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Recent problems solved by 'edjones'

edjones answered: 7568 problems
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Probability-and-statistics/743168: A bag contains 20 colored beads. A bead is selected from the bag and then replaced. After 10 draws, a red bead has been pulled out six times, a blue bead twice, and a green bead twice. Which statement about the contents of the bag must be true? A. There are twelve red beads in the bag. B. There is at least one green bead in the bag. C. There are no yellow beads in the bag. D. There are at least six red beads in the bag. E. There are four blue beads in the bag. 1 solutions Answer 452772 by edjones(7569)   on 2013-04-29 16:03:41 (Show Source): You can put this solution on YOUR website! B

test/743167: Need help with a percent problem please! If 2.4 million dollars is spent annually in CA on frozen pizza, how much more is spent on pepperoni pizzas than sausage pizzas each year? 31% pepperoni pizzas and 20% for sausage pizza 1 solutions Answer 452770 by edjones(7569)   on 2013-04-29 16:01:51 (Show Source): You can put this solution on YOUR website! 2.4*0.31=744,000 2.4*0.20=480,000 ========>264,000 more is spent on pepperoni pizzas than sausage pizzas each year . Ed

�t�e�s�t/741934: How many fifths are there in 4.8 (a) 24 (b) 0.96 (c) 1.04 (d) 9.6 (e) None of these how you solve this 1 solutions Answer 452200 by edjones(7569)   on 2013-04-25 18:44:24 (Show Source): You can put this solution on YOUR website! There are 5 fifths in each whole number. So, 4.8*5=24 . Ed

Polynomials-and-rational-expressions/741921: Please help! What is (2x-5)^2 as a perfect square trinomial? 1 solutions Answer 452198 by edjones(7569)   on 2013-04-25 18:39:16 (Show Source): You can put this solution on YOUR website! (2x-5)(2x-5)=4x^2-20x+25 . Ed

Probability-and-statistics/741924: A test includes several multiple choice questions, each with five choices. suppose you don't know the answers for three of these questions, so you guess. What is the probability of getting all three correct? 1 solutions Answer 452194 by edjones(7569)   on 2013-04-25 18:31:36 (Show Source): You can put this solution on YOUR website! (1/5)^3 = 1/125 . Ed

Equations/741928: 4x+5=3x+2 need help with steps to follow and then the answer 1 solutions Answer 452192 by edjones(7569)   on 2013-04-25 18:27:05 (Show Source): You can put this solution on YOUR website! 4x+5=3x+2 4x-3x=2-5 x=-3 . Ed

test/741929: I am in desperate need of help. 1 solutions Answer 452191 by edjones(7569)   on 2013-04-25 18:25:47 (Show Source): You can put this solution on YOUR website! Submit a problem you are having trouble with.

Quadratic_Equations/698682: How do you factor the trinomial: 3(x+2)^2+12(x+2)-15 Thank you! 1 solutions Answer 430946 by edjones(7569)   on 2013-01-05 19:59:20 (Show Source): You can put this solution on YOUR website! 3(x+2)^2+12(x+2)-15 =3(x^2+4x+4)+12x+24-15 =3x^2+12x+12+12x+9 =3x^2+24x+21 =3(x^2+8x+7) =3(x+1)(x+7) . Ed

Money_Word_Problems/698678: please help mark had $20 before he began earning the same amount each week at his new job he used half of his first week's pay to pay back a loan. he spent $15 at the movies and $12 on a book and got $25 for his birthday after his second paycheck he had$20 less than two weeks pay combined how much is his paycheck? 1 solutions Answer 430942 by edjones(7569)   on 2013-01-05 19:49:32 (Show Source): You can put this solution on YOUR website! Let x = amount of each paycheck. 20+2x - x/2 -15-12+25=2x-20 -x/2=-38 x=$76. . Ed

Polynomials-and-rational-expressions/695251: Simplify the expression (-5)^0 Please help me 1 solutions Answer 428387 by edjones(7569)   on 2012-12-17 16:23:28 (Show Source): You can put this solution on YOUR website! (-5)^0 = 1

Equations/695238: 6/35f=18/25 solve for f I got 21/5 but can't prove it please help 1 solutions Answer 428386 by edjones(7569)   on 2012-12-17 16:09:34 (Show Source): You can put this solution on YOUR website! 6/35f=18/25 35f/6=25/18 f=(25*6)/(18*35) multiply each side by 6/35 =150/630 =5/21 . Proof: 35 * 5/21 = 25/3 6 / (25/3) = 6 * 3/25 = 18/25 . Ed

Inequalities/695222: 101=13f - 2(4+3f) 1 solutions Answer 428385 by edjones(7569)   on 2012-12-17 15:54:06 (Show Source): You can put this solution on YOUR website! 101=13f-2(4+3f) ...=13f-8-6f ...=7f-8 109=7f f=109/7 . Ed

Human-and-algebraic-language/681712: if three times the square of a certain natural number is added to the number itself, the result is 14. find that number 1 solutions Answer 422771 by edjones(7569)   on 2012-11-16 18:17:39 (Show Source): You can put this solution on YOUR website! 3x^2+x=14 3x^2+x-14=0 3*-14=-42; 7*-6=-42. 3x^2-6x+7x-14=0 3x(x-2)+7(x-2)=0 (3x+7)(x-2)=0 x=2 . Ed

Exponential-and-logarithmic-functions/681374: 1 solutions Answer 422638 by edjones(7569)   on 2012-11-15 20:06:13 (Show Source): You can put this solution on YOUR website! Any number except 0 to the 0 power equals 1 =x^7*-4x^12 =-4x^19 Add exponents. . Ed

Numeric_Fractions/681364: Can you please tell me what 7 and 7/10 minus 3 and 4/5 is? 1 solutions Answer 422635 by edjones(7569)   on 2012-11-15 19:59:40 (Show Source): You can put this solution on YOUR website! 7 7/10 = 77/10 3 4/5 = 19/5 = 38/10 77/10 - 38/10 = 39/10 . Ed

Geometry_Word_Problems/681350: A rectangular lawn 90 ft by 120 is mowed, cutting uniform (equal) widths around the outside. How wide a strip has been cut when the lawn is half mowed? 1 solutions Answer 422634 by edjones(7569)   on 2012-11-15 19:55:10 (Show Source): You can put this solution on YOUR website! 90*120=10800 10800/2=5400 area when 1/2 the lawn is mowed. (90-x)(120-x)=5400 10800-210x+x^2=5400 x^2-210x+5400=0 (x-30)(x-180)=0 x=30 ft. strip has been cut when the lawn is half mowed. . Ed

Expressions-with-variables/681346: Please help me solve and check this equation: 3x-7=6x-3(x+2) . I tried solving it and got x=1, but It did not work when I plugged it back into the equation . 1 solutions Answer 422630 by edjones(7569)   on 2012-11-15 19:37:48 (Show Source): You can put this solution on YOUR website! 3x-7=6x-3(x+2) ...=6x-3x-6 3x-7=3x-6 0=1 There is no answer. . Ed

Human-and-algebraic-language/681309: Five times a number increased by 15 is 75. Find the number 1 solutions Answer 422627 by edjones(7569)   on 2012-11-15 19:26:07 (Show Source): You can put this solution on YOUR website! 5x+15=75 5x=60 x=12 . Ed

Numeric_Fractions/681330: how do I figure out this: m/4 + 6 = 3 1 solutions Answer 422614 by edjones(7569)   on 2012-11-15 18:59:42 (Show Source): You can put this solution on YOUR website! m/4 + 6 = 3 m+24=12 multiply each side by 4. m=-12 . Ed

Probability-and-statistics/677526: There are four boys and four girls at a party. In how many ways can they be seated in a row if they must sit alternating boys and girls? 1 solutions Answer 420939 by edjones(7569)   on 2012-11-08 00:18:25 (Show Source): You can put this solution on YOUR website! BGBGBGBG 4!*4!=576 GBGBGBGB 4!*4!=576 576*2=1152 ways . Ed

Quadratic_Equations/677510: -5(n-3)^2=10 1 solutions Answer 420937 by edjones(7569)   on 2012-11-08 00:07:14 (Show Source): You can put this solution on YOUR website! -5(n-3)^2=10 (n-3)^2=-2 n^2-6n+9=-2 n^2-6n+11=0 n=3-sqrt(2)i, n=3+sqt(2)i see below. . Ed . Solved by pluggable solver: SOLVE quadratic equation with variable Quadratic equation (in our case ) has the following solutons: For these solutions to exist, the discriminant should not be a negative number. First, we need to compute the discriminant : . The discriminant -8 is less than zero. That means that there are no solutions among real numbers. If you are a student of advanced school algebra and are aware about imaginary numbers, read on. In the field of imaginary numbers, the square root of -8 is + or - . The solution is Here's your graph:

test/677553: Solve the inequality and show your work. |t - (2 - t)| > 10 A. t > -4 and t < 6 B. t < 4 or t > -6 C. t > 6 or t < -4 D. None of the above. 1 solutions Answer 420933 by edjones(7569)   on 2012-11-07 23:53:11 (Show Source): You can put this solution on YOUR website! |t - (2 - t)| > 10 . t-2+t>10 2t-2>10 2t>12 t>6 . t-2+t<-10 2t-2<-10 2t<-8 t<-4 . Ed

Probability-and-statistics/677527: A club consists of 10 men and 14 women. In how many ways can they choose a president, vice president, treasurer, and secretary, along with an advisory committee of five people? 1 solutions Answer 420931 by edjones(7569)   on 2012-11-07 23:41:28 (Show Source): You can put this solution on YOUR website! 24P4 * 20C5 =255024*15504 =3,953,892,096 ways . Ed

Probability-and-statistics/677524: A certain lock has four tumblers, and each tumbler can assume six positions. How many different possibilities are there? 1 solutions Answer 420929 by edjones(7569)   on 2012-11-07 23:28:20 (Show Source): You can put this solution on YOUR website! 6^4=1296

Systems-of-equations/677531: hello I need help doing this system since I keep getting the wrong answer... thank you in advance! xy-x^2=-20 x-2y=3 1 solutions Answer 420928 by edjones(7569)   on 2012-11-07 23:23:16 (Show Source): You can put this solution on YOUR website! xy-x^2=-20 x-2y=3 . x=2y+3 y(2y+3)-(2y+3)^2=-20 2y^2+3y-(4y^2+12y+9)=... 2y^2+3y-4y^2-12y-9=... -2y^2-9y-9=-20 2y^2+9y+9=20 2y^2+9y-11=0 y=1, x=5 y=-11/2, x=-8 See below . Ed . Solved by pluggable solver: SOLVE quadratic equation with variable Quadratic equation (in our case ) has the following solutons: For these solutions to exist, the discriminant should not be a negative number. First, we need to compute the discriminant : . Discriminant d=169 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 1, -5.5. Here's your graph:

Permutations/677533: A card is selcted at random from a standard deck. Find the probabilty of randomly selecting a 9 or a face card 1 solutions Answer 420923 by edjones(7569)   on 2012-11-07 22:50:40 (Show Source): You can put this solution on YOUR website! There are 4 nines and 12 face cards. (4+12)/52 =4/13 . Ed

Probability-and-statistics/677478: Please help! i keep getting the wrong answer. i seriously dont understand Three daily newspapers are published in a large city. Suppose we have the following facts about the people in the city: 40% read Newspaper A. 36% read Newspaper C. 61% read Newspaper A or Newspaper B. 14% read Newspaper A and B. 9% read Newspaper A and C. 15% read Newspaper B and C. 3% read all three newspapers. (a) We randomly select one person in the city. The outcome of interest is which (if any) of the newspapers the person reads. How many outcomes are contained in the sample space? (b) If we randomly select a person in the city, what is the probability that she reads Newspaper A or Newspaper C? (c) If we randomly select a person in the city, what is the probability that she reads Newspaper B? (d) Without doing any calculations, what is the probability that a person reads Newspaper A if we know she reads Newspaper B? (e) What is the probability that a randomly selected person reads Newspaper C but not Newspaper B? (f) What is the probability that a randomly selected person reads Newspaper C if we know she does not read Newspaper B? (g) What is the probability that a randomly selected person reads exactly two of the three newspapers? (h) What is the probability that a person reads Newspaper A if we know she reads Newspaper C? (i) If we randomly select seven people in the city, what is the probability that exactly four of them read Newspaper A? (j) If we randomly select ten people in the city, what is the probability that at least two of them read Newspaper C? 1 solutions Answer 420922 by edjones(7569)   on 2012-11-07 22:48:20 (Show Source): You can put this solution on YOUR website! Make a 3 circle Venn diagram to understand this. 24% don't read any of the 3 newspapers. a)8 b)(.20+.11)+(.15+.12)=.58 c).09+.11+.03+.12=.35 d).14 e).15+.06=.21 f) 1.00-.35=.65 don't read B (.15+.06)/65 = 21/65 g).11+.12+.06=.29 h)(.06+.03)/.36 = 9/36 = 1/4 i) x=.4, y=.6 7C4*x^4y^3 Binomial formula for exactly 4 of 7. =35*.00553 =.1935 j) x=.36, y=.64 y^10+10y^9x Binomial formula for all don't read plus only one reads C. =.0115+.0649 =.0764 1-.0764=.9236 the probability that at least two of them read Newspaper C. . Ed

Triangles/677482: three angles if a tringle are in the ratio 2:3:5 , find the measure of each angles? 1 solutions Answer 420900 by edjones(7569)   on 2012-11-07 21:30:46 (Show Source): You can put this solution on YOUR website! 2x+3x+5x=180 10x=180 x=18 36+54+90=180 . Ed

test/677488: 2(3-x)=1-(x-2) 1 solutions Answer 420897 by edjones(7569)   on 2012-11-07 21:25:29 (Show Source): You can put this solution on YOUR website! 2(3-x)=1-(x-2) 6-2x=1-x+2 6-2x=3-x x=3 Add 2x-3 to each side. . Ed

Expressions-with-variables/677495: transform the equation E=mc2 so that it will be read as a solution for mass 1 solutions Answer 420896 by edjones(7569)   on 2012-11-07 21:20:47 (Show Source): You can put this solution on YOUR website! E=mc^2 m=E/c^2 divide each side by c^2

Probability-and-statistics/676511: A and B play for a prize to win 1000 Birr. A is to throw a die first and to win if he throws 6. If A fails, B is to throw and to win if he throws 5 or 6. If B fails, A is to throw again to win if throws 4, 5 or 6, and so on. a. Find the total probabilities of A’s success 1 solutions Answer 420408 by edjones(7569)   on 2012-11-06 09:37:42 (Show Source): You can put this solution on YOUR website! 1st throw: 1/6 probability A wins . 2nd: 1- 1/6 = 5/6 5/6 * 2/6 = 5/18 prob B wins . 3rd 1-(1/6 + 5/18)=5/9 5/9 * 3/6 = 5/18 prob A wins . 4th 1-(1/6 + 5/18 + 5/18)=5/18 5/18 * 4/6 =5/27 prob B wins . 5th 1-(1/6 + 5/18 + 5/18 + 5/27)=5/54 5/54 * 5/6 = 25/324 Prob A wins . 1-(1/6 + 5/18 + 5/18 + 5/27 + 25/324)=5/324 prob B wins. . 1/6 + 5/18 + 25/324 = 169/324 the total probabilities of A’s success. . Ed