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# Recent problems solved by 'edjones'

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 Probability-and-statistics/614354: Poker is a common game in which players are dealt five cards from a deck of cards. It can be shown that there are 2,598,960 different possible poker hands. The winning hands (from highest to lowest) are shown in the table below. Find the requested probabilities. (Use a calculator and give the answer to five decimal places.) Royal Flush is 4 hands Other straight flush is 36 hands Four of a kind is 624 hands Full house is 3,744 hands Flush is 5,108 hands Straight is 10,200 hands Three of a kind is 54,912 hands Two pair is 123,552 hands One pair is 1,098,240 hands Other hands is 1,302,540 hands (1) What are the chances of being dealt a full house or better? (2) What are the chances of being dealt a hand that will lose to a flush? 1 solutions Answer 386511 by edjones(7569)   on 2012-05-23 23:52:24 (Show Source): You can put this solution on YOUR website!1) (4+36+624+3744)/2598960 =.00170 . 2) (1302540+1098240+123552+54912+10200)/2598960 =.99634 . Ed
 Rational-functions/614341: How do I solve: 7/(2-x) = (10-4x)/(x^2 + 3x - 10)1 solutions Answer 386509 by edjones(7569)   on 2012-05-23 23:40:18 (Show Source): You can put this solution on YOUR website!7/(2-x) = (10-4x)/(x^2 + 3x - 10) 7(x^2+3x-10)=(10-4x)(2-x) 7x^2+21x-70=4x^2-18x+20 3x^2+39x-90=0 x^2+13x-30=0 (x-2)(x+15)=0 x=-15 The only answer. . Ed
 real-numbers/614012: write three irrational number between 5/7 and 9/111 solutions Answer 386367 by edjones(7569)   on 2012-05-23 08:34:26 (Show Source): You can put this solution on YOUR website!All square roots whose result is not an integer are irrational numbers. sqrt(.6) sqrt(.61) sqrt(.601) . Ed
 absolute-value/614026: If someone would please explain this question to me. I use this symbol ( / )for the absolute value. /3-4/-/5-7/+/-2+6/=1 solutions Answer 386366 by edjones(7569)   on 2012-05-23 08:29:33 (Show Source): You can put this solution on YOUR website!Use the "|" sign which comes on when the Shift key is depressed and the backward slash "\" key is pressed at the same time. |3-4|-|5-7|+|-2+6| =|-1|-|-2|+|4| =1-2+4 =3 . Ed
 real-numbers/614020: three irrational numbers between 5/7and 9/111 solutions Answer 386358 by edjones(7569)   on 2012-05-23 08:14:22 (Show Source): You can put this solution on YOUR website!sqrt(.6) sqrt(.61) sqrt(.601)
 Word_Problems_With_Coins/614019: Diane has \$1.15 in dimes and nickels. She has a total of 13 coins. How many of each kind does she have?1 solutions Answer 386356 by edjones(7569)   on 2012-05-23 08:05:04 (Show Source): You can put this solution on YOUR website!Let d=number of dimes and n=number of nickels. d+n=13 .1d+.05n=1.15 . d=13-n .1(13-n)+.05n=1.15 1.3-.1n+.05n=1.15 -.05n=-.15 n=3 d=10 . Ed
 Permutations/613523: 4 cards are drawn from an ordinary deck. In how many ways is it possible to draw 3 cards of the same suit?1 solutions Answer 386069 by edjones(7569)   on 2012-05-22 00:06:30 (Show Source): You can put this solution on YOUR website!(13C3)(39C1)*4=44,616 Three out of 13 cards of any suit * one out of the remaining 39 cards * four possible suits. . Ed
 Probability-and-statistics/613559: Please kind person, I need your help. Can you please assist me with this question? I am going mad trying to answer this. Perform the operation 5-7 using arithmetic for a 12-hour clock. Select the correct answer. (a)5-7= 10 (b)5-7= 12 (c)5-7= 11 1 solutions Answer 386068 by edjones(7569)   on 2012-05-21 23:47:32 (Show Source): You can put this solution on YOUR website!Start at 5 and go back 7 hrs to get 10 (a).
 percentage/613525: what is the percent of increase from 45 to 701 solutions Answer 386067 by edjones(7569)   on 2012-05-21 23:43:45 (Show Source): You can put this solution on YOUR website!70/45=1.55555556 1-1.55555556=0.555556 =55.56% percent of increase . Ed
 Unit_Conversion_Word_Problems/613529: a wheel makes a rotation of 2 3/20 per minute how many rotations will it make in 44 minutes1 solutions Answer 386064 by edjones(7569)   on 2012-05-21 23:38:00 (Show Source): You can put this solution on YOUR website!2 3/20 = 43/20 44 * 43/20 =2.2*43 =94.6 revolutions . Ed
 Volume/613534: A cylinder has a volume of 1575π and a height of 7. What is the radius of its base?1 solutions Answer 386063 by edjones(7569)   on 2012-05-21 23:33:19 (Show Source): You can put this solution on YOUR website!pi*r^2=1575*pi r^2=1575 r=sqrt(225*7) =15sqrt(7) . Ed
 Linear-equations/613536: Solve the problem by elimination -6x-6y= -12 -6x+7y= 141 solutions Answer 386061 by edjones(7569)   on 2012-05-21 23:27:24 (Show Source): You can put this solution on YOUR website!-6x-6y= -12 -6x+7y= 14 --------------Subtract -13y=-26 . y=2 x=0 . Ed
 Probability-and-statistics/612758: A picture must be taken of the golf team:a coach,a manager,& 5 athletes. If the team must be lined up coach first & manager last, how many different ways can the team be ordered?? Help will be appreciated!1 solutions Answer 385721 by edjones(7569)   on 2012-05-20 02:41:50 (Show Source): You can put this solution on YOUR website!5! ways.
 Triangles/612590: If one side of a triangle is 1/3 the perimeter, second is 7cm and third is 1/5 the perimeter, what is the perimeter of the triangle? 1 solutions Answer 385610 by edjones(7569)   on 2012-05-18 22:35:37 (Show Source): You can put this solution on YOUR website!p=perimeter p/3 + 7 + p/5 = p 5p+105+3p=15p Multiply each side by 15. 7p=105 p=15 cm . Ed
 Average/609649: Kaleb keeps a record of his algebra quiz scores but forgot to record 1 score. He knows the mean of his 7 quiz scores is 84% and that the quiz scores he recorded are 85%, 79%,92%,81%,82%, and 79%. What Is Kaleb's missing quiz score?.1 solutions Answer 383855 by edjones(7569)   on 2012-05-10 16:55:42 (Show Source): You can put this solution on YOUR website!.85+.79+.92+.81+.82+.79+x=.84*7 4.98+x=5.88 x=.90 or 90% . Ed
 Word_Problems_With_Coins/609642: John bought 75 stamps for 19.94. Some were 20 cent stamps and some were 33 cent stamps. How many of each kind did he buy?1 solutions Answer 383853 by edjones(7569)   on 2012-05-10 16:49:43 (Show Source): You can put this solution on YOUR website!Let x be the number of 20 cent stamps bought. .20x+.33(75-x)=19.94 .2x+24.75-.33x=19.94 -.13x+24.75=19.94 -.13x=-4.81 x=37 75-37=38 (33 cent stamps) . Ed
 test/609616: A=H/B WHICH OF THE FOLLOWING COULD BE USED TO DETERMINE THE NUMBER OF HITS A PLAYER HAS DURING THE SEASON ? A.H=AB B.H=A+B C.H=A/B D.H=B/A1 solutions Answer 383847 by edjones(7569)   on 2012-05-10 16:39:38 (Show Source): You can put this solution on YOUR website!A. H=AB
 test/609633: y to the second power -15y+261 solutions Answer 383846 by edjones(7569)   on 2012-05-10 16:35:17 (Show Source): You can put this solution on YOUR website!y^2-15y+26 =(y-13)(y-2)
 Proportions/609641: lester can type 48 words per minute.at that rate, how many words can he type in 90 seconds 1 solutions Answer 383844 by edjones(7569)   on 2012-05-10 16:32:39 (Show Source): You can put this solution on YOUR website!x/90=48/60 x=4320/60 =72 words . Ed
 logarithm/609621: ln(x+1)-ln(x)=31 solutions Answer 383840 by edjones(7569)   on 2012-05-10 16:30:04 (Show Source): You can put this solution on YOUR website!ln(x+1)-ln(x)=3 e^ln(x+1)/e^ln(x)=e^3 (x+1)/x = e^3 x+1=xe^3 xe^3-x=1 x(e^3-1)=1 x=1/(x^3-1) . Ed
 Travel_Word_Problems/609620: Please help me solve this, I don't understand A sales executive traveled 72 miles by car and then an additional 840 miles by plane. The rate of the plane was five times faster than the rate of the car. The total time of the trip was 5 hours. find the rate of the plane what I tried was setting it up like this 72/x +840/5x=912 I put 912 because I just added the miles given, please help1 solutions Answer 383835 by edjones(7569)   on 2012-05-10 16:17:52 (Show Source): You can put this solution on YOUR website!r=rate of car, 5r=rate of plane t=d/r 72/r + 840/5r = 5 360+840=25r multiply each side by 5r. 25r=1200 r=48 mph 5r=240 mph . Ed
 Travel_Word_Problems/609610: A plane flying from city A to city B at 300 mi/hr arrives 30 minutes later than it was scheduled. If the plane had flown at 350 mi/hr, it would have made it on time as it was scheduled. What is the distance between the two cities A and B?1 solutions Answer 383825 by edjones(7569)   on 2012-05-10 15:50:02 (Show Source): You can put this solution on YOUR website!t=d/s t + 1/2 = d/300 t = d/300 - 1/2 . t = d/350 . d/300 - 1/2 = d/350 14d-2100=12d Multiply each side by 4200 2d=2100 d=1050 mi . Ed
 Probability-and-statistics/609522: a box contains 7 white golf balls and 1 orange golf ball. what is the probability that a person will reach in without looking and get 2 white balls?1 solutions Answer 383822 by edjones(7569)   on 2012-05-10 15:32:31 (Show Source): You can put this solution on YOUR website!7/8 * 6/7 = 42/56 = 3/4 . Ed
 Radicals/609530: Simplify the following expression. square root -7 square root -1051 solutions Answer 383817 by edjones(7569)   on 2012-05-10 15:25:12 (Show Source): You can put this solution on YOUR website!sqrt(-7)*sqrt(-105) =sqrt(735) =sqrt(49*15) =7sqrt(15) . Ed
 Probability-and-statistics/609564: Suppose in a competition 11 matches are to be played, each having one of 3 distinct outcomes as possibilities.? The number of ways one can predict the outcomes of all 11 matches such that exactly 6 of the predictions turn out to be correct is a) 11C6 * 2^5; b) 11C6; c) 3^6; d) None of the above... I think first option is correct assuming 3 outcomes but if we take two outcomes: right or wrong then option 2 also looks correct. 1 solutions Answer 383807 by edjones(7569)   on 2012-05-10 15:14:41 (Show Source): You can put this solution on YOUR website!c)3^6 ways
 Length-and-distance/609591: An umbrella 50 inch long can lie on the bottom of a trunk whose length and width are, respectively: A)26, 30 B)39,36 C)31,31 D)40,21 E)40,301 solutions Answer 383805 by edjones(7569)   on 2012-05-10 15:09:45 (Show Source): You can put this solution on YOUR website!a^2+b^2=c^2 50^2=2500 b)39^2+36^2=2817 . Ed
 Travel_Word_Problems/599758: 3 people have 1 cake to share equally. then a 4th person comes along and each person gives him a piece of their share so that 4 of them get an equal share. how much does each person give1 solutions Answer 379069 by edjones(7569)   on 2012-04-16 19:10:52 (Show Source): You can put this solution on YOUR website!Let x = the amount that each person gives. 3x=1/4 of the cake. x=1/12 of the cake. . Ed
 Probability-and-statistics/599773: An arcade has 20 different arcade games. You want to play at least 14 of them. How many different combinations of arcade games can you play?1 solutions Answer 379065 by edjones(7569)   on 2012-04-16 19:01:35 (Show Source): You can put this solution on YOUR website!Combination=nCr=n!/((n-r)!r!) =20!/((20-14)!*14!) =38760 combinations. . Ed
 Probability-and-statistics/599443: Find the probability of getting exactly three 5s if a die is rolled 5 times.1 solutions Answer 378948 by edjones(7569)   on 2012-04-16 00:09:55 (Show Source): You can put this solution on YOUR website!probability of one five is 1/6 = x y = 5/6 5C3*x^3*y^2 = 10 * 1/216 * 25/36 = 125/3888 = .0322 . Ed
 Human-and-algebraic-language/599438: bob is 8 years old and pam is 54 years old, how old will pam and bob be when pam is 3 times her age 1 solutions Answer 378947 by edjones(7569)   on 2012-04-15 23:44:31 (Show Source): You can put this solution on YOUR website!54*3=162 pam 162-54=108 108+8=116 bob
 Equations/599437: Hello :) Can you solve these three equations for me? They're for bonus/extra credits. I can't seem to figure them out :/ This is Solving substitution by elimination. ==== 12) y=-4x-10 y=-7x+12 13) y=3x+14 y=-2x+4 14) y=2x-1 2x-7y=-17 1 solutions Answer 378946 by edjones(7569)   on 2012-04-15 23:33:49 (Show Source): You can put this solution on YOUR website!12) y=-4x-10 y=-7x+12 . -7x+12=-4x-10 -3x=-22 x=22/3 y=-118/3 . Ed