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'

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

 percentage/454863: In tryouts for a school play, 30% of the participants were eliminated the first week. Of those remaining, 20% were chosen. If 7 were chosen, how many tried out?1 solutions Answer 312335 by edjones(7569)   on 2011-05-28 01:35:39 (Show Source): You can put this solution on YOUR website!Let x=number that tried out. (x-.3x)*.2=7 .2*.7x=7 .14x=7 x=50 . Ed
 Numbers_Word_Problems/454908: what is the answer to the question: what two digit number that is prime and even and the numbers are the same 1 solutions Answer 312334 by edjones(7569)   on 2011-05-28 01:24:08 (Show Source): You can put this solution on YOUR website!The only number that is even and prime is 2.
 Polynomials-and-rational-expressions/454912: choose the best response to describe the polynomial :-4x^3-2x^2+3x the coefficients are all negative. the leading coefficient is negative it is a binomial it is of 4 degree 1 solutions Answer 312333 by edjones(7569)   on 2011-05-28 01:20:49 (Show Source): You can put this solution on YOUR website!the leading coefficient is negative
 Probability-and-statistics/454919: When playing bingo, 75 balls are placed in a bin and balls are selected at random. Each ball is marked with a letter and number as indicated by the following chart. Playing Bingo When playing bingo, 75 balls are placed in a bin and balls are selected at random. Each ball is marked with a letter and number as indicated in the following chart. B I N G O 1-15 16-30 31-45 46-60 61-75 For example, there are balls marked B1, B2, up to B15; I16, I17, up to I30; and so on. Now, assuming one bingo ball is selected at random, determine 42. the probability that it does not contain the letter G. 1 solutions Answer 312330 by edjones(7569)   on 2011-05-28 00:45:42 (Show Source): You can put this solution on YOUR website!60/75 = 4/5
 Triangles/454922: How do you solve x/20 = ?/121 solutions Answer 312328 by edjones(7569)   on 2011-05-28 00:34:31 (Show Source): You can put this solution on YOUR website!Let y = ? x/20 = y/12 y=12x/20 =3x/5 . Ed
 Miscellaneous_Word_Problems/454924: one word for the shop selling flowers1 solutions Answer 312326 by edjones(7569)   on 2011-05-28 00:30:47 (Show Source): You can put this solution on YOUR website!Florists
 Probability-and-statistics/454934: Suppose we want to determine the (binomial) probability (p) of getting 0 (zero) heads in 5 flips of a coin. Using Table 2 in Appendix B of the text, what values of n, x, and p would we use to look up this probability, and what would be the probability? Table 2 states n=5 x=0 0.01 0.05 0.10 0.20 0.30 0.40 0.50 0.60 0.70 .951 .774 .590 .328 .168 .078 .031 .010 .002 1 solutions Answer 312324 by edjones(7569)   on 2011-05-28 00:27:27 (Show Source): You can put this solution on YOUR website!0.5^5=.03125 probability (p) of getting 0 (zero) heads in 5 flips of a coin.
 Percentage-and-ratio-word-problems/454935: In a capture-recapture study, a biologist tagged and released 387 deer. A month later she captured 56 deer, 28 of which had tags. About how many deer were in the population?1 solutions Answer 312320 by edjones(7569)   on 2011-05-28 00:21:20 (Show Source): You can put this solution on YOUR website!x/47 = 274/13 x~991 . Ed
 Probability-and-statistics/454590: While shooting arrows, William Tell can hit an apple 9 out of 10 times. What is the probability that he will hit exactly 4 out of 7 times?1 solutions Answer 312136 by edjones(7569)   on 2011-05-26 21:20:32 (Show Source): You can put this solution on YOUR website!p=.9, q=.1 (p+q)^7 expansion of a binomial. nCr=7C4=35 coefficient 35p^4q^3 =.02296 the probability that he will hit exactly 4 out of 7 times. . Ed
 Probability-and-statistics/454587: How many different soccer teams consisting of 11 players can be formed from 18 players?1 solutions Answer 312135 by edjones(7569)   on 2011-05-26 21:15:08 (Show Source): You can put this solution on YOUR website!nCr=combinations of n things taken r at a time=n!/((n-r)!*r!) 18C11 =31,824 teams . Ed
 Permutations/454591: 10 people are going on a camping trip in 3 cars that hold 5,2, and 4 passengers, respectively. How many ways is it possible to transport the 10 people to their campsite?1 solutions Answer 312133 by edjones(7569)   on 2011-05-26 21:11:18 (Show Source): You can put this solution on YOUR website!I'll let you do the calculations 5 seater has only 4 people : 10C4 * 6C4 * 2C2 4 seater has only 3 people : 10C5 * 5C3 * 2C2 2 seater has only 1 person : 10C5 * 5C4 * 1C1 ADD the three results for the answer. . Ed
 Probability-and-statistics/454594: Three different gaming machines are in a line along a wall. The machines guarantee the following outputs with listed probabilities: Machine A: P(1)=1/7 ; P(3)=3/7 ; P(7)=3/7 Machine B: P(4)=1 Machine C: P(3)=5/9 ; P(6)=4/9 Suppose that you want to select the game giving the highest average output over a long period of time. Which machine would you select? Why?1 solutions Answer 312132 by edjones(7569)   on 2011-05-26 20:57:16 (Show Source): You can put this solution on YOUR website!Expectation=n*p A: 1/7 * 1 = 1/7 3 * 3/7 = 9/7 7 * 3/7 = 21/7 . 31/7 expectation = 4 3/7 . B: 4*1=4 expectation . C: 3 * 5/9 = 15/9 6 * 4/9 = 24/9 . 39/9 expectation = 4 3/9 . Select A because it has the highest expectation. . Ed
 Probability-and-statistics/454589: A shipment of 10 television sets contains 3 defective sets. How many ways can a hospital purchase 4 of these sets and receive at least 2 of the defective sets?1 solutions Answer 312130 by edjones(7569)   on 2011-05-26 20:46:55 (Show Source): You can put this solution on YOUR website!3 defective and 7 ok (3C3 * 7C1) + (3C2 * 7C2) =7+63 =70 ways . Ed
 Permutations/454576: How many ways can a florist arrange 5 bouquets on a display shelf?1 solutions Answer 312129 by edjones(7569)   on 2011-05-26 20:36:57 (Show Source): You can put this solution on YOUR website!5! =5*4*3*2 =120 ways . Ed
 Permutations/454579: how many ways can you select 3 bananas from a group of 9????1 solutions Answer 312128 by edjones(7569)   on 2011-05-26 20:33:19 (Show Source): You can put this solution on YOUR website!9C3 =9!/((9-3)!3!) =84 ways . Ed
 Probability-and-statistics/454580: Bob takes an online IQ test and finds that his IQ according to the test is 134. Assuming that the mean IQ is 100, the standard deviation is 15, and the distribution of IQ scores is normal, what proportion of the population would score higher than Bob? Lower than Bob? 1 solutions Answer 312126 by edjones(7569)   on 2011-05-26 20:30:55 (Show Source): You can put this solution on YOUR website!z=(134-100)/15 =2.267 By finding the area under the curve for the z we find that .0117 score higher and .9883 score lower in the population. . Ed
 test/454581: The circulation of a newsletter decreased from 3,200 to 2,464. What was the percent of decrease in circulation?1 solutions Answer 312124 by edjones(7569)   on 2011-05-26 20:22:35 (Show Source): You can put this solution on YOUR website!3200-2464=736 subscribers lost 736/3200=.23=23% percent of decrease. . Ed
 Probability-and-statistics/454512: A co-ed soccer team has 9 women and 7 men on its roster. 6 players play on the field at one time. a) What is the probability the starting lineup will have 3 men and 3 women on it? b) What is the probability the starting lineup will have at least 5 men on it c) What is the expected number of women on the team?1 solutions Answer 312123 by edjones(7569)   on 2011-05-26 20:18:57 (Show Source): You can put this solution on YOUR website!a) (9C3 * 7C3)/16C6 = .3671 . b) (7C6 + (7C5 * 9C1))/16C6 = .02448 . c)7/16 * 6 = 2.625 expected number of women on the team. . Ed
 Probability-and-statistics/454513: Speed trap on the highway set by the O.P.P. shows that the mean speed of cars is 103.4 km/h with a standard deviation of 9.8 km/h. The posted speed limit on the highway is 100 km/h. What percentage of drivers are technically driving under the speed limit? 1 solutions Answer 312117 by edjones(7569)   on 2011-05-26 19:51:11 (Show Source): You can put this solution on YOUR website!z=(100-103.4)/9.8 =-.3469 Area under curve from -.3469 to 0 is 0.1357 .5 - 0.1357 = .3643 = 36.43% . Ed
 Probability-and-statistics/454515: Speed trap on the highway set by the O.P.P. shows that the mean speed of cars is 103.4 km/h with a standard deviation of 9.8 km/h. The posted speed limit on the highway is 100 km/h. Speeders caught traveling 25 km/h or more over the speed limit are subject to a \$5000 fine. What percentage of speeders will be fined \$5000?1 solutions Answer 312113 by edjones(7569)   on 2011-05-26 19:42:48 (Show Source): You can put this solution on YOUR website!z=(125-103.4)/9.8 =2.204 Area under the curve for alpha of 2.204 is 1.376% . Ed
 test/454563: Please help! In tremendous awkwardness! 1 solutions Answer 312110 by edjones(7569)   on 2011-05-26 19:32:56 (Show Source): You can put this solution on YOUR website!60% of 50 (there is a percent key [shift 5] on the keyboard) =50*0.6=30 the asterisk is the times sign because x is used as a variable so often. . Ed
 Probability-and-statistics/454517: Speed trap on the highway set by the O.P.P. shows that the mean speed of cars is 103.4 km/h with a standard deviation of 9.8 km/h. The posted speed limit on the highway is 100 km/h. Police officers tend not to pull over drivers between 100 km/h and 110 km/h. What percentage of drivers is this?1 solutions Answer 312108 by edjones(7569)   on 2011-05-26 19:25:49 (Show Source): You can put this solution on YOUR website!z(below M)=(100-103.4)/9.8= -0.3469 z(above M)=(110-103.4)/9.8= 0.6735 . Area under curve -0.3469 to 0 = 0.1357 Area under curve 0 to 0.6735 = 0.2497 0.1357+0.2497=.3854=38.54% . Ed
 Probability-and-statistics/454518: Speed trap on the highway set by the O.P.P. shows that the mean speed of cars is 103.4 km/h with a standard deviation of 9.8 km/h. The posted speed limit on the highway is 100 km/h. The top 2% of all drivers speeding are subject to losing their license. According to the data, what speed must a driver be traveling to lose his or her license?1 solutions Answer 312101 by edjones(7569)   on 2011-05-26 19:08:28 (Show Source): You can put this solution on YOUR website!A one tailed distribution with the area under alpha of .02 has a z of 2.05 9.8*2.05=20.1 (rounded) 103.4+20.1=123.5 km/h Speed the driver must be traveling to lose his license. . Ed
 Probability-and-statistics/454537: On any given day the probability that a certain gas station will run out of gas is 1/10. What is the probability the gas station will run out of gas at least two days in the next two weeks? What is the expected number of times the gas station will run out of gas in the next 2 weeks?1 solutions Answer 312094 by edjones(7569)   on 2011-05-26 18:38:37 (Show Source): You can put this solution on YOUR website!p=.1, q=.9 q^14+.14q^13p=.5846 probability it wont run out more than once 1-.5846=.4154 the probability the gas station will run out of gas at least two days in the next two weeks. . 14*.1=1.4 the expected number of times the gas station will run out of gas in the next 2 weeks. . Ed
 Permutations/453776: at the conclusion of a soccer game whose two teams each include 11 players, each player on the winning team "gave five" to (slapped hands) each player on the losing team. each player on the winning team also gave five to each other player on the winning team. how many fives were given?1 solutions Answer 311723 by edjones(7569)   on 2011-05-24 22:25:29 (Show Source): You can put this solution on YOUR website!11^2=121 winners to losers 10+9+8+...1=55 winners to winners. 121+55=176 . Ed
 Permutations/453778: A group has 6 men amd 5 women. How many ways can a committee of 3 men and 2 women be formed?1 solutions Answer 311721 by edjones(7569)   on 2011-05-24 22:16:18 (Show Source): You can put this solution on YOUR website!nCr=combination of n things taken r at a time=n!/((n-r)!*r!) 6C3 * 5C2 =20*10 =200 ways . Ed
 Percentage-and-ratio-word-problems/453781: (((Kobe made 9 out of every 12 shots. what percent of shots did Kobe make?)))I NEED HELP! Thanks! 1 solutions Answer 311719 by edjones(7569)   on 2011-05-24 22:08:40 (Show Source): You can put this solution on YOUR website!9/12=3/4=.75=75%
 Permutations/453783: Four cards are drawn from a standard deck of 52 cards without replacement. Find the probability that the first card is a heart, the second is a club, and the third and fourth are diamonds. 1 solutions Answer 311718 by edjones(7569)   on 2011-05-24 22:07:35 (Show Source): You can put this solution on YOUR website!13/52 * 13/51 * 13/50 * 12/49 =26364/6497400 =.0041 . Ed