 3th^2=3/8 h^3=1/8 . In 8 tries he spends 7000*8=56000 and wins 20000 all tails 30000 2 tails 15000 one tail ------add 65000 . 65000-56000=9000 is the expected return after 8 tries . 9000/8=RS 1125 expected return per try. . Ed
 test/276964: Exactly how many degrees are there between the hands of a clock at 3:40 pm1 solutions Answer 201776 by edjones(7569)   on 2010-03-04 02:20:04 (Show Source): You can put this solution on YOUR website!The hr hand is 2/3 the way to the 4 or 11/36 around the clock. 11/36 * 360 = 110 deg The minute hand is 8/12 around the clock. 8/12 * 360 = 240 deg . 240-110=130 degrees between the hands. . Ed
 Exponential-and-logarithmic-functions/276971: solve for x: log(of base 7)x = (1/2)log(of base 7)36-(4)log(of base 7)21 solutions Answer 201774 by edjones(7569)   on 2010-03-04 02:06:43 (Show Source): You can put this solution on YOUR website!log(of base 7)x = (1/2)log(of base 7)36-(4)log(of base 7)2 log[7](x)=log[7](sqrt(36))-log[7]((2)^4) log[7](x)=log[7](6)-log[7](16) 7^(log[7](x))=7^(log[7](6))/7^(log[7](16)) x=6/16 =3/8 . Ed
 Polynomials-and-rational-expressions/276972: If the sides of a square are lengthened by 7cm, the area becomes 144cm^2. Find the length of a side of the original square.1 solutions Answer 201773 by edjones(7569)   on 2010-03-04 01:56:15 (Show Source): You can put this solution on YOUR website!sqrt(144)=12 side of new square 12-7=5 side of first square
 Equations/276975: Can you pleas help me with this equation. Solve using the addition and multiplication principles. 5/6(5x-2)-2/3 ≥ 11/61 solutions Answer 201771 by edjones(7569)   on 2010-03-04 01:53:06 (Show Source): You can put this solution on YOUR website!5/6(5x-2)-2/3 ≥ 11/6 5(5x-2)-4>=11 multiply each side by 6 (LCM) 25x-10-4>=11 25x>=25 x>=1 . Ed
 Inequalities/276979: -5x<11+4x1 solutions Answer 201769 by edjones(7569)   on 2010-03-04 01:48:33 (Show Source): You can put this solution on YOUR website!-5x<11+4x -9x<11 x>-11/9 reverse the inequality sign dividing by a negative number. . Ed
 Linear-equations/276990: Without graphing, identify the slope and the y-intercept y=-4x+5 thank you : )1 solutions Answer 201768 by edjones(7569)   on 2010-03-04 01:44:55 (Show Source): You can put this solution on YOUR website!y=-4x+5 -4=slope (number in front of x) 5=y intercept (x=0) . Ed
 Quadratic_Equations/277002: FACTOR COMPLETELY 2C^2-5CD-42D^21 solutions Answer 201767 by edjones(7569)   on 2010-03-04 01:38:05 (Show Source): You can put this solution on YOUR website!2c^2-5cd-42d^2 2*-42=-84; two factors of -84 who's sum is -5= -12, +7 2c^2-12cd+7cd-42d^2 2c(c-6d)+7d(c-6d) factoring by grouping. (2c+7d)((c-6d) . Ed
 Quadratic_Equations/277005: FACTOR COMPLETELY T^2-1441 solutions Answer 201766 by edjones(7569)   on 2010-03-04 01:29:03 (Show Source): You can put this solution on YOUR website!t^2-144 (t+12)(t-12) . Ed
 Quadratic_Equations/277007: FACTOR COMPLETELY 16X^2+9Y^21 solutions Answer 201765 by edjones(7569)   on 2010-03-04 01:27:50 (Show Source): You can put this solution on YOUR website!doesn't factor
 Quadratic_Equations/277008: FACTOR COMPLETELY x^2+6=-51 solutions Answer 201764 by edjones(7569)   on 2010-03-04 01:26:03 (Show Source): You can put this solution on YOUR website!x^2+6=-5 x^2=-11 x=+-sqrt(11)i . Ed
 Quadratic_Equations/277009: FACTOR COMPLETELY X^2-6X=01 solutions Answer 201762 by edjones(7569)   on 2010-03-04 01:24:08 (Show Source): You can put this solution on YOUR website!x^2-6x=0 x(x-6)=0 x=0, x=6 . Ed
 Equations/277023: I do not understand the steps in a few fractional equation problems, but I would like to know how to work this one out, so I wont be confused in the future. n - 16/n = 96/51 solutions Answer 201761 by edjones(7569)   on 2010-03-04 01:18:41 (Show Source): You can put this solution on YOUR website!n - 16/n = 96/5 5n^2-80=96n multiply each side by 5n (LCM) 5n^2-96n-80=0 5n^2+4n-100n-80=0 n(5n+4)-20(5n+4)=0 factoring by grouping. (n-20)(5n+4)=0 5n=-4, n=-4/5 n=20 . Ed
 Equations/277025: How could I solve this equation dealing with fractions. x/x+4 - 2 = 12/x-121 solutions Answer 201759 by edjones(7569)   on 2010-03-04 01:09:36 (Show Source): You can put this solution on YOUR website!x/(x+4) - 2 = 12/(x-12) x(x-12)-2(x+4)(x-12)=12(x+4) multiply each side by (x+4)(x-12) (LCM) x^2-12x-2(x^2-8x-48)=12x+48 x^2-12x-2x^2+16x+96=12x+48 x^2+8x-48=0 subtract the left side from the right (x-4)(x+12)=0 x=4, x=-12 . Ed
 Permutations/276988: In how many different ways can a panel of 12 jurors and 2 alternates be chosen from a group of 20 prospective jurors? 1 solutions Answer 201747 by edjones(7569)   on 2010-03-03 23:29:21 (Show Source): You can put this solution on YOUR website!Permutation: 20!/(20-12)!=60339831552000 ways. . Ed
 Permutations/276980: In how many ways can 10 letters: 2 C’s, 3 D’s, and 5 F’s be awarded to 10 politicians, one letter for each politician?1 solutions Answer 201745 by edjones(7569)   on 2010-03-03 23:21:57 (Show Source): You can put this solution on YOUR website!Permutation: 10!/(2!3!5!)=2,520 ways. . Ed
 Permutations/276981: A survey of 51 pet owners revealed that 32 owned dogs, 38 owned cats, and 3 owned neither dogs nor cats. How many owned both dogs and cats?1 solutions Answer 201744 by edjones(7569)   on 2010-03-03 23:14:20 (Show Source): You can put this solution on YOUR website!51-3=48 own cars or dogs or both. Make a Venn diagram and put 3 in the rectangle but out side the circles. Let x= owned both dogs and cats. That is the intersection of the 2 circles. 32-x+38-x+x=48 the union of the 2 circles IE everything in the circles. 32-x+38-x+x=48 70-x=48 -x=-22 x=22 owned both dogs and cats. FYI: 10 goes to the left of the intersection and 16 to the right. . Ed
 test/276966: the time allowed for completing a certain piece of work is 40 days. By extending the time by 10 days we find that 25 fewer man will be needed. How many men are required to finish the work in 40 days?1 solutions Answer 201743 by edjones(7569)   on 2010-03-03 22:53:34 (Show Source): You can put this solution on YOUR website!Let x=number of men needed to finish job in 40 days 40 * x = 40x man-days required 50 * x-25 = 50(x-25) man-days 40x=50(x-25) 40x=50x-1250 -10x=-1250 x=125 number of men needed to finish job in 40 days. . Ed
 Permutations/276952: Fifteen dogs enter a Goofy Dog contest. In how many different ways can a champion, a first runner-up, and a second runner-up be selected?1 solutions Answer 201738 by edjones(7569)   on 2010-03-03 22:29:18 (Show Source): You can put this solution on YOUR website!nPr=n!/(n-r)! Permutation 15P3=(15*14*13*12!)/12! =2730 ways . Ed
 Equations/276416: 3x+1/2=5/21 solutions Answer 201445 by edjones(7569)   on 2010-03-02 22:38:09 (Show Source): You can put this solution on YOUR website!3x + 1/2 = 5/2 3x=2 x=2/3 . Ed
 Rectangles/276401: When the length of each side of a square is increased by 5 inches, the area of the resulting square is 2.25 times the area of the original square. What is the area of the original square?1 solutions Answer 201443 by edjones(7569)   on 2010-03-02 22:30:40 (Show Source): You can put this solution on YOUR website!Let s=original side A=s^2 . (s+5)^2=2.25s^2 s^2+10s+25=2.25s^2 1.25s^2-10s-25=0 subtract the left side from the right. s^2-8s-20=0 divide each side by 1.25 (s+2)(s-10)=0 s=10 10^2=100 sq in. area of the original square. . Ed
 Probability-and-statistics/276406: Given that P(A or B) = 1/3, P(A) = 1/6, and P(A and B) = 1/8, find P(B). 7/24 is the answer but I would really love to know why. This question is worded in a very confusing manner. 1 solutions Answer 201440 by edjones(7569)   on 2010-03-02 22:13:23 (Show Source): You can put this solution on YOUR website!Become familiar with Venn diagrams and this will become much simpler. In the intersection of the 2 circles put 1/8. 1/6 - 1/8 = 1/24 put this in the semicircle to left of 1/8 1/3 is the union of the 2 circles. 1/24 + 1/8 + x = 1/3 x=1/6 put this in the semicircle right of 1/8 1/8 + 1/6 = 7/24 P(B) . Ed .
 Probability-and-statistics/276399: You are taking a multiple-choice test that has 12 questions. Each of the questions has 5 choices, with one correct choice per question. If you select one of these options per question and leave nothing blank, in how many ways can you answer the questions? The answer is 244,140,625 but why?1 solutions Answer 201437 by edjones(7569)   on 2010-03-02 21:50:45 (Show Source): You can put this solution on YOUR website!5^12=244140625 . Ed
 Polynomials-and-rational-expressions/276312: pplease help me solve this problem find a polynomial of degree 3 that has zeros 1, -2, and 3, and which the coefficient of x^2 is 3.1 solutions Answer 201435 by edjones(7569)   on 2010-03-02 21:43:38 (Show Source): You can put this solution on YOUR website!(x-1)(x+2)(x-3) =x^3-2x^2-5x+6=0 -2a=3 present coefficient of x^2 must be changed from -2 to 3 a=-3/2 -3/2(x^3-2x^2-5x+6)=0 -3x^3/2 +3x^2 +15x/2 -9=0 -1.5x^3+3x^2+7.5x-9 . Ed
 Exponential-and-logarithmic-functions/276317: e^-3x=5 is the answer 5? Teachers examples weren't helpful!1 solutions Answer 201427 by edjones(7569)   on 2010-03-02 21:21:58 (Show Source): You can put this solution on YOUR website!e^-3x=5 ln(e^-3x)=ln(5) -3x=ln(5) x=ln(5)/-3 x=1.609/-3 x=-.536 . Ed