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# Recent problems solved by 'edjones'

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 Graphs/450462: I have a question they want me to use the multiplication pronciple to solve this equation -6x<-18 I was thinking that you would divide both sides by -6 and the answer would be 3 not sure if it would be negative or positive or maybe I am going about it all wrong.1 solutions Answer 309825 by edjones(7569)   on 2011-05-16 22:39:43 (Show Source): You can put this solution on YOUR website!If you divide each side by -6 you get x>3 . Ed
 Functions/450453: The function, p(d)=1+d/33, gives the pressure, in atmospheres (atm) at a depth d in the sea ( d is in feet). Note that p(0)=1 atm, p(33)=2, and so on. find the pressure at 50 feet. 1 solutions Answer 309824 by edjones(7569)   on 2011-05-16 22:37:55 (Show Source): You can put this solution on YOUR website!p(50)= 1 + 50/33 = 33/33 + 50/33 =83/33 atm . Ed
 Expressions-with-variables/450395: How would you work out 4.4s+6.2=8.8s-1.8 1 solutions Answer 309823 by edjones(7569)   on 2011-05-16 22:30:11 (Show Source): You can put this solution on YOUR website!4.4s+6.2=8.8s-1.8 -4.4s=-8 s=1.8181... . Ed
 Probability-and-statistics/450400: For a fundraiser, a class sells 80 raffle tickets for a mall gift certificate and 120 raffle tickets for a brand new car. You buy 4 raffle tickets for the mall gift certificate and 8 raffle tickets for the new car. What is the probability that you win both pizes?1 solutions Answer 309820 by edjones(7569)   on 2011-05-16 22:25:13 (Show Source): You can put this solution on YOUR website!4/80 * 8/120 =1/300 the probability that you win both prizes. . Ed
 Probability-and-statistics/450402: Hey guys, can someone please explain this to me? Thanks in advance When Jane throws a piece of paper in the bin, the probability the piece of paper lands in the bin is 0.6. (a) What is the probability Jane misses the bin when throwing a piece of paper? (b) If she throws 2 pieces of paper in succession, what is the probability they both miss the bin? (c) If she throws 2 pieces of paper in succession, what is the probability that one lands in the bin and one misses the bin (in either order)?1 solutions Answer 309819 by edjones(7569)   on 2011-05-16 22:20:55 (Show Source): You can put this solution on YOUR website!a).4 . b).4^2=.16 . c)2(.6*.4)=.48 . Ed
 Probability-and-statistics/450447: Say you are rolling 6 standard (6 sided) dice. How would you calculate the probability of rolling one, two, three... identical elements such as rolling 5 fives? And if the question was changed so that you must meet more criteria such as rolling five 4s and a 3, how would the probability change? Thanks for the help! 1 solutions Answer 309818 by edjones(7569)   on 2011-05-16 22:14:35 (Show Source): You can put this solution on YOUR website!On consecutive rolls of one die: 1 six: 1/6 2 six: (1/6)^2=1/36 3 six: (1/6)^3=1/216 . Ed
 Probability-and-statistics/450406: what is the probability of drawing at random 2 red queens in seccession from a deck of 52 cards without replacement?1 solutions Answer 309816 by edjones(7569)   on 2011-05-16 22:07:39 (Show Source): You can put this solution on YOUR website!There are only 2 red queens in the deck. 2/52 * 1/51 =1/1326 . Ed
 Quadratic_Equations/450411: Factor by grouping. xy + 6x + 10y + 60 please show me the steps to get the answer. Thanks1 solutions Answer 309814 by edjones(7569)   on 2011-05-16 22:03:17 (Show Source): You can put this solution on YOUR website!xy + 6x + 10y + 60 =x(y+6)+10(y+6) =(x+10)(y+6) . Ed
 Quadratic-relations-and-conic-sections/450190: What is the y-coordinate of the vertex of the parabola y = -1.5(x - 2)2 + 71 solutions Answer 309717 by edjones(7569)   on 2011-05-16 17:18:48 (Show Source):
 Numbers_Word_Problems/450214: whats the multiple of 11 less than 100 with the sum of the digits between 12 and 161 solutions Answer 309716 by edjones(7569)   on 2011-05-16 17:13:40 (Show Source): You can put this solution on YOUR website!77
 Rational-functions/450195: Column A x^2 Column B x^4 If values of X are between -1 and 0, which quantity is greater?1 solutions Answer 309715 by edjones(7569)   on 2011-05-16 17:09:15 (Show Source): You can put this solution on YOUR website!(-.1)^2=.01 (-.1)^4=.0001 . Ed
 Rational-functions/450197: Column A The value of x in the equation x-5 = 3x +7 Column B the value of n in the equation 4n - 3 = 2(2n + 2) - 7 Pick A if the quantity in Column A is greater Pick B if the quantity in Bolumn B is greater Pick C if the two quantities are always equal Pick D if the relationship cannot be determined from the information given.1 solutions Answer 309714 by edjones(7569)   on 2011-05-16 17:02:34 (Show Source): You can put this solution on YOUR website!x-5=3x+7 -12=2x x=6 . 4n-3=2(2n+2)-7 4n-3=4n+4-7 4n-3=4n-3 n can be any number. . D . Ed
 Rate-of-work-word-problems/450204: if one painter can paint a house in 5 days and another painter can paint the same house in 4 days, how long will it take them to paint the house together?1 solutions Answer 309713 by edjones(7569)   on 2011-05-16 16:53:50 (Show Source): You can put this solution on YOUR website!The 1st can do 1/5 the job in a day and the 2nd 1/4 the job in a day. Together: 1/5 + 1/4 = 1/t 4/20 + 5/20 = 1/t 9/20=1/t t=20/9 hrs. . Ed
 test/450207: 4y-2x+3x-7y how do you solve it?1 solutions Answer 309712 by edjones(7569)   on 2011-05-16 16:50:22 (Show Source): You can put this solution on YOUR website!Solve it for what?
 Mixture_Word_Problems/450199: Theresa Morgan, a chemist, has a 25% hydrochloric acid solution and a 50% hydrochloric acid solution. How many liters of each should she mix to get 10 liters of a hydrochloric acid solution with a 40% acid concentration?1 solutions Answer 309711 by edjones(7569)   on 2011-05-16 16:49:38 (Show Source): You can put this solution on YOUR website!Let x=vol. in L. .25 x = .25x .50(10-x)=5-.5x . .25x+5-.5x=10*.4 -.25x+5=4 -.25x=-1 x=4 L of 25% HCl 10-x=6 L of 50% HCl . Ed
 Square-cubic-other-roots/450186: Square root 25 + square root 125 Can you please help? 1 solutions Answer 309710 by edjones(7569)   on 2011-05-16 16:41:05 (Show Source): You can put this solution on YOUR website!sqrt(25)+sqrt(25*5) =5+5sqrt(5) . Ed
 Probability-and-statistics/450194: there are two spinners. one is numbered from 1 to 8 and the other is numbered from 1 to 4. what is the probability that both spinners will land on the same number? I thought that it should be 1/32, but wasn't sure.1 solutions Answer 309708 by edjones(7569)   on 2011-05-16 16:37:13 (Show Source): You can put this solution on YOUR website!Spin the 1 to four spinner first. One of four numbers are spun. Now spin the 2nd spinner. It has 1/8 chance of landing on the same number. 1/8 Answer. . Ed
 Sequences-and-series/450141: find the fifth term of the expression (2a+b)^91 solutions Answer 309687 by edjones(7569)   on 2011-05-16 15:13:21 (Show Source): You can put this solution on YOUR website!(2a+b)^9 expansion of a binomial. 9C5=126 coefficient of the 5th term. 126*2^5*a^5*b^4 =4032a^5b^4 . Ed
 Permutations/450113: The numbers of absent days a student had in the last 5 months are {0,4,2,0,3}. What is the approximate variance of this data? my options are: F 1.6 H 2.6 G 1.8 J 2.81 solutions Answer 309683 by edjones(7569)   on 2011-05-16 14:47:14 (Show Source): You can put this solution on YOUR website!m=9/5=1.8 . 0-1.8=-1.8^2=3.24 4-1.8=2.2^2=4.84 2-1.8=0.2^2=.04 0-1.8=-1.8^2=3.24 3-1.8=1.2^2=1.44 ===========>12.8 . 12.8/4=3.2 Variance . Ed
 Probability-and-statistics/450112: A deck of cards consists of five yellow cards numbered 1 to 5 and five green cards numbered 1 to 5. How many different six-card hands having four yellow cards and two green cards can be dealt.1 solutions Answer 309678 by edjones(7569)   on 2011-05-16 14:30:00 (Show Source): You can put this solution on YOUR website!How many different six-card hands having four yellow cards and two green cards can be dealt. 5C4 * 5C2 =5*10 =50 . Ed
 Probability-and-statistics/449666: A machine is set to pump cleanser into a process at the rate of 10 gallons per minute. Upon inspection, it is learned that the machine actually pumps cleanser at a rate described by the uniform distribution over the interval 9.5 to 12.5 gallons per minute. Find the probability that between 10.0 gallons and 11.0 gallons are pumped during a randomly selected minute. The answer is 0.33, how do I arrive at that answer?1 solutions Answer 309331 by edjones(7569)   on 2011-05-15 17:53:27 (Show Source): You can put this solution on YOUR website!s=1/2=.5 z=(11-10)/.5=2 Probability = .4772 . Ed
 Rational-functions/449630: The denominator of a rational number is five more than the numerator.if three is added to both numerator and denominator the number becomes 1/2.Find the rational number.1 solutions Answer 309309 by edjones(7569)   on 2011-05-15 16:01:42 (Show Source): You can put this solution on YOUR website!n/d n/(n+5) (n+3)/(n+8)=1/2 n+3=(n+8)/2 2n+6=n+8 n=2 d=7 . 2/7 the rational number. . Ed
 Triangles/449651: I have an isoscles triangle with a base of 4ft and a height of 5 ft. How do I find the length of the other two sides? Thanks1 solutions Answer 309305 by edjones(7569)   on 2011-05-15 15:44:52 (Show Source): You can put this solution on YOUR website!you have a 2 right triangles. The hypotenuse of either one is the side of the isosceles triangle. b^2+a^2=c^2 2^2+5^2 =4+25 =29 c=sqrt(29)' length of one of the other sides of the isosceles triangle. . Ed
 Linear_Equations_And_Systems_Word_Problems/449648: Patient Appointments Some doctors use the formula ND= 1.08T to relate variables N (the number of patient appointments the doctor schedules in one day), D ( the duration of each patient appointment), and T (total number of minutes the doctor can use to see patients in one day). a) Solve the formula for N. b) Use this result to find the number of patient appointments N a doctor should make if she has 6 hours available for patients and each appointment is 15 minutes long. (Round the answer to the nearest whole number.) Please help me, for I am completely lost with this question and with the step by step process. Thank you1 solutions Answer 309300 by edjones(7569)   on 2011-05-15 15:35:26 (Show Source): You can put this solution on YOUR website!nd=1.08t n=1.08t/d =(1.08*360)/15 =25.92 or 26 patient appointments. . Ed
 Probability-and-statistics/449588: 1. (3 points) For a standard normal distribution (m = 0, ¿ = 1) find the probabilities: a. z falling between -1.96 and +1.96 b. z falling above 1.64 c. Falling below -1.96 d. Falling above -1.96 2. (2 points) The four general type of research design are secondary, experiment, observation and survey. Give one advantage and disadvantage of each. 3. (3 points) What are the four ¿levels of measurement¿? Give an example of each explaining why the example fits the definition. 4. (2 points) You have been awarded a grant to study ¿The effects of early intervention on reading ability of elementary school children struggling with reading.¿ Using at least three of the ¿descriptors of research design¿ describe how you would design the study. (Two or three paragraphs will be sufficient --- this could be a 35 page report!) 1 solutions Answer 309294 by edjones(7569)   on 2011-05-15 15:22:52 (Show Source): You can put this solution on YOUR website!1a).4750*2=.95 . b).5-.4495=.0505 . c).5-.4750=.025 . d)1-.025=.975 . Ed
 Systems-of-equations/449595: Please help me solve this eqation fully for x: x/2+x/3=11-x1 solutions Answer 309293 by edjones(7569)   on 2011-05-15 15:09:37 (Show Source): You can put this solution on YOUR website!x/2 + x/3 = 11-x 3x+2x=66-6x multiply each side by 6. 5x=66-6x 11x=66 x=6 . Ed
 Numbers_Word_Problems/449597: Find 3 consecutive multiples of 4 such that twice the sum of the last two numbers decreased by the second number is 4 less than 5 times the first number?1 solutions Answer 309292 by edjones(7569)   on 2011-05-15 15:04:45 (Show Source): You can put this solution on YOUR website!Let the multiples be 4x, 4(x+1) and 4(x+2) 2(4(x+1)+(4(x+2))-4(x+1)=5*4x-4 2(4x+4+4x+8)-4x-4=20x-4 8x+8+8x+16-4x-4=20x-4 12x+20=20x-4 8x=24 x=3 . 12,16 and 20 are the 3 multiples of 4. . Ed
 Permutations/449599: How many different ways can 8 people sit in 9 chairs?1 solutions Answer 309288 by edjones(7569)   on 2011-05-15 14:46:26 (Show Source): You can put this solution on YOUR website!Leaving chair A vacant each time: 8!=40320 40320*9=362,880 . Ed
 test/449601: Based on the example 4^2 = and (-4)^2, David reached the following conclusions: "The square of a number is always greater than the number." Is David correct? If yes, justify your answer. If no, provide a counterexample1 solutions Answer 309287 by edjones(7569)   on 2011-05-15 14:42:38 (Show Source): You can put this solution on YOUR website!No. (1/4)^2=1/16
 Percentage-and-ratio-word-problems/449604: Answers for i ate 1/10 of the apples and used rest to make six pies.i used same numbers of apples for each pie.what fraction of apples i used for each pie1 solutions Answer 309286 by edjones(7569)   on 2011-05-15 14:40:53 (Show Source): You can put this solution on YOUR website!1 - 1/10 = 9/10 9/10 / 6 = 9/10 * 1/6 = 9/60 =3/20 fraction of apples used for each pie. . Ed
 Percentage-and-ratio-word-problems/449629: There are 357 seniors in Harris High School. The ratio of boys to girls is 7:10. How many boys are in the senior class?1 solutions Answer 309285 by edjones(7569)   on 2011-05-15 14:33:04 (Show Source): You can put this solution on YOUR website!357 * 7/17 = 147 boys