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# Recent problems solved by 'edjones'

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 Miscellaneous_Word_Problems/505591: How many different 3-digit numbers can you write using the digits 0,2,4 and 6 once in each number? I think it's zero because it would be 4-digits.1 solutions Answer 339918 by edjones(7569)   on 2011-09-27 19:23:24 (Show Source): You can put this solution on YOUR website!nPr =4P3 =4!/(4-3)! =24 . Ed
 Linear-equations/505562: please help me solve this problem Sabina goes to a bank and gets change for a \$50 bill consisting of all \$5 bills and \$1 bills. There are 22 bills in all. How many of each kind are there.1 solutions Answer 339916 by edjones(7569)   on 2011-09-27 19:04:48 (Show Source): You can put this solution on YOUR website!x=number of \$5 bills and y=number of ones 5x+y=50 x+y=22 --------Subtract 4x=28 . x=7 y=15 . Ed
 Probability-and-statistics/505553: In a single spin, what is the probability of obtaining a C given the spinner did not land on a B? P(A): 2/5 P(B): 1/5 P(C): 1/10 P(D): 3/101 solutions Answer 339915 by edjones(7569)   on 2011-09-27 18:58:24 (Show Source): You can put this solution on YOUR website!what letters are on the spinner?
 Quadratic_Equations/505556: For which value of x is the following algebraic equation true? x2-4x+4=01 solutions Answer 339914 by edjones(7569)   on 2011-09-27 18:56:42 (Show Source): You can put this solution on YOUR website!x2-4x+4=0 (x-2)(x-2)=0 x=2 . Ed
 Probability-and-statistics/505554: eighty percent of the patients who visit a clinic have brown eyes. On a given morning, all of the six patients who visited the clinic had brown eyes. What is the probability that this will happen? a. 80% b. 46% c. 36% d. 26%1 solutions Answer 339912 by edjones(7569)   on 2011-09-27 18:53:44 (Show Source): You can put this solution on YOUR website!80%=.8 .8^6=.262144=26% . Ed
 Finance/505551: How do you translate n is 8 feet below sea level.1 solutions Answer 339911 by edjones(7569)   on 2011-09-27 18:51:04 (Show Source): You can put this solution on YOUR website!n=-8'
 Equations/505544: 3-4t+11=21 solutions Answer 339910 by edjones(7569)   on 2011-09-27 18:50:22 (Show Source): You can put this solution on YOUR website!3-4t+11=2 -4t+14=2 -4t=-12 t=3 . Ed
 test/505535: -2/5(10j-15)=201 solutions Answer 339908 by edjones(7569)   on 2011-09-27 18:47:27 (Show Source): You can put this solution on YOUR website!-2/5(10j-15)=20 2(10j-15)=-100 multiply each side by 5. 20j-30=-100 20j=-70 j=-7/2 . Ed
 percentage/503744: 78 percent of what is 430?1 solutions Answer 339396 by edjones(7569)   on 2011-09-25 01:02:50 (Show Source): You can put this solution on YOUR website!430*.78=335.4
 Probability-and-statistics/503733: A study of consumer smoking habits includes 182 people in the 18-22 age bracket (48 of whom smoke), 144 people in the 23-30 age bracket (38 of whom smoke), and 97 people in the 31-40 age bracket (27 of whom smoke). If one person is randomly selected from this sample, find the probability of getting someone who is age 23-30 or smokes.1 solutions Answer 339395 by edjones(7569)   on 2011-09-25 01:01:57 (Show Source): You can put this solution on YOUR website!182+144+97=423 38/423 the probability of getting someone who is age 23-30 or smokes. . Ed
 Numbers_Word_Problems/503739: the difference of the reciprocals of two consecutive odd numbers is 1/84. find the numbers.1 solutions Answer 339394 by edjones(7569)   on 2011-09-25 00:57:36 (Show Source): You can put this solution on YOUR website!1/x - 1/(x+2) = 1/84 84(x+2)-84x=x(x+2) multiply each side by 84x(x+2) 84x+168-84x=x^2+2x x^2+2x-168=0 (x-12)(x+14)=0 x=12, x=-14 The numbers are 12 and 14 or -14 and -12. Both sets of numbers are even. . Ed
 percentage/503743: 20 percent of what is 300?1 solutions Answer 339392 by edjones(7569)   on 2011-09-25 00:46:13 (Show Source): You can put this solution on YOUR website!300*.2=60
 Numbers_Word_Problems/502748: two times the difference of one-third of a number and three. the number is nine?1 solutions Answer 338940 by edjones(7569)   on 2011-09-22 19:56:35 (Show Source): You can put this solution on YOUR website!2(x/3 - 3) = x 2x/3 - 6 = x 2x-18=3x x=-18 . Ed
 Geometry_Word_Problems/502743: The length of one leg of a right triangle is 5cm. The hypotenuse is 1 cm more than the other leg. Find the length of the hypotenuse.1 solutions Answer 338936 by edjones(7569)   on 2011-09-22 19:35:38 (Show Source): You can put this solution on YOUR website!a^2+b^2=c^2 b=5 c=a+1 5^2+a^2=(a+1)^2 5^2+a^2=a^2+2a+1 25=2a+1 2a=24 a=12 c=13 cm. length of the hypotenuse. . Ed
 Numbers_Word_Problems/502747: a number made up of the digits 4, 5, and 6 is subtracted from a number made up of the digits 0, 2, 8. the difference is 157. write out the entire problem.1 solutions Answer 338935 by edjones(7569)   on 2011-09-22 19:29:05 (Show Source): You can put this solution on YOUR website!802-645
 Expressions-with-variables/501608: 7c+12=4c+78 is the answer c=22?1 solutions Answer 338573 by edjones(7569)   on 2011-09-21 00:03:13 (Show Source): You can put this solution on YOUR website!yes
 Permutations/501565: A particular brand of shirt comes in colors 13, has a male version and a female version, and comes in 2 sizes for each sex. How many different types of this shirt are made?1 solutions Answer 338571 by edjones(7569)   on 2011-09-21 00:02:07 (Show Source): You can put this solution on YOUR website!13*2*2=52
 Numbers_Word_Problems/501593: The total cost of a sandwich, a glass of milk, and an apple is \$2.35 What was the price of each, if the sandwich cost twice as much as the milk and the apple cost 90 cents less than the sandwich?1 solutions Answer 338567 by edjones(7569)   on 2011-09-20 23:35:01 (Show Source): You can put this solution on YOUR website!s=cost of the sandwich. m=s/2 a=s-.9 s + s/2 + s-.9 = 2.35 2s+s+2s-1.8=4.7 Multiply each side by 2. 5s-1.8=4.7 5s=6.5 s=\$1.30 m=\$.65 a=\$.40 . Ed
 Triangles/501582: if i know the three side lengths of an isosceles triangle how do i figure out the area?1 solutions Answer 338566 by edjones(7569)   on 2011-09-20 23:27:23 (Show Source): You can put this solution on YOUR website!Draw a line (the altitude) from the apex that bisects the base and forms 2 equal right triangles. Determine the length of the altitude from the Pythagorean theorem, a^2+b^2=c^2. Use A=.5ab for the area. . Ed
 Polynomials-and-rational-expressions/501575: 3x^2+15x-421 solutions Answer 338565 by edjones(7569)   on 2011-09-20 23:16:26 (Show Source): You can put this solution on YOUR website!3x^2+15x-42 =3(x^2+5x-14) =3(x+7)(x-2) . Ed
 Polynomials-and-rational-expressions/501578: Simplify: 2/5(5x-10)+4x =(2/5 x 5x)- (2/5 x 10)+4x =2x-4+4x =6x-41 solutions Answer 338564 by edjones(7569)   on 2011-09-20 23:13:46 (Show Source): You can put this solution on YOUR website!correct
 Miscellaneous_Word_Problems/501576: Bob and Jessie each want to buy a candy bar. Jessie is 1 cent short to buy a candy bar and Bob is 7 cents short to buy one as well. So, they decide to combine their savings in order to buy a candy bar to share. Even after they combine their money, they were still unable to buy the candy bar. Find the price of the candy bar. Please, I need this problem to be solved by tomorrow night (9/21/2011). Thanks.1 solutions Answer 338562 by edjones(7569)   on 2011-09-20 23:11:22 (Show Source): You can put this solution on YOUR website!Bob has no money. If he did, he could give Jessie 1 cent. Since Bob is 7 cents short the candy bar costs 7 cents. . Ed
 Money_Word_Problems/501572: A \$15000 investment is to be divided among two stocks so that \$3000 less is invested in one stock than the other. How much will be invested in each. I have to make an equation for this problem. I'm a little stumped.1 solutions Answer 338559 by edjones(7569)   on 2011-09-20 23:06:12 (Show Source): You can put this solution on YOUR website!x is invested in one and x-3000 x+x-3000=15000 2x-3000=15000 2x=18000 x=\$9000 x-3000=\$6000 . Ed
 Travel_Word_Problems/501524: Alice is an alligator. Her swimming speed is 1.80m/s. How much time is needed for her to swim 200m in a lake? I got this one the equation I used was t=d/r (time=distance/rate). I got 111.1s Is this right? The next couple of questions build off each other. The one I am currently stuck on is: Alice swims 1.80m/s in still water. Alice then swims 200m DOWNSTREAM in a river taking 80s. What is the speed of the current? I tried to rearrange and solve the previous equation for (r) since rate is what the unknown is, but ti doesn't come out right I get like 16000s. i need to know what I am doing wrong. I need help mainly with comprehension of the question, I need to know what to ask myself to get the equation going. Please help.1 solutions Answer 338554 by edjones(7569)   on 2011-09-20 22:23:28 (Show Source): You can put this solution on YOUR website!speed*time=distance t=d/s t=200/1.8 =111 1/9 s. . st=d c=speed of current 80(1.8+c)=200 144+80c=200 80c=56 c=.7m/s . Ed
 Radicals/501532: √2x (5+√2x) √8 (12-√2)1 solutions Answer 338551 by edjones(7569)   on 2011-09-20 22:03:07 (Show Source): You can put this solution on YOUR website!√2x (5+√2x) =5sqrt(2x)+2x . √8 (12-√2) =12sqrt(8)-sqrt(16) =12sqrt(4*2)-4 =24sqrt(2)-4 . Ed
 Probability-and-statistics/501519: the answer to 27/401 solutions Answer 338548 by edjones(7569)   on 2011-09-20 21:57:08 (Show Source): You can put this solution on YOUR website!27/40 is an exact answer that cannot be simplified.
 real-numbers/501520: simplify expression square root-361 solutions Answer 338546 by edjones(7569)   on 2011-09-20 21:53:55 (Show Source): You can put this solution on YOUR website!sqrt(-36)=6i
 Surface-area/501514: A=(1/2)h (b1+b2) for h1 solutions Answer 338545 by edjones(7569)   on 2011-09-20 21:51:54 (Show Source): You can put this solution on YOUR website!Formula for the area of a trapezoid.
 Numbers_Word_Problems/501495: I have looked in my textbook, there wasnt anything on word problems, I tried asking my mom, my sister, and my grandmom for help and I still did not recieve any help. I need help with finding the answer to : " 6 is 2 more than the quotient of a number and 4" 1 solutions Answer 338544 by edjones(7569)   on 2011-09-20 21:41:26 (Show Source): You can put this solution on YOUR website!6 = x/4 + 2 Quotient is the result of a division of 2 numbers. 6/2=3. 3 is the quotient. 24=x+8 Multiply each side by 4. x=16 . Ed
 Geometry_Word_Problems/501444: What is the perimeter of a rectangle measuring 5cm by 9cm1 solutions Answer 338534 by edjones(7569)   on 2011-09-20 21:22:33 (Show Source): You can put this solution on YOUR website!2(5+9)=2*14=28
 Numbers_Word_Problems/501445: Find three consecutive odd integers such that 4 times the first is 8 less than 3 times the sum of the last two.1 solutions Answer 338533 by edjones(7569)   on 2011-09-20 21:21:00 (Show Source): You can put this solution on YOUR website!x, x+2, x+4 are the integers 4x+8=3(x+2+x+4) ...=3(2x+6) ...=6x+18 -2x=10 x=-5 -5, -3 and -1 are the integers . Ed