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# Recent problems solved by 'edjones'

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 Probability-and-statistics/281113: You throw a bean bag at a wall with 9 colored squares, each with an area of 1/9 ft^2. If you hit a square, you win a prize. The area of the wall is 45 ft^2. What is the probability that you will win a prize ? Answer in units of %.1 solutions Answer 204223 by edjones(7569)   on 2010-03-15 15:55:55 (Show Source): You can put this solution on YOUR website!1/9 * 9 = 1 1/45 probability = .02222 = 2.22% . Ed
 Probability-and-statistics/281115: suppose you have 225 square tiles, all the same size. you can tile one surface using all the tiles. how could you tile more than one square surface using all the tiles no surface can have only one tile1 solutions Answer 204222 by edjones(7569)   on 2010-03-15 15:51:18 (Show Source): You can put this solution on YOUR website!Factor 225 = 3*3*5*5 The 2 squares you can tile are one with a side length of 3 tiles and the other with a side length of 5 tiles. . Ed
 Probability-and-statistics/281121: Find the probability of answering the two multiple choice questions correctly if random guesses are made. Assume the questions each have five choices for the answer. Only one of the choices is correct.1 solutions Answer 204221 by edjones(7569)   on 2010-03-15 15:45:53 (Show Source): You can put this solution on YOUR website!1/5 * 1/5 = 1/25
 Proportions/281125: If you bought 100feet of fence for 35 dollars, how much does 32feet cost?1 solutions Answer 204220 by edjones(7569)   on 2010-03-15 15:43:19 (Show Source): You can put this solution on YOUR website!x/32 = 35/100 x=(32*35)/100 x=\$11.20 . Ed
 Quadratic_Equations/278889: I have to complete the square: r^2+8r+72=01 solutions Answer 202884 by edjones(7569)   on 2010-03-09 17:04:58 (Show Source): You can put this solution on YOUR website!r^2+8r+72=0 r^2+8r =-72 r^2+8r+16=-56 [(8/2)^2=16 completes the square. add it to each side. r+4=+-sqrt(-56) square root of each side. r+4=+-2sqrt(14)i r=-4+2sqrt(14)i, r=-4-2sqrt(14)i . Ed
 Miscellaneous_Word_Problems/278921: Am ad claims that in a recent poll, three out of four dentists recommend brushing with a certain toothpaste. If there were 92 dentists polled, how many favored this brand?1 solutions Answer 202878 by edjones(7569)   on 2010-03-09 16:53:39 (Show Source): You can put this solution on YOUR website!92 * 3/4 = 276/4 = 69 favored this brand.
 Exponential-and-logarithmic-functions/278911: compute.choose the expresion that is equal to the given expression. (4x10^4)(7x10^-6) a)28x10^10 b)2.8x10^-1 c)2.8x10^-2 d)28x10^-241 solutions Answer 202873 by edjones(7569)   on 2010-03-09 16:38:30 (Show Source): You can put this solution on YOUR website!(4x10^4)(7x10^-6) =28*10^-2 =2.8*10^-1 . Ed
 Triangles/278916: What is the perimeter of a rigle triangle where A=6x and B=8x?1 solutions Answer 202867 by edjones(7569)   on 2010-03-09 16:12:22 (Show Source): You can put this solution on YOUR website!a=6x, b=8x a^2+b^2=c^2 36x^2+64x^2=c^2 100x^2=c^2 c=10x P=24x . Ed
 Probability-and-statistics/278693: What is the probability that you will not have to wait more than 4 minutes for a train that runs every 10 minutes?1 solutions Answer 202757 by edjones(7569)   on 2010-03-08 22:46:01 (Show Source): You can put this solution on YOUR website!(10-4)/10=6/10=3/5
 Probability-and-statistics/278589: Ten pair of shoes are kept in a rack.If four shoes are selected at random what is the probability that there is atleast one pair among them1 solutions Answer 202755 by edjones(7569)   on 2010-03-08 22:32:28 (Show Source): You can put this solution on YOUR website!After the 1st shoe removed 1/19 that its brother will be chosen. after a second removed then 2/18 chance and after 3rd chosen 3/17. 1/19 + 2/18 + 3/17 = .34 I am not 100% sure that this correct. Let me know. . Ed
 Angles/278604: the measure of an angle s one-forth the measure of its supplement .find the measure of the angle1 solutions Answer 202724 by edjones(7569)   on 2010-03-08 21:12:21 (Show Source): You can put this solution on YOUR website!s=(180-s)/4 4s=180-s 5s=180 s=36 degrees . Ed
 Permutations/278601: in a shipment of 11 CD players, two are defective. Find the probability that a sample of 2 CD players will not contain any that are defective.1 solutions Answer 202722 by edjones(7569)   on 2010-03-08 21:09:24 (Show Source): You can put this solution on YOUR website!2/11 probability a player will be defective let a=2/11, b=9/11 (a+b)^2=a^2+2ab+b^2 probability none defective = b^2 = (9/11)^2 = 81/121 = .6694 . Ed
 Probability-and-statistics/278603: A bag contains 2 white, 4 green, 6 red, 8 blue, and 10 black marbles. if the marbles are drawn at random and not replaced, find the probability of the following, order is not important and marbles are replaced at the end of each problem p(1 red,1 white,1 blue) (8:26:35 PM): p(2green) (8:26:38 PM): p(3red) (8:26:50 PM): p(2green, 2black)1 solutions Answer 202720 by edjones(7569)   on 2010-03-08 21:00:11 (Show Source): You can put this solution on YOUR website!2+4+6+8+10=30=n nCr Combination of n things taken r at a time. . p(1 red,1 white,1 blue) P=(6C1 * 2C1 * 8C1)/30C3 =24/1015=.0236 . The rest are done in the same manner. . Ed
 Linear-equations/278609: Determine whether graphs are perpendicular: 9x-8y=7 9y-8x=4 Are they perpendicular1 solutions Answer 202716 by edjones(7569)   on 2010-03-08 20:43:59 (Show Source): You can put this solution on YOUR website!9x-8y=7 9y-8x=4 . 9x-8y=7 -8y=-9x+7 y=9x/8 - 7/8 . 9y-8x=4 9y=8x+4 y=8x/9 + 4/9 . No, because in order to be perpendicular m (slope) has to be the negative reciprocal of the slope of the other equation in the slope intercept form and these are not. . Ed .
 Human-and-algebraic-language/277930: If two inlet pipes are both open, they can fill a pool in 3 hours and 36 minutes. One of the pipes can fill the pool by itself in 6 hours. How long, in hours, would it take the other pipe to fill the pool by itself?1 solutions Answer 202343 by edjones(7569)   on 2010-03-07 10:12:10 (Show Source): You can put this solution on YOUR website!3 h 36 m = 3.6h In one hr both pipes do 1/3.6 of the job. in 1 hr the 1st pipe does 1/6 of the job. 1/6 + x = 1/3.6 x=1/3.6 - 1/6 =10/36 - 6/36 = 4/36 = 1/9 of the job done by the 2nd pipe in 1 hr. 9 hrs time it takes the 2nd pipe to fill the pool. . Ed
 Permutations/277993: An exam contains 5 multiple-choice questions, each having 4 possible answers. In how many different ways can the exam be completed? Answer C(5, 4) 5 square 4 4 square 5 5-4-3-2 1 solutions Answer 202342 by edjones(7569)   on 2010-03-07 09:40:27 (Show Source): You can put this solution on YOUR website!4^5
 Polynomials-and-rational-expressions/277997: Solve using the five-step problem-solving process. Show all neccessary steps to arrive at your solution. Round your answer to 2 decimal places. A cylindrical drum has a diameter of 3 yards and a volume of 65 cubic yards. What is the height of the drum? (Hint: Use V = ∏r^2h) I have no idea where to start.Please help me.1 solutions Answer 202341 by edjones(7569)   on 2010-03-07 09:34:54 (Show Source): You can put this solution on YOUR website!pi*r^2h=V pi*1.5^2*h=65 pi*2.25*h=65 h=65/(pi*2.25) h=65/7.07 h=9.19 yds . Ed
 Permutations/278002: how many sequences are possible for the last four digits of a social security number and the calculation for it?1 solutions Answer 202340 by edjones(7569)   on 2010-03-07 09:26:09 (Show Source): You can put this solution on YOUR website!10^4=10,000