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# Recent problems solved by 'edjones'

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 Equations/164733: Factor 10x^2-21x-101 solutions Answer 121396 by edjones(7569)   on 2008-10-29 18:49:58 (Show Source): You can put this solution on YOUR website!10x^2-21x-10 10*-10=-100. What 2 factors of -100 have a sum of -21? Ans -25 and 4. 10x^2+4x-25x-10 =2x(5x+2)-5(5x+2) =(2x-5)(5x+2) . Ed
 Exponents/164730: evaluate is m=-2 and n=3: m^-2+n^-1 -2^-2+3^-1 = -8+(-3) = -11? 1 solutions Answer 121393 by edjones(7569)   on 2008-10-29 18:38:22 (Show Source): You can put this solution on YOUR website!(-2)^(-2)+3^(-1) =1/(-2)^2 + 1/3 =1/4 + 1/3 =3/12 + 4/12 =7/12 . Ed
 Equations/164719: rational equations: Solve for X using LCD method x+1/3 + x-3/4 = 1/61 solutions Answer 121390 by edjones(7569)   on 2008-10-29 18:25:23 (Show Source): You can put this solution on YOUR website!x + 1/3 + x - 3/4 = 1/6 12x+4+12x-9=2 LCD=12 24x-5=2 24x=7 x=7/24 . Ed
 Inequalities/164725: Write an inequality for the phrase. eight less than a number x is at least 171 solutions Answer 121388 by edjones(7569)   on 2008-10-29 18:17:18 (Show Source):
 Geometry_proofs/164726: what are parallel lines 1 solutions Answer 121387 by edjones(7569)   on 2008-10-29 18:14:16 (Show Source): You can put this solution on YOUR website!straight railroad tracks. They never meet.
 Equations/164727: 20 = 6x+ 81 solutions Answer 121386 by edjones(7569)   on 2008-10-29 18:11:22 (Show Source): You can put this solution on YOUR website!6x+ 8=20 6x+8-8=20-8 6x=12 6x/6=12/6 x=2 . Ed
 Miscellaneous_Word_Problems/164709: A batter in a baseball game drops a bunt down the first-base line. It rolls 42ft at an angle of 36 degrees with the base path. The pitcher's mound is 60.5ft from home plate: How far must the pitcher travel to pick up the ball? Answer to the nearest foot. Note a baseball field is a square. I drew the field and the triangle within the square, but i dont think my picture is correct. i came up with 36.23 ft; that xoesnt seem correct to me. Please help1 solutions Answer 121385 by edjones(7569)   on 2008-10-29 18:08:30 (Show Source): You can put this solution on YOUR website!We have 2 sides of a triangle, 60.5 and 42. The angle between them is 45-36=9 deg. SAS triangle. a^2=b^2+c^2-2bc*cosA a^2=60.5^2+42^2-(2*60.5*42*cos(9) =3660.25+1764-(5082*.987688) =5424.25-5019.43 =404.818 a=sqrt(404.818) =20.1201 Answer 20 ft. . Ed
 test/164706: This question is from textbook 0.2y^2+0.03y=0.021 solutions Answer 121383 by edjones(7569)   on 2008-10-29 17:38:14 (Show Source): You can put this solution on YOUR website!0.2y^2+0.03y=0.02 20y^2+3y=2 multiply each side by 100 20y^2+3y-2=0 20*-2=-40. What 2 factors of -40 add up to 3? Ans 8 & -5. 20y^2-5y+8y-2=0 5y(4y-1)+2(4y-1)=0 Factoring by grouping. (5y+2)(4y-1)=0 5y=-2, 4y=1 y=-2/5, y=1/4 . Ed
 Travel_Word_Problems/164707: if a car goes one mile in one minute. how many miles an hour is this?1 solutions Answer 121380 by edjones(7569)   on 2008-10-29 17:26:10 (Show Source): You can put this solution on YOUR website!60 mph
 Equations/164710: This question is from textbook can someone help me with this two question. Classify the function as a linear, quadratic, or exponential. 1. f(x) = -5x - 4 2. f(x) = (x - 5)(x + 4)1 solutions Answer 121378 by edjones(7569)   on 2008-10-29 17:23:56 (Show Source): You can put this solution on YOUR website!1. linear because a graph of f(x) is a straight line and it is of the 1st degree. 2. quadratic because it is a polynomial equation of the 2nd degree. Its graph is a parabola. f(x)=x^2-x-20 . Ed . .
 Geometry_Word_Problems/164713: What is the perimeter of a rectangle 29 in wide, 22 in long?1 solutions Answer 121370 by edjones(7569)   on 2008-10-29 17:08:17 (Show Source): You can put this solution on YOUR website!29*2 + 22*2 =58+44 =102" . Ed
 Miscellaneous_Word_Problems/163802: Three workers set out to plaster a ceiling. One can do the job alone in 2 hours, one in three hours and the last in 4 hours how long does it take them together to plaster the ceiling?1 solutions Answer 120668 by edjones(7569)   on 2008-10-24 01:24:29 (Show Source): You can put this solution on YOUR website!One can do 1/2 the job in 1 hr, another 1/3 and another 1/4 the job in 1 hr. 1/2 + 1/3 + 1/4 =6/12 + 4/12 + 3/12 =13/12 of the job in 1 hr together 12/13 of an hour to do the job working together. . Ed
 Polynomials-and-rational-expressions/163774: 5x=y solve for x1 solutions Answer 120667 by edjones(7569)   on 2008-10-24 01:18:07 (Show Source): You can put this solution on YOUR website!5x=y 5x/5=y/5 x=y/5 . Ed
 Miscellaneous_Word_Problems/163803: one pipe fills a tank in 50 minutes another pipe in 75 how long does it take for both pipes together to fill a tanks? 1 solutions Answer 120666 by edjones(7569)   on 2008-10-24 01:03:13 (Show Source): You can put this solution on YOUR website!One pipe does 1/50 of the job in 1 minute. the other pipe doe 1/75 in 1 minute 1/50 + 1/75 =3/150 + 2/150 = 5/150 = 1/30 of the job in 1 minute. So the tank will be filled in 30 minutes using both pipes. . Ed
 Numbers_Word_Problems/163561: When 28 is added to 3 times a number y and the sum is divided by 2, the result is 2 times the number y. What is the value of y?1 solutions Answer 120531 by edjones(7569)   on 2008-10-23 01:21:46 (Show Source): You can put this solution on YOUR website!(3y+28)/2=2y 3y+28=4y 28=y . Ed
 Permutations/163614: Determine the number of different three letter "words" that can be formed using the letters from the word "ARRANGE"1 solutions Answer 120530 by edjones(7569)   on 2008-10-23 01:02:17 (Show Source): You can put this solution on YOUR website!1st use each letter only once in the 3 letter word: 5P3=5!/(5-3)!=(5*4*3*2)/2=60 2nd use both double letters with one other letter. rrn rnr nrr There are 3 permutations for each of the 4 single letters=12 There are 2 sets of double letters so 24 are the possible permutations. 60+24=84 "words" altogether. . Ed
 Graphs/163618: Describe what the graph of interval [-4,10] looks like1 solutions Answer 120529 by edjones(7569)   on 2008-10-23 00:32:47 (Show Source): You can put this solution on YOUR website!It is a dot located 4 lines left of the origin and 10 lines up.
 Square-cubic-other-roots/163624: rationalize the denominator..plz 3+2sq-root of 5 divided by or over.. 3sq-root 5-41 solutions Answer 120526 by edjones(7569)   on 2008-10-23 00:14:51 (Show Source): You can put this solution on YOUR website! = =
 Probability-and-statistics/163450: What's the probability that a sum of 7 or 11 appears at least twice, if the a pair of fair dice are tossed 3 times.1 solutions Answer 120416 by edjones(7569)   on 2008-10-22 01:47:00 (Show Source): You can put this solution on YOUR website!The probability of 11 on one roll is 2/36 The probability of 7 on one roll is 6/36 The probability of 7 or 11 on one roll is 8/36=2/9 (a+b)^3=a^3+3a^2b+3ab^2+b^3 Let a=2/9 and b=7/9 We are only interested in the 1st 2 terms: (2/9)^3+3(2/9)^2(7/9)=.1262 answer. . Ed
 Linear_Equations_And_Systems_Word_Problems/163453: Can you help me solve this problem: A repairman purchased some washing machine motors for a total of \$224. When the unit cost decreased by \$4, he was able to buy one extra motor for the same total price. How many motors did he buy originally? 1 solutions Answer 120415 by edjones(7569)   on 2008-10-22 01:11:13 (Show Source): You can put this solution on YOUR website!Let n=number of motors & u=unit cost A) n*u=224 B) (n+1)*(u-4)=224 . A) u=224/n B) (n+1)*(224/n -4)=224 (n+1)((224-4n)/n)=224 LCD of 224/n -4 (n+1)(224-4n)=224n multiply each side by n to eliminate the fraction. -4n^2+220n+224=224n n^2-55n-56=-56n divide each side by -4 n^2+n-56=0 (n+8)(n-7)=0 n=7 motors at \$32 8 motors at \$28 . Ed
 Systems-of-equations/163226: This question is from textbook Prentice Hall Algebra 2 with Trigonometry Nancy jogs and walks to school each day. She averages 4 km/h walking and 8 km/h jogging. The distance from home to school is 6km snd she makes the trip in 1 hour. How far does she jog in a trip?1 solutions Answer 120306 by edjones(7569)   on 2008-10-21 03:34:56 (Show Source): You can put this solution on YOUR website!st=d Let j=time jogging and 1-j=time walking. 4(1-j)+8j=6 4-4j+8j=6 4+4j=6 4j=2 j=1/2 hr 8* 1/2=4 mi jogging. . Ed
 Linear-equations/163243: Debbie is making apple dumplings. They have to be made from 6 inch square pieces of dough. In order to make 6 dumplings, what is the formula or equation to determine the size of the rectangle of dough? 1 solutions Answer 120305 by edjones(7569)   on 2008-10-21 03:06:04 (Show Source): You can put this solution on YOUR website!6 inch square pieces are squares with each side 6". The area of each square is 6^2=36 in^2 A 36" by 6" rectangle of dough would allow the cutting out of six 6" square pieces of dough. . Ed
 Functions/163249: x=1/2 f(x)=4x-21 solutions Answer 120304 by edjones(7569)   on 2008-10-21 02:58:00 (Show Source): You can put this solution on YOUR website!x=1/2 f(x)=4x-2 f(x)=4(1/2) -2 f(x)=2-2 f(x)=0 . Ed
 Equations/163272: 4 - 8/3 q = 191 solutions Answer 120303 by edjones(7569)   on 2008-10-21 02:31:58 (Show Source): You can put this solution on YOUR website!4-(8/3)q=19 I assume that this is the problem. 12-8q=57 multiply each side by 3. -8q=45 q=-45/8 . Ed
 Inequalities/163274: Y + 1/2 = - 1/3 (x + 1/2) I am not understanding solving for y using fractions.1 solutions Answer 120302 by edjones(7569)   on 2008-10-21 02:23:47 (Show Source): You can put this solution on YOUR website!y+ 1/2=-1/3(x+ 1/2) y+ 1/2=-x/3 - 1/6 6y+3=-2x-1 multiply each side by 6 (LCM). 6y=-2x-4 y=-x/3-2/3 y=-(x+2)/3 . Ed
 Proportions/163190: write as an equation that represents the relationship between the given variables. Use k as the variation constant. F varies jointly as h and inversely as the square of r1 solutions Answer 120301 by edjones(7569)   on 2008-10-21 02:07:22 (Show Source): You can put this solution on YOUR website!F=h/r^2
 test/163276: please help me evaluate 1)3x^0 2)(3x)^0. are the results different? Why or why not are they different?1 solutions Answer 120300 by edjones(7569)   on 2008-10-21 02:04:09 (Show Source): You can put this solution on YOUR website!1)3 only x is to the 0 power. 2)1 . Ed
 Average/163277: the average of four numbers is 638.4 the first four numbers are 216 159.8 and 301.25 Find the fourth number.1 solutions Answer 120298 by edjones(7569)   on 2008-10-21 02:01:27 (Show Source): You can put this solution on YOUR website!216+159.8+301.25+x=638.4*4 677.05+x=2553.6 x=2553.6-677.05 x=1876.55 . Ed
 Inequalities/163052: can someone help me with this problem please Solve the inequality. x^2 - 1.01x - 83.19 < 0 (Give approximations rounded to the nearest hundredth.) a. (-infinity, -8.63) U (9.64, infinity) b. (9.64, -8.63) c. (-infinity, -9.64) U (8.63, infinity) d. (-9.64, 8.63)1 solutions Answer 120163 by edjones(7569)   on 2008-10-20 02:48:54 (Show Source): You can put this solution on YOUR website!x^2 - 1.01x - 83.19 < 0 Start with the equality x^2 - 1.01x - 83.19 = 0 x=-8.62982, x=9.63982 (quadratic formula) These 2 numbers are inflection points. We can select numbers below -8.7, between the 2 numbers and above 9.7 for x and see what sign y has. x=-10 then x^2 - 1.01x - 83.19=26.91 x=0 then x^2 - 1.01x - 83.19=-83.91 x=10 then x^2 - 1.01x - 83.19=6.71 (-8.62, 9.64) Answer . Ed .
 Probability-and-statistics/163063: in one town, 80% of adults have health insurance. what is the probability that 7 adults selected at random from the town all have health insurance?1 solutions Answer 120162 by edjones(7569)   on 2008-10-20 02:13:26 (Show Source): You can put this solution on YOUR website!.8^7=.209715...
 Probability-and-statistics/163064: assuming that boy and girl babies are equally likely, find the probability that a family with three children has all boys given that the first two are boys.1 solutions Answer 120160 by edjones(7569)   on 2008-10-20 02:08:59 (Show Source): You can put this solution on YOUR website!1/2