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Recent problems solved by 'edjones'

edjones answered: 7568 problems
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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): 3/10 1 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=0 1 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=2 1 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)=20 1 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-42 1 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-4 1 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 27/40 1 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-36 1 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 h 1 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 9cm 1 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