Tutor:

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

---

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

test/520605: 2r-6=0 1 solutions Answer 346136 by edjones(7569)   on 2011-10-24 22:23:32 (Show Source): You can put this solution on YOUR website! 2r-6=0 2r=6 add 6 to each side. r=3 divide each side by 2. . Ed

logarithm/520594: solve the equation. e^(x+2)= 7 1 solutions Answer 346134 by edjones(7569)   on 2011-10-24 22:21:47 (Show Source): You can put this solution on YOUR website! e^(x+2)= 7 ln(e^(x+2))= ln(7) x+2=ln(7) x=ln(7)-2=-.0541 . Ed

Equations/520602: 63 divided by r = 9 please show the work. then there 17 = 153 divided by q I am stomped. 1 solutions Answer 346131 by edjones(7569)   on 2011-10-24 22:15:34 (Show Source): You can put this solution on YOUR website! 9=63/r 9r=63 multiply each side by r. r=7 divide each side by 9. . Ed

Exponents/520600: I am suppose to reduce 15x^3/6x^-3 Would the answer be 5x^6/2 ? 1 solutions Answer 346129 by edjones(7569)   on 2011-10-24 22:12:19 (Show Source): You can put this solution on YOUR website! 15x^3/6x^-3 =15x^3 / 6/x^3 =15x^3 * x^3/6 =15x^6/6 =5x^6/2 . Ed

logarithm/520597: solve the equation. 6 ln 9x = 12 1 solutions Answer 346128 by edjones(7569)   on 2011-10-24 22:07:23 (Show Source): You can put this solution on YOUR website! 6*ln(9x)=12 ln(9x)=2 e^ln(9x)=e^2 x=e^2/9 . Ed

Radicals/520596: If i have a radical equation with two x's in the equation how would i begin to solve the equation 1 solutions Answer 346123 by edjones(7569)   on 2011-10-24 22:00:01 (Show Source): You can put this solution on YOUR website! Submit a problem.

Polynomials-and-rational-expressions/520583: two cars travel the same distance. car 1 travels at 50 mph and car 2 at 65 mph. If it takes car 1 one more hour to travel than car 2 how far did the cars travel? remember d= rt a. write an expression to represent the distance car 2 travels b. write an expression to represent the distance car 1 travels c. use these expressions to find time car 2 traveled d. use this information to determine the distance traveled 1 solutions Answer 346122 by edjones(7569)   on 2011-10-24 21:59:15 (Show Source): You can put this solution on YOUR website! rt=rt because d[1]=d[2] 50(t+1)=65t 50t+50=65t 15t=50 t=10/3=3:20 65 * 10/3 = 216 2/3 mi. Distance they traveled. . Ed

Permutations/520572: How many bit strings of length 9 either begin with 2 bit(s) equal to 0 or end with 3 bit(s) equal to 1? 1 solutions Answer 346117 by edjones(7569)   on 2011-10-24 21:45:27 (Show Source): You can put this solution on YOUR website! 00xxxxxxx or xxxxxx111 or both (1/2)^2 + (1/2)^3 = 3/8 . Ed

Exponents/520576: help show work for simplifying: sqrt(72) 1 solutions Answer 346112 by edjones(7569)   on 2011-10-24 21:30:49 (Show Source): You can put this solution on YOUR website! sqrt(72) =sqrt(9*4*2) =6sqrt(2) . Ed

Triangles/520559: help me with number 13, get me the answer please. http://i54.tinypic.com/2yzj66d.jpg 1 solutions Answer 346109 by edjones(7569)   on 2011-10-24 21:28:38 (Show Source): You can put this solution on YOUR website! The single slash through each side show that the triangle is equilateral. 6x-5=5x x=5 Each side is 25 units long. . Ed

Rate-of-work-word-problems/520542: Rosita can wax her car in 1hr(s). When she works together with Debbie, they can wax the car in 15 min(s). How long would it take Debbie, working by herself, to wax the car? Hint: convert hours to minutes. 1 solutions Answer 346104 by edjones(7569)   on 2011-10-24 21:10:38 (Show Source): You can put this solution on YOUR website! Rosita can do 1/60 job in 1 min. d=minutes it takes Debbie to do the job. Debbie can do 1/d the job in 1 min. Together they can do 1/15 the job in 1 min. 1/60 + 1/d = 1/15 d+60=4d Multiply by 60d. 3d=60 d=20 min . Ed

Probability-and-statistics/510294: 5 cards are drawn from an ordinary deck of 52 playing cards. Find the probability of getting two pairs (for example, A-A-5-5-Q or 4-4-7-7-A). The answer is 0.0475, but how do I get to that answer? 1 solutions Answer 341798 by edjones(7569)   on 2011-10-05 22:20:29 (Show Source): You can put this solution on YOUR website! Two pair can have any two of 13 ranks and each pair can have any two of four suits. The other card can have any of the 11 remaining ranks and any suit. (13C2*(4C2)^2*11C1*4C1)/52C5 =123552/2598960 =0.0475... . Ed

Quadratic_Equations/510334: I need help in figuring out how to set this problem up and solving same: Five divided by the sum of a number and 7, minus the quotient of 3 and the difference of the number and 7 is equal to 6 times the reciprocal of the difference of the number squared and 49. What is the number? Thank You To Any and All ... 1 solutions Answer 341795 by edjones(7569)   on 2011-10-05 22:04:54 (Show Source): You can put this solution on YOUR website! 5/(x+7) - 3/(x-7) = 6/(x^2-49) 5(x-7)-3(x+7)=6 Multiply each side by (x+7)(x-7) 5x-35-3x-21=6 2x=62 x=31 . Ed

Probability-and-statistics/510336: which is greater A or B. assume a and b are positive numbers. A is 20% of B 1 solutions Answer 341794 by edjones(7569)   on 2011-10-05 21:51:25 (Show Source): You can put this solution on YOUR website! B

sets-and-operations/510299: There are a total of 108 foreign language students in a high school where they offer Spanish, French, and German. There are 21 students who take at least 2 languages at once. If there are 44 students of Spanish, 45 students of French, and 40 students of German, how many students take all three languages at once? 1 solutions Answer 341793 by edjones(7569)   on 2011-10-05 21:50:38 (Show Source): You can put this solution on YOUR website! Let 21 take spanish and french. Then 44-21=23 take only spanish. 45-21=24 take only french. 40 take only German. 21+23+24+40=108 None take all 3 languages. . Ed

logarithm/510308: How would I solve this logarithmic equation loga(x) + loga (x-2)= loga (x+4) 1 solutions Answer 341785 by edjones(7569)   on 2011-10-05 21:25:59 (Show Source): You can put this solution on YOUR website! loga(x) + loga (x-2)= loga (x+4) a^loga(x) * a^loga (x-2)= a^loga (x+4) x(x-2)=x+4 x^2-2x-x-4=0 x^2-3x-4=0 (x-4)(x+1)=0 x=4 . Ed

Numbers_Word_Problems/509670: twice the difference of a number and eleven 1 solutions Answer 341577 by edjones(7569)   on 2011-10-04 23:19:23 (Show Source): You can put this solution on YOUR website! 2(x-11)

Age_Word_Problems/509676: I am a number with the same number of tens as ones. The sum of my digits is less than 5. I am a number greater than 15. What number am I? 1 solutions Answer 341576 by edjones(7569)   on 2011-10-04 23:17:46 (Show Source): You can put this solution on YOUR website! 22

Inequalities/509722: Inequalities solving: 1. x + 2 > 8 2. 7- 4x < 8 3. 10x - 9 > -2x - 3 Thanks! 1 solutions Answer 341575 by edjones(7569)   on 2011-10-04 23:14:28 (Show Source): You can put this solution on YOUR website! 1) x + 2 > 8 x>6 . Ed

Percentage-and-ratio-word-problems/509723: 1=1/8(56x+8) 1 solutions Answer 341573 by edjones(7569)   on 2011-10-04 23:12:59 (Show Source): You can put this solution on YOUR website! (1/8)(56x+8)=1 7x+1=1 7x=0 x=0 . Ed

Probability-and-statistics/509724: If two cards are drawn without replacement from a 52 card deck, find the probability that the second card is an ace, given that the first card was an ace. 1 solutions Answer 341572 by edjones(7569)   on 2011-10-04 23:09:52 (Show Source): You can put this solution on YOUR website! 3/51

Probability-and-statistics/509642: Which of the following statements is NOT true? (a) In a symmetric distribution, the mean and the median are equal. (b) The first quartile is equivalent to the twenty-fifth percentile. (c) In a symmetric distribution, the median is halfway between the first and third quartiles. (d) The median is always greater than the mean. (e) The range is the difference between the largest and the smallest observation in the data set. 1 solutions Answer 341570 by edjones(7569)   on 2011-10-04 23:06:38 (Show Source): You can put this solution on YOUR website! d

Complex_Numbers/509701: can you help me solve for x x-3/5=3/10 1 solutions Answer 341562 by edjones(7569)   on 2011-10-04 22:50:46 (Show Source): You can put this solution on YOUR website! (x-3)/5 = 3/10 2(x-3)=3 multiply each side by 10. 2x-6=3 2x=9 x=9/2 . Ed

test/509711: |x|-3=5 1 solutions Answer 341557 by edjones(7569)   on 2011-10-04 22:45:26 (Show Source): You can put this solution on YOUR website! |x|-3=5 |x|=8 x=8, x=-8 . Ed

Radicals/509702: x=8*(squarerootof)x 1 solutions Answer 341555 by edjones(7569)   on 2011-10-04 22:43:59 (Show Source): You can put this solution on YOUR website! x=8sqrt(x) x^2=64x Square each side. x^2-64x=0 x(x-64)=0 x=0, x=64 . Ed

Graphs/509682: solve the inequality algebraically 13x-11>2 1 solutions Answer 341554 by edjones(7569)   on 2011-10-04 22:38:34 (Show Source): You can put this solution on YOUR website! 13x-11>2 13x>13 x>1 . Ed

Circles/509704: The circumference of the wheel of the tricycle of Timothy is 1/4 of the wheel of the car from his father. If the circumference of the wheel of his father is 16 π (pi), which is the radius of the wheel of Timothy? 1 solutions Answer 341552 by edjones(7569)   on 2011-10-04 22:30:54 (Show Source): You can put this solution on YOUR website! t=timmy C(t)=16pi/4=4pi=pi*d r(t)=d/2=4/2=2 . Ed

Angles/509689: find the measure of an angle that is 38 degrees more than it's complement? 1 solutions Answer 341551 by edjones(7569)   on 2011-10-04 22:26:16 (Show Source): You can put this solution on YOUR website! a+c=90 c=90-a a=90-a+38 2a=128 a=64 . Ed

Miscellaneous_Word_Problems/509697: two mechanics, one worked 10 hours, the other 5 hours. Total charge was $1550. Sum of both mechanics was $205. What is per hour for each mechanic? 1 solutions Answer 341548 by edjones(7569)   on 2011-10-04 22:19:44 (Show Source): You can put this solution on YOUR website! x+y=205 y=205-x . 10x+5y=1550 10x+5(205-x)=... 10x+1025-5x=... 5x=525 x=$105./hr y=$100./hr . Ed

test/509685: I need help with finding domain and range of a function. For ex. f(x)=2x+3 1 solutions Answer 341543 by edjones(7569)   on 2011-10-04 22:12:29 (Show Source): You can put this solution on YOUR website! domain is all real numbers. range is all real numbers also. . Ed

Probability-and-statistics/509660: . STAYING IN TOUCH- In a poll conducted in 2007, 200 adults ages 18 yr and older were asked how frequently they are in touch with their parents by phone. The results of the poll were as follows: Answer Monthly Weekly Daily Don’t know Less Respondents, % 11 47 32 2 8 If a person who participated in the poll is selected at random, what is the probability that the person said he or she kept in touch with his or her parents a. Once a week? b. At least once a week? 1 solutions Answer 341540 by edjones(7569)   on 2011-10-04 22:03:18 (Show Source): You can put this solution on YOUR website! I would throw the "Don't know" out. This leaves 1-.02=.98 a).47/.98=.480 . b)(.47+.32)/.98=.806 . Ed