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# Recent problems solved by 'edjones'

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 test/362931: in a right triangle, find the length of the side not given, b=2,c=sqrt of 131 solutions Answer 258696 by edjones(7569)   on 2010-10-27 23:22:31 (Show Source): You can put this solution on YOUR website!a^2+b^2=c^2 a^2+4=13 a^2=9 a=3 . Ed
 Equations/362934: 3i(2+5i)=x+6i1 solutions Answer 258695 by edjones(7569)   on 2010-10-27 23:19:03 (Show Source): You can put this solution on YOUR website!3i(2+5i)=x+6i -15+6i=x+6i x=-15 . Ed
 Mixture_Word_Problems/362936: Can someone show me a table for the following equation? a spice mixture is 25% thyme. How many grams of thyme must be added to 12 g of the mixutre to increase the thyme content to 40%?1 solutions Answer 258691 by edjones(7569)   on 2010-10-27 23:13:56 (Show Source): You can put this solution on YOUR website!12<==>.25<==>3 x<===>1.0<==>x 12+x<=>.4<=>.4(12+x) . Ed
 Probability-and-statistics/362939: Hello, Can someone please check my answer. Thank you. Essay; show all work. A community 5K run will award \$50 to the winner. 80 people enter the race, and they each pay an entry fee of \$20. Assuming they are all equally likely to win, what is a fair price for the competition? Round to the nearest cent. E = 50 E = 50-20 = 30 Fair price for the competition To make the game "fair", the community should only charge \$2.67 to play the game. 1 solutions Answer 258683 by edjones(7569)   on 2010-10-27 22:46:16 (Show Source): You can put this solution on YOUR website!80x=50 x=50/80=\$.63 fair price for the competition. . Ed
 Permutations/362680: From a group of ten people, can you form more committees of 2 or more different commitees of eight? This is a puzzler for my math class and I am aproaching if from the veiw that there are more different commitees of eight rather than 2. Because one can be in more committtes if there is eght people. Am I even on th eright track?1 solutions Answer 258562 by edjones(7569)   on 2010-10-27 19:23:59 (Show Source): You can put this solution on YOUR website!Do the math! This is a combination problem because arrangement is not important. 10C2=45 10C8=45 You can form the same number of committees. . Ed
 Volume/362724: I have a square with a cirlce inside the square the square sides are 32cm the cirlce inside has a radius of 16cm what is the area of the square outside the circle (the four corners outside the circle) yet still inside the square1 solutions Answer 258548 by edjones(7569)   on 2010-10-27 19:12:14 (Show Source): You can put this solution on YOUR website!32^2=1024 cm^2 pi*16^2=804.25 cm^2 1024-804.25=219.75 cm^2 . Ed
 Graphs/362729: 4x- 1/2 = 81 solutions Answer 258545 by edjones(7569)   on 2010-10-27 19:06:08 (Show Source): You can put this solution on YOUR website!4x- 1/2 = 8 8x-1=16 8x=17 x=17/8 . Ed
 Numeric_Fractions/362752: rewrite 2/5 and 1/3 with common denominator1 solutions Answer 258542 by edjones(7569)   on 2010-10-27 19:03:07 (Show Source): You can put this solution on YOUR website!6/15 and 5/15
 Numeric_Fractions/362757: rewrite 5/16and 3/8 fractions with common denominator1 solutions Answer 258540 by edjones(7569)   on 2010-10-27 19:01:32 (Show Source): You can put this solution on YOUR website!5/16and 3/8 5/16 and 6/16
 Word_Problems_With_Coins/362761: Please help me solve this problem:sabrina has ten nickels, five quarters and three pennies. How much money does she have?1 solutions Answer 258539 by edjones(7569)   on 2010-10-27 18:59:41 (Show Source): You can put this solution on YOUR website!\$1.78
 Rational-functions/362384: f(x)=|x+2| x y 7 5 2 0 -2 -5 -101 solutions Answer 258259 by edjones(7569)   on 2010-10-27 00:39:25 (Show Source): You can put this solution on YOUR website!f(x)=|x+2| x y 7 9 5 7 2 4 0 2 -2 0 -5 3 -10 8 . Ed
 Probability-and-statistics/362306: Elected Board of Directors. There are 12 members on the board of director for the Newport General Hospital. (a) If they must elect a chairperson, first vice chairperson, second vice chairperson and secretary, how many different slates of candidates are possible? (b) If they must form an ethics subcommittee of four members, how many different subcommittees are possible? 1 solutions Answer 258178 by edjones(7569)   on 2010-10-26 21:03:29 (Show Source): You can put this solution on YOUR website!Order is important. nPr: Permutation of n things r at a time. = n!/(n-r)! 12P4=11,880 different subcommittees are possible. . Ed
 Problems-with-consecutive-odd-even-integers/362296: Could you help me figure out the equation that could be used to find two consecutive even integers whose sum is 90. 1 solutions Answer 258175 by edjones(7569)   on 2010-10-26 20:57:38 (Show Source): You can put this solution on YOUR website!x+x+2=90
 Polynomials-and-rational-expressions/362219: Please evaluate the given polynomial: ; 1 solutions Answer 258172 by edjones(7569)   on 2010-10-26 20:54:59 (Show Source): You can put this solution on YOUR website! If x=-i/2 then x=i/2 also. -i/2 * i/2 = 1/4 (x^4 + x - 1)/(1/4) =4(x^4+x-1) . Ed
 expressions/362224: The problem in the book is 16 + T < 42 and the object is to figure out the value of T...however, I am not coming up with an answer less than 42. Please help :)1 solutions Answer 258163 by edjones(7569)   on 2010-10-26 20:38:38 (Show Source): You can put this solution on YOUR website!16+t<42 t<26 subtract 16 from each side. . Ed
 Rational-functions/362233: Simplify -10/21 divided by 15/281 solutions Answer 258160 by edjones(7569)   on 2010-10-26 20:35:14 (Show Source): You can put this solution on YOUR website!-10/21 / 15/28 =-10/21 * 28/15 =-2/3 * 4/3 =-8/9 . Ed
 Linear_Algebra/362239: How do you find the X intercept?1 solutions Answer 258155 by edjones(7569)   on 2010-10-26 20:30:47 (Show Source): You can put this solution on YOUR website!Find out what x is equal to when y = 0. Ed
 Money_Word_Problems/362253: Are the inequalities x > -8 and –x < 8 equivalent? o Why or why not? Prove your answer. 1 solutions Answer 258153 by edjones(7569)   on 2010-10-26 20:28:17 (Show Source): You can put this solution on YOUR website! x > -8 and –x < 8 -x<8 x>8 divide each side by -1 and reverse the inequality sign. . Ed
 Square-cubic-other-roots/362262: How does the square root of X = X? I can't figure this one out1 solutions Answer 258151 by edjones(7569)   on 2010-10-26 20:23:59 (Show Source): You can put this solution on YOUR website!x=1, x=0
 Equations/362269: well, im doin a project about two stepp equations and i can't seem to find a problem with the answer of 12, can u give me a problem that i can answer and the answer will be 12?1 solutions Answer 258150 by edjones(7569)   on 2010-10-26 20:22:05 (Show Source): You can put this solution on YOUR website!x+4=16
 Quadratic_Equations/362030: Good Afternoon, Sam here. I am having a terrible time trying to solve this story or word problem. The trouble I am having is getting the exact answer as the book shows. Could someone who is an expert is this area please show me, by covering all steps how I would attack this type of problem. Section 11.5, #9 Directions: Solve The total function p(x) for a company producing x thousand units is given by P(x)=-〖2x〗^2+28x-80 (it should be -2x squared) Find the values of x for which the company makes a profit. [Hint: company makes a profit when P(x)>0]. the answer my textbook provides is: x is between 4 thousand units and 10,000 units. I have no idea how to even get started, or what steps I should use to get the correct answer. Your help is greatly appreciated. 1 solutions Answer 258065 by edjones(7569)   on 2010-10-26 15:44:58 (Show Source): You can put this solution on YOUR website!P(x)=-2^2+28x-80 -2^2+28x-80=0 x=3 when x>3 then P(x) is positive to infinity. Did you copy the equation correctly? . Ed
 Polynomials-and-rational-expressions/362032: I need help on factoring polynomials math is my weakest subject and I need a lot of help on it. Here are some examples of problems I need help on: 1. 12m^5n^2+9m^4n+6m^3n^2 2. 6x^2+3x-15 3. 6x^4-10x^3+3x^2 and I would really appreciate if I can have the steps on how to solve these and problems like these because I'm not really understanding how the book is explaining it. Thank you. 1 solutions Answer 258058 by edjones(7569)   on 2010-10-26 15:15:31 (Show Source): You can put this solution on YOUR website!6x^2+3x-15 =3(2x^2+x-5)
 Probability-and-statistics/362036: 2.100 ) The probability that a one-car accident is due to faulty brakes is 0.04 , the probability that a one-car accident is correctly attributed to faulty brakes is 0.82 , and the probability that a one-car accident is incorrectly attributed to faulty brakes is 0.03 . What is the probability that : a) A one-car accident will be attributed to faulty brakes; b) A one-car accident attributed to faulty brakes was actually due to faulty brakes . 1 solutions Answer 258057 by edjones(7569)   on 2010-10-26 15:08:37 (Show Source): You can put this solution on YOUR website!a) .04*.82=.0328 .0328 + 0.03 = .0628 Probability a one-car accident will be attributed to faulty brakes. . b) .04*.82=.0328 . Ed
 Probability-and-statistics/362042: A student is taking a multiple choice exam with 16 questions. Each question has five alternatives. If the student guesses on 12 of the questions what is the probability she will guess at least 8 correct?1 solutions Answer 258056 by edjones(7569)   on 2010-10-26 14:58:45 (Show Source): You can put this solution on YOUR website!x=.8 and y=.2 Partly expand (x+y)^12 x^12+12x^11y+66x^10y^2220x^9y^3 =.7946 Probability 9 or more will be wrong. 1-.7946 =.2054 probability she will guess at least 8 correct. . Ed
 Probability-and-statistics/361911: a sample poll of 1000 voters reveal the following information about candidate A, B and C who are nominated for three different offices. 200 are in favor of candidate A, 500 are in favor of candidate B, 500 are in favor of candidate C, 100 in favor of both A and B,100 in favor of both A and C, 250 in favor of both candidate B and C, 100 in favor of all three candidates. Donate by A, B and C the event that the selected product favors candidates A, B and C respectively. Required: Are the three events statistically independent, explain.1 solutions Answer 258048 by edjones(7569)   on 2010-10-26 14:41:25 (Show Source): You can put this solution on YOUR website!They are all statistically independent. P(A|B)=.1/.5=.2=P(A) P(B|C)=.25/.50=.5=P(B) P(C|A)=.1/.2=.5=P(C) etc . Ed
 Quadratic_Equations/361941: Solve 4x^3+x^2-36x-9=0 Answers A) 3,(1/4) B) -9,9,-(1/4) C) -3,3,-4 D) -3,3,-(1/4) ps the ^ means to the power of....thanks soo much 1 solutions Answer 258034 by edjones(7569)   on 2010-10-26 13:44:03 (Show Source): You can put this solution on YOUR website!4x^3+x^2-36x-9=0 x^2(4x+1)-9(4x+1)=0 Factoring by grouping. (x^2-9)(4x+1)=0 (x+3)(x-3)(4x+1)=0 x=3, x=-3, x=-1/4 . Ed
 Polynomials-and-rational-expressions/361955: I'm still trying to finish this packet I have... So here's another few questions I'm having a hard time with. I really appreciate the help, and I reallyyy need it! 1. r to the third + r^ - 6r 2. x^ - 14x + 49 x^ + 1 over 2x + 1 over 16 (as fractions) 3. 81m to the fourth - 16 4. 4- 2q - 6p + 3pq 5. 3n to the third + 12n^ - 36n 6. r^ + r + 3 7. 16x^ - 14x + 3 8. 7b^ - 42b + 56 9. y^ + 4y - 45 10. 8a^ + 23a - 3 Thank you againnn! I just really need to get this class out of my way. It's holding me back from continuing other work and classes that I don't even struggle with. I'm sure you can imagaine my frustration with this! But thank you for the help...1 solutions Answer 258030 by edjones(7569)   on 2010-10-26 13:35:45 (Show Source): You can put this solution on YOUR website!81m^4-16 =(9m^2+4)(3m+2)(3m-2) . Ed
 Probability-and-statistics/361958: If two events A and B are independent and you know that P(A) = 0.45, what is the value of P(A | B)? P(A|B) =1 solutions Answer 258028 by edjones(7569)   on 2010-10-26 13:32:54 (Show Source): You can put this solution on YOUR website!P(A|B) = .45
 Polynomials-and-rational-expressions/361963: Another few I need a quick hand with to get it done. It's due tomro and I'm pressured for time but I need to finish and pass my test! Please continue helping me! It's greatly appreciateddd! These are still factoring polynomials 1. 4k^ - 25 2. -16^ - 48x - 36 These ones say to solve each equation. I think these might be easier but I'd like to see your work to show me and make sure I'm doing it right. Thank youuu! 3. (y + 9)(2y - 3) = 0 4. m^ + 2m - 15 = 0 5. 8r^ = 24r 6. b2 - 49 = 0 7.(3c + 16) = 0 8. z to the fourth + 8z to the third - 9z^ = 0 9. (y-7)(2y^ + 7y - 15) = 01 solutions Answer 258027 by edjones(7569)   on 2010-10-26 13:29:53 (Show Source): You can put this solution on YOUR website!b2 - 49 = 0 (b-7)(b+7)=0 b=7, b=-7 . Ed
 Probability-and-statistics/361985: In a class of 28, 4 out of 16 girls and 7 out of 12 boys wear contact lenses. A student is chosen randomly from the class. (a) What is the probability that the chosen student is not wearing contact lenses? (b) What is the probability that the chosen student is a girl or someone who does not wear contact lenses? (c) If the chosen student is wearing contact lenses, what is the probability that the chosen student is a boy? (d) If G represents the event that the chosen student is a girl and C represents the event that the chosen student wears contact lenses, determine whether events G and C are independent. 1 solutions Answer 258024 by edjones(7569)   on 2010-10-26 13:21:56 (Show Source): You can put this solution on YOUR website!Make a table with Boys and Girls at the top and CLs and No CLs on the side and fill in the 4 boxes with the appropriate numbers for questions a) thru c). a) 17/28 . b) 21/28 . c) 7/11 . d) Event G and C are not independent because P(G|C)(.37) in not equal to P(G)(.59). . Ed
 Probability-and-statistics/361724: Billy has 5 coins, 1 penny, 1 nickel, 1 dime, 1 quarter, and 1 half-dollar. How many different sums of money can Billy form by using 1, 2, or 3 of these coins?1 solutions Answer 257935 by edjones(7569)   on 2010-10-26 01:53:07 (Show Source): You can put this solution on YOUR website!1) 5 . 2) 5C1*4C1=20 . 3) 5C1*4C2*3C1=60 . Ed