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# Recent problems solved by 'rfer'

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 Travel_Word_Problems/535120: Two cyclists start at the same point and travel in opposite directions. One cyclist travels 9mi/h slower than the other. If the two cyclists are 75mi apart after 3 hours, what is the rate of each cyclist?1 solutions Answer 351770 by rfer(12644)   on 2011-11-21 12:31:48 (Show Source): You can put this solution on YOUR website!x+x-9=75/3 2x=34 x=17 mph x-9=8 mph
 Percentage-and-ratio-word-problems/535062: An SUV that gets 18 miles per gallon is driven 504 miles. How many gallons of gasoline are used on this trip? 1 solutions Answer 351767 by rfer(12644)   on 2011-11-21 12:11:28 (Show Source): You can put this solution on YOUR website!504/18=28 gal
 Linear_Equations_And_Systems_Word_Problems/535108: in 0.45 minutes, 360 people enter and amusement park. at this rate how many will enter the park in an hour?1 solutions Answer 351766 by rfer(12644)   on 2011-11-21 12:09:46 (Show Source): You can put this solution on YOUR website!0.45/360=60/x 0.45x=360*60 0.45x=21600 x=21600/0.45 x=48,000
 Angles/535074: The ratio of the measures of two supplementary angles is 1:8. What are the measures of the two angles?1 solutions Answer 351765 by rfer(12644)   on 2011-11-21 12:06:56 (Show Source): You can put this solution on YOUR website!x+8x=180 9x=180 x=20 8x=160
 Sequences-and-series/535102: Find the missing numbers in the equivalent fractions below: 4/11 = 16/? 1/4 = 3/?1 solutions Answer 351764 by rfer(12644)   on 2011-11-21 12:04:46 (Show Source): You can put this solution on YOUR website!16/44 3/12
 Percentage-and-ratio-word-problems/535103: Deandre's gas tank is 1/2 full after he buys 2 gallons of gas his tank is 2/3 full. how many gallons can his gas tank hold?1 solutions Answer 351763 by rfer(12644)   on 2011-11-21 12:03:35 (Show Source): You can put this solution on YOUR website!2/3-1/2= 4/6-3/6=1/6 2/(1/6)= 2*6/1=12/1=12 gal total
 Equations/534853: can you help me to solve 1/3(x+1)+5/6(x-1)=x-31 solutions Answer 351679 by rfer(12644)   on 2011-11-20 22:28:25 (Show Source): You can put this solution on YOUR website!1/3x+1/3+5/6x-5/6=x-3 7/6x-x=-3-1/3+5/6 1/6x=-2 1/2 x=(-5/2)/(1/6) x=-5/2*6/1 x-30/2 x=-15
 Matrices-and-determiminant/534871: The attendance at a rock concert is 6700 people. The tickets for this concert cost \$40 for floor seats and \$25 for all other seats. The total income of sales was 185,500. write a linear system that models this situation. Using Cramer's rule, substitution method, elimination method, solve this linear system. Then compare all three methods and choose which method you perfer. Work I've done 40x+25y=185,500 I need help to create the other equation for this linear system1 solutions Answer 351677 by rfer(12644)   on 2011-11-20 22:23:58 (Show Source): You can put this solution on YOUR website!f+a=6700 a=6700-f ---------------- 40f+25a=185500 ------------- 40f+25(6700-f)=185500 40f-25f+167500=185500 15f=18000 f=18000/15 f=1200 floor --------------------- a=6700-1200 a=5500 all others --------------- 40*1200+25*5500= 48000+137500=185500
 Finance/534876: how do you solve 1/2a x 6=1/3a1 solutions Answer 351674 by rfer(12644)   on 2011-11-20 22:16:07 (Show Source): You can put this solution on YOUR website!6=(1/3a)/(1/2a) 6=1/3a*2/1a 6=2/3a a=6/(2/3) a=6*3/2 a=18/2 a=9
 Finance/534880: how do you 2a+6=3-1/5a1 solutions Answer 351673 by rfer(12644)   on 2011-11-20 22:13:30 (Show Source): You can put this solution on YOUR website!2a+1/5a=3-6 10/5a+1/5a=-3 11/5a=-3 a=-3/(11/5) a=-3*5/11 a=-15/11 a=-1 4/11
 Finance/534878: how do you solve 2-1/3a=3+1/4a1 solutions Answer 351670 by rfer(12644)   on 2011-11-20 22:10:14 (Show Source): You can put this solution on YOUR website!-1/3a-1/4a=3-2 -4/12a-3/12a=1 -7/12a=1 a=1/(-7/12) a=1*-12/7 a=-12/7 a=-1 5/7
 Angles/534879: if x=2.5 what is the value if y=37(-6)x 1 solutions Answer 351668 by rfer(12644)   on 2011-11-20 22:07:09 (Show Source): You can put this solution on YOUR website!y=37*-6*2.5 y=-555
 Numeric_Fractions/534310: 5x-2=2-5x. what does x equal?1 solutions Answer 351451 by rfer(12644)   on 2011-11-19 17:29:36 (Show Source): You can put this solution on YOUR website!10x=4 x=4/10 x=2/5
 Inequalities/534296: find solution for 20 less than or equal to 4r 1 solutions Answer 351442 by rfer(12644)   on 2011-11-19 15:55:15 (Show Source): You can put this solution on YOUR website!20 <= 4r 20/4 <= r 5 <= r
 Money_Word_Problems/534248: I have £2970 ,, how much this would be after 24 years if 17% is added to the amount each year ?1 solutions Answer 351441 by rfer(12644)   on 2011-11-19 15:52:25 (Show Source): You can put this solution on YOUR website!P=2970(1+0.17)^24 P=2970(1.17)^24 P=2970*43.297 P=128,592.00
 Travel_Word_Problems/534283: KARLA walks 1.5 miles in 15 minutes.How long will it take her to walk 4 miles?1 solutions Answer 351440 by rfer(12644)   on 2011-11-19 15:47:43 (Show Source): You can put this solution on YOUR website!1.5/15=4/x 1.5x=60 x=60/1.5 x=40 minutes
 Problems-with-consecutive-odd-even-integers/534290: Use scienific notation to divide the followering two numbers. Express the aswer using scientific notation; retain at least three decimal places. (5.2 * 10^7) / (3.15 * 10^3)1 solutions Answer 351439 by rfer(12644)   on 2011-11-19 15:45:48 (Show Source): You can put this solution on YOUR website!5.2/3.15=1.651 10^7-10^3=10^4 1.651*10^4
 Miscellaneous_Word_Problems/534084: If m=3 and n=5, what is the value of 4m+mn1 solutions Answer 351272 by rfer(12644)   on 2011-11-18 22:14:23 (Show Source): You can put this solution on YOUR website!4*3+3*5= 12+15=27
 Inequalities/534006: four less than two times a number is greater than thirteen1 solutions Answer 351271 by rfer(12644)   on 2011-11-18 22:10:44 (Show Source): You can put this solution on YOUR website!2x-4 > 13 2x > 17 x > 17/2 x > 8.5
 Rectangles/534043: what are the dimensions of a rectangle of 120 inches if the width is 18 inches more than two times the width1 solutions Answer 351270 by rfer(12644)   on 2011-11-18 22:08:07 (Show Source): You can put this solution on YOUR website!2(2x+18)+2x=120 you do the math Bob
 Distributive-associative-commutative-properties/534015: 5(t+3)+9>=3(t-2)-101 solutions Answer 351269 by rfer(12644)   on 2011-11-18 22:06:17 (Show Source): You can put this solution on YOUR website!5t+15+9 >= 3t-6-10 5t-3t >= -16-24 2t >= -40 t >= -40/2 t >= -20
 Miscellaneous_Word_Problems/534032: Please help! The Smith's Den Floor is 18FT by 51FT. They want to cover the floor with square tiles that are 9/6ft squared. Write and solve an inequality to find the least number of tiles they need to cover the floor. Thank You~ Also, How do you write... Twenty-four is less than five-eights of a number x as an inequality? TYVM.1 solutions Answer 351268 by rfer(12644)   on 2011-11-18 22:02:04 (Show Source): You can put this solution on YOUR website!(18*51)/1.5 < 612 ----------------- 24 < 5/8x 24/(5/8) < x 24*8/5 < x x > 38.4
 Volume/534074: I am having some difficulty V=4/3(3.1416)r^3 The volume of a basketball is 380in^3. Fine the radius of the basketball. Round to the nearest tenth. I have absolutely no idea where to begin....1 solutions Answer 351264 by rfer(12644)   on 2011-11-18 21:54:02 (Show Source): You can put this solution on YOUR website!380=4/3(3.1416)r^3 380=4.1888r^3 380/4.1888=r^3 90.72=r^3 r=cu rt 90.72 r=4.5in
 test/533673: If lisa and fred spent 15.30 but lisa spent 3.50 more than fred, how much each spent? Thanks1 solutions Answer 351109 by rfer(12644)   on 2011-11-17 21:16:54 (Show Source): You can put this solution on YOUR website!x+x+3.5=15.3 2x=11.8 x=11.8/2 x=\$5.90 x+3.50=\$9.40
 Polynomials-and-rational-expressions/533626: How do you factor x squared plus 13x plus 40 ?1 solutions Answer 351106 by rfer(12644)   on 2011-11-17 21:10:14 (Show Source): You can put this solution on YOUR website!(x+8)(x+5)
 Miscellaneous_Word_Problems/533656: A number is added to 4, then the sum is divided by 3. The result it 9. What is the number?1 solutions Answer 351104 by rfer(12644)   on 2011-11-17 21:06:28 (Show Source): You can put this solution on YOUR website!(x+4)/3=9 x+4=27 x=27-4 x=23
 Numeric_Fractions/533628: simplify 9(6m + 3) + 6(1 + 4m)1 solutions Answer 351103 by rfer(12644)   on 2011-11-17 21:04:14 (Show Source): You can put this solution on YOUR website!36m+27+6+24m= 60m+33
 test/533660: 10(-4+y) = 2y1 solutions Answer 351099 by rfer(12644)   on 2011-11-17 21:00:01 (Show Source): You can put this solution on YOUR website!-40+10y=2y 8y=40 y=40/8 y=5
 Inequalities/533043: g + 7 < 191 solutions Answer 350953 by rfer(12644)   on 2011-11-16 21:38:27 (Show Source): You can put this solution on YOUR website!g < 12
 Equations/533065: Five times the quantity s + 6 equals three times the quantity s-2. What value of s makes this sentence true? I wrote my equation as: 5(s+6)=3(s-2) s = -18 Is that correct? 1 solutions Answer 350952 by rfer(12644)   on 2011-11-16 21:37:07 (Show Source): You can put this solution on YOUR website!That is correct. Bob
 Numeric_Fractions/532325: Please help me solve this equation: 6.2h + 5 - 1.4h = 4.8h + 51 solutions Answer 350824 by rfer(12644)   on 2011-11-15 21:44:40 (Show Source): You can put this solution on YOUR website!no solution both h's and the 5's cancel