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Recent problems solved by 'rfer'

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Percentage-and-ratio-word-problems/345576: At the end of the day, a storekeeper had $1560 in the cash register, counting both the sale of goods and the sales tax of 4%. Find the amount that is the tax. 1 solutions Answer 247159 by rfer(12731)   on 2010-09-20 13:05:30 (Show Source): You can put this solution on YOUR website! 1560/1.04=1500 in sales 60 tax

Travel_Word_Problems/345583: If a truck enters the highway at 60 mph, and 6 min later a car enters at the same point traveling at 71 mph. How long will it take for the car to pass the truck? 1 solutions Answer 247158 by rfer(12731)   on 2010-09-20 13:03:06 (Show Source): You can put this solution on YOUR website! T has 10 mi lead overtake speed is 11 mph 10/11=0.9 hrs=54 min

Numbers_Word_Problems/345307: My number has double the number of ones as tens. The sum of the digits is 9 . My number is ? 1 solutions Answer 246986 by rfer(12731)   on 2010-09-19 22:00:39 (Show Source): You can put this solution on YOUR website! 3

Inequalities/345391: determine whether the given number satisfies the inequality following it 4,3x - 5 < 7 1 solutions Answer 246983 by rfer(12731)   on 2010-09-19 21:56:37 (Show Source): You can put this solution on YOUR website! it is equal to not less than

Inequalities/345366: Solve the inequality of 18(3 - x) > 60 - 15x 1 solutions Answer 246960 by rfer(12731)   on 2010-09-19 20:56:49 (Show Source): You can put this solution on YOUR website! 54-18x>60-15x -3x>6 x<-2

Inequalities/345364: Solve the inequality of -2y < 14 1 solutions Answer 246959 by rfer(12731)   on 2010-09-19 20:55:31 (Show Source): You can put this solution on YOUR website! y > -7

Numbers_Word_Problems/345316: what is five more than twice a number is three more than four times the number. what is the number please help me im clueless 1 solutions Answer 246957 by rfer(12731)   on 2010-09-19 20:54:16 (Show Source): You can put this solution on YOUR website! 2x+5=4x+3 -2x=-2 x=1 --------------- 2*1+5=4*1+3

Expressions-with-variables/345334: A stackable storage rack holds 22 DvDs and costs $21. How much would it cost to buy enough racks to hold 127 DVDs? Thank you very much. 1 solutions Answer 246955 by rfer(12731)   on 2010-09-19 20:48:56 (Show Source): You can put this solution on YOUR website! 127/22=5.7 6 racks*21=$126

Triangles/345344: what is the perimeter of a right triangle with legs measuring 7 and 24? 1 solutions Answer 246953 by rfer(12731)   on 2010-09-19 20:46:36 (Show Source): You can put this solution on YOUR website! 49+576=625 sq rt 625=25 25+24+7=56

Travel_Word_Problems/345349: If you are going 95 mph how long wil it take you to go 1 and a half miles? 1 solutions Answer 246950 by rfer(12731)   on 2010-09-19 20:43:45 (Show Source): You can put this solution on YOUR website! 1.5/95=0.0158 hrs=0.948 min

test/345350: these are square root problems and my computer dont have the sign .....simplify 3 square root 16 plus 3 square root 128 1 solutions Answer 246948 by rfer(12731)   on 2010-09-19 20:41:36 (Show Source): You can put this solution on YOUR website! 3*4+3*11.31 12+33.3=45.3

Probability-and-statistics/345351: heavy drinking and smoking have been demonstrated to be great risk factors for throat cancer. Research has demonstrated an OR (odds ratio) of 38:1. What does this mean? Is it that they are 38 times more likely to get it? and if so, 38 more times more likely to get it over and above what???? 1 solutions Answer 246946 by rfer(12731)   on 2010-09-19 20:39:24 (Show Source): You can put this solution on YOUR website! 38 times greater chance of getting cancer for every non-smoker or drinker that gets cancer

percentage/345352: If I sold a car for $4680.00 and made a 20% profit, how much did I pay for the car ? how do I figure this out ? 1 solutions Answer 246945 by rfer(12731)   on 2010-09-19 20:36:15 (Show Source): You can put this solution on YOUR website! 4680 is 120% of what you paid 4680/1.2=$3900

Triangles/345354: 1) 30,40,50 dtermine wether each set of measures can be measures of the sides of a triagnle 1 solutions Answer 246944 by rfer(12731)   on 2010-09-19 20:34:27 (Show Source): You can put this solution on YOUR website! this is a clasic 3, 4, 5 triangle

test/345353: what is equivalent to square root 6 times square root 15 1 solutions Answer 246943 by rfer(12731)   on 2010-09-19 20:33:07 (Show Source): You can put this solution on YOUR website! 6*15=90 sq rt 90=9.4868

test/345225: the ratio of right handed students to left handed students in mr duggan's class is 7 to 2.there are 27 students in the class. how many are right handed? 1 solutions Answer 246926 by rfer(12731)   on 2010-09-19 19:33:44 (Show Source): You can put this solution on YOUR website! 7x+2x=27 9x=27 x=3 7x=21 rh 2x=6 lh

Graphs/345297: How do you graph and solve 4r-9>7? 1 solutions Answer 246921 by rfer(12731)   on 2010-09-19 19:28:48 (Show Source): You can put this solution on YOUR website! 4r>16 r>4

Distributive-associative-commutative-properties/345250: TO USE THE ASSOCIATIVE PROPERTY OF ADDITION TO REWRITE THE SUM GROUP OF TERMS,WHAT IS THE LEAST NUMBER OF TERMS YOU NEED. 1 solutions Answer 246918 by rfer(12731)   on 2010-09-19 19:27:33 (Show Source): You can put this solution on YOUR website! two 1+2=3 2+1=3

Angles/345286: The supplement of an angle is 4 more than twice its compliment.Find the measure of the angle. 1 solutions Answer 246917 by rfer(12731)   on 2010-09-19 19:26:17 (Show Source): You can put this solution on YOUR website! x+2x+4=90 3x=86 x=43 2x+4=50 degrees

Exponential-and-logarithmic-functions/345226: sorry on my previous email I didn't write out the equation correctly. This is what I MEANT to write: -3^2 + 10 *insert division symbol* 5 + 6 1 solutions Answer 246915 by rfer(12731)   on 2010-09-19 19:22:54 (Show Source): You can put this solution on YOUR website! follow the order of operations -3^2+10/5+6 -9+2+6=-1

Linear-systems/345258: I need help solving 1/6 minus x/3 < 1/2 need to solve for x. I'm not sure how to solve this with the x variable. 1 solutions Answer 246912 by rfer(12731)   on 2010-09-19 19:18:47 (Show Source): You can put this solution on YOUR website! 1/6-x/3<1/2 -x/3<1/2-1/6 -x/3<3/6-1/6 -x/3<2/6 -x<2/6*1/3 -x<2/18 x>-1/9

Money_Word_Problems/345281: If 2 litre of pop is $2.25 and 750ml is $1.05 which pop has the better price/ml if 1 litre equals 1000 ml 1 solutions Answer 246909 by rfer(12731)   on 2010-09-19 19:14:49 (Show Source): You can put this solution on YOUR website! 2.25/2000=0.001125 1.05/750=0.0014

Signed-numbers/345242: solve the equation 2/5x-1/3x=5 1 solutions Answer 246907 by rfer(12731)   on 2010-09-19 19:12:20 (Show Source): You can put this solution on YOUR website! 6/16x-5/15x=5 1/15x=5 x=5/1*15/1 x=75/1=75

Angles/345255: the larger of two supplementary angles is 28 degrees more than the smaller one. Find the angles. 1 solutions Answer 246905 by rfer(12731)   on 2010-09-19 19:08:04 (Show Source): You can put this solution on YOUR website! x+x+28=180 2x=152 x=76 degrees x+28=104 degrees

Polynomials-and-rational-expressions/345261: a+6a-9=30 2/3+3k/4=71/12 1.1+1.25y=8.62 1 solutions Answer 246904 by rfer(12731)   on 2010-09-19 19:04:13 (Show Source): You can put this solution on YOUR website! a+6a-9=30 7a=39 a=5.57 ----------- 2/3+3k/4=71/12 3k/4=71/12-2/3 3k/4=71/12-8/12 3k/4=63/12 3k=63/12*1/4 3k=63/48 k=63/48*1/3 k=63/144 k=7/16 -------------- 1.1+1.25y=8.62 1.25y=8.62-1.1 1.25y=7.52 y=7.52/1.25 y=6.016

Rational-functions/345264: Factor v^2+10v+25 factor completley thank you 1 solutions Answer 246902 by rfer(12731)   on 2010-09-19 18:56:00 (Show Source): You can put this solution on YOUR website! (v+5)(v+5)

Rational-functions/345262: Factor completely 24-10a+a^2 how do I solve this algebra 2 question? 1 solutions Answer 246901 by rfer(12731)   on 2010-09-19 18:53:01 (Show Source): You can put this solution on YOUR website! (-4+a)(-6+a)

Equations/345267: The equation is "one half of a number increased by 16 is four less than two thirds of the number. x/2 + 16 = 2/3 - 4 We know the answer is x= 120 and the solution is 76 but just don't know how to show the work???? 1 solutions Answer 246900 by rfer(12731)   on 2010-09-19 18:49:47 (Show Source): You can put this solution on YOUR website! 1/2x+16=2/3x-4 3/6x-4/6x=-20 -1/6x=-20 x=-20/1*-6/1 x=120/1=120

Percentage-and-ratio-word-problems/345151: Jim is able to sell a hand-carved statue for $670 which was a 35% profit over his cost. How much did the statue originally cost him? 1 solutions Answer 246870 by rfer(12731)   on 2010-09-19 15:09:25 (Show Source): You can put this solution on YOUR website! 670/1.35=496.30

Polynomials-and-rational-expressions/345121: Please help me answer my homework: 1.) 3/7 - 2/5 / 5/6 + 1/5 2.) 4 - 3/5 / 8/9 + 4/3 1 solutions Answer 246869 by rfer(12731)   on 2010-09-19 15:07:25 (Show Source): You can put this solution on YOUR website! 1) 3/7-2/5/5/6+1/5 follow order of operations 3/7-2/5*6/5+1/5 3/7-12/25+1/5 find common denominator 75/125-84/125+25/125 =16/125 2) 4-3/5/8/9+4/3 4/1-3/5*9/8+4/3 4/1-27/40+4/3 480/120-81/120+160/120 =559/120=4 79/120

test/345134: What is the answer to -59/9 1 solutions Answer 246868 by rfer(12731)   on 2010-09-19 14:55:56 (Show Source): You can put this solution on YOUR website! -6 5/9