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# Recent problems solved by 'rfer'

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 Systems-of-equations/576686: Five more than 3 times a number is 41. What is the number?1 solutions Answer 369960 by rfer(12644)   on 2012-02-22 21:26:51 (Show Source): You can put this solution on YOUR website!3x+5=41 3x=41-5 3x=36 x=36/3 x=12
 Systems-of-equations/576685: Twice a number plus 4 times the same number is 42. What is the number?1 solutions Answer 369959 by rfer(12644)   on 2012-02-22 21:25:45 (Show Source): You can put this solution on YOUR website!2x+4x=42 6x=42 x=42/6 x=7
 Linear_Equations_And_Systems_Word_Problems/576609: Ration of boys to girls is 9 to 4. you know there are 91 total students. How many of them are boys and how many girls? Thank you1 solutions Answer 369958 by rfer(12644)   on 2012-02-22 21:23:59 (Show Source): You can put this solution on YOUR website!9x+4x=91 13x=91 x=7 9x=63 girls 4x=28 boys
 Miscellaneous_Word_Problems/576610: If grass seed sells for \$8 per pound and you spend \$10, how much did you buy?1 solutions Answer 369956 by rfer(12644)   on 2012-02-22 21:21:35 (Show Source): You can put this solution on YOUR website!1.25 lbs
 Equations/576676: The difference between 8y and 3y is 45. Find the value of y1 solutions Answer 369954 by rfer(12644)   on 2012-02-22 21:20:03 (Show Source): You can put this solution on YOUR website!8y-3y=45 5y=45 y=45/5 y=9
 Linear-equations/576675: What is 5x + 10 = 10y and 3y — 21 = 12x in "y =... " form? I don't get it. My email is chobbs985@gmail.com Thanks 1 solutions Answer 369953 by rfer(12644)   on 2012-02-22 21:18:32 (Show Source): You can put this solution on YOUR website!I believe you want y=0.5x+1 & y=4x-7 ----------------- 10y=5x+10 y=5/10x+10/10 y=0.5x+1 ---------------- 3y-21=12x 3y=12x+21 y=12x/3+21/3 y=4x+7
 Triangles/576622: Find a formula for the length of the altitude to the hypotenuse of a right triangle whose legs have lengths of A and B.1 solutions Answer 369951 by rfer(12644)   on 2012-02-22 21:14:25 (Show Source): You can put this solution on YOUR website!a^2+b^2=c^2 change to c^2-a^2=b^2
 Numbers_Word_Problems/576670: the sum of 5 times a number and four is nine. translate statement into equation and solve1 solutions Answer 369949 by rfer(12644)   on 2012-02-22 21:11:58 (Show Source): You can put this solution on YOUR website!5x+4=9 5x=9-4 5x=5 x=5/5 x=1
 Graphs/576642: find the y intercept of the graph of 2x +5y -10= 01 solutions Answer 369948 by rfer(12644)   on 2012-02-22 21:10:18 (Show Source): You can put this solution on YOUR website!2*0+5y=10 5y=10 y=2 (0,2)
 Quadratic_Equations/576668: x^3=5001 solutions Answer 369945 by rfer(12644)   on 2012-02-22 21:07:32 (Show Source): You can put this solution on YOUR website!x=7.937
 real-numbers/576667: is 3.5 any of these? Real Number Rational Number Irrational Number Integer Whole Number Natural Number 1 solutions Answer 369944 by rfer(12644)   on 2012-02-22 21:06:34 (Show Source): You can put this solution on YOUR website!The first two.
 Geometry_Word_Problems/576624: the width of recangle is 5 feet longer than one forth of its lenght. the perimeter is 80 feet. find its dimensions1 solutions Answer 369943 by rfer(12644)   on 2012-02-22 21:03:29 (Show Source): You can put this solution on YOUR website!2x+2(0.25x+5)=80 2x+0.5x+10=80 2.5x=80-10 2.5x=70 x=70/2.5 x=28ft 0.25x+5=12ft
 Graphs/576640: find the x intercept of the graph of 2x +5y -10= 01 solutions Answer 369940 by rfer(12644)   on 2012-02-22 20:59:12 (Show Source): You can put this solution on YOUR website!2x+5y-10=0 x inter is when y=0 2x+5*0-10=0 2x=10 x=10/2 x=5 (5,0)
 Linear-equations/576639: Write the slope-intercept equation for the line that passes through (-4, 6) and (2, -6). Please show all of your work1 solutions Answer 369939 by rfer(12644)   on 2012-02-22 20:55:41 (Show Source): You can put this solution on YOUR website!m=(-6-6)/(2--4) m=-12/6 m=-2 ---------------- y=mx+b -6=-2*2+b -6=-4+b -2=b -------------- y=-2x-2
 Equations/576657: Helping my grandson with 6th grade Algebra. x+3x=x+x+10 How do I break down to get started in solving? 1 solutions Answer 369937 by rfer(12644)   on 2012-02-22 20:52:30 (Show Source): You can put this solution on YOUR website!combine all of the "x" x+3x=x+x+10 4x=2x+10 subtract 2x from each side 4x-2x=2x-2x+10 2x=10 divide both by 2 2x/2=10/2 x=5
 Probability-and-statistics/576644: 7 - 3 4/9 = ?1 solutions Answer 369936 by rfer(12644)   on 2012-02-22 20:50:06 (Show Source): You can put this solution on YOUR website!6 9/9-3 4/9=3 5/9
 Linear_Equations_And_Systems_Word_Problems/576645: the room numbers of two adjacent classrooms are two consecutive even numbers. If their sum is 654, find the classroom numbers.1 solutions Answer 369935 by rfer(12644)   on 2012-02-22 20:48:56 (Show Source): You can put this solution on YOUR website!654/2=327 326 and 328 --------------- or x+x+2=654 2x=652 x=326 x+2=328
 Triangles/576647: What is the hypotenuse of a right triangle if it's legs are 12cm and 16cm1 solutions Answer 369934 by rfer(12644)   on 2012-02-22 20:46:02 (Show Source): You can put this solution on YOUR website!c=20cm a^2+b^2=c^2 sqrt c^2=20
 Money_Word_Problems/572908: lets say if i invest 4200 for three years and earn 630 whats the simplest interest rate 1 solutions Answer 368569 by rfer(12644)   on 2012-02-14 21:52:44 (Show Source): You can put this solution on YOUR website!I=Prt 630=4200*r*3 630=12600r r=630/12600 r=0.05=5%
 Radicals/572863: Im having a problem figuring out how to solve this equation. 3/2a-5=-1 rational expressions1 solutions Answer 368566 by rfer(12644)   on 2012-02-14 21:50:15 (Show Source): You can put this solution on YOUR website!3/2a-5=-1 3/2a=-1+5 3/2a=4 3=4*2a 3=8a a=3/8
 Numbers_Word_Problems/572911: When 36 is subtracted from the square of a number, the result is 5 times the number. Find the negative solution.1 solutions Answer 368564 by rfer(12644)   on 2012-02-14 21:46:34 (Show Source): You can put this solution on YOUR website!x-36=5x -36=4x x=-36/4 x=-9
 Angles/572918: find an angle which is 25 degree less then 4 times its complement.1 solutions Answer 368563 by rfer(12644)   on 2012-02-14 21:44:50 (Show Source): You can put this solution on YOUR website!x+4x-25=90 5x=90+25 5x=115 x=23 4x-25=67
 Money_Word_Problems/572434: please help. one thousand dollars are invested at 8% interest compound quarterlly. determine how much the investment is worth after 1year, 4years, and 7years1 solutions Answer 368418 by rfer(12644)   on 2012-02-13 23:27:13 (Show Source): You can put this solution on YOUR website!A=P(1+r/4)^(4*t) A=1000(1+0.08/4)^(4*4) A=1000(1.02)^16 A=1000*1.37279 A=\$1372.79 You do the other two. I did the 4yr one.
 Geometry_Word_Problems/572451: How many square feet of surface are in one wall of a swimming pool 80ft long , 3ft deep at one end, and 16ft deep at the other?1 solutions Answer 368417 by rfer(12644)   on 2012-02-13 23:11:22 (Show Source): You can put this solution on YOUR website!make a triangle 80X13 figure that area. (80*13)/2=520 sqft --------------- a rectangle 3X80 3*80=240 --------------- total the two answers 520+240=760 sqft
 Numbers_Word_Problems/572415: The sum of a number and three is less than nineteen less the number. What is this equation?1 solutions Answer 368416 by rfer(12644)   on 2012-02-13 23:04:41 (Show Source): You can put this solution on YOUR website!x+3 < 19-x
 Volume/572419: A storage trunk is 40 inches wide by 28 inches deep by 36 inches high what is the volume of the trunk1 solutions Answer 368415 by rfer(12644)   on 2012-02-13 23:02:31 (Show Source): You can put this solution on YOUR website!40*28*36=40,320 cu in
 Numbers_Word_Problems/572428: Four times a number equal twenty 1 solutions Answer 368414 by rfer(12644)   on 2012-02-13 23:00:17 (Show Source): You can put this solution on YOUR website!4x=20
 Angles/572474: One angle is 20 more than its supplement. calculate both angle measures. 1 solutions Answer 368412 by rfer(12644)   on 2012-02-13 22:56:35 (Show Source): You can put this solution on YOUR website!x+x+20=180 2x=180-20 2x=160 x=160/2 x=80 x+20=100
 Angles/572477: One angle is 10 less than 3 times its supplement. Calculate both angles.1 solutions Answer 368410 by rfer(12644)   on 2012-02-13 22:54:59 (Show Source): You can put this solution on YOUR website!x+3x-10=180 4x=180+10 4x=190 x=190/4 x=47.5 3x-10=132.5
 Numbers_Word_Problems/572359: 17 less than twice a number is -47. Find the number.1 solutions Answer 368383 by rfer(12644)   on 2012-02-13 20:06:14 (Show Source): You can put this solution on YOUR website!2x-17=-47 2x=-47+17 2x=-30 x=-30/2 x=-15
 Rational-functions/572361: 2= 4/n + 1/31 solutions Answer 368382 by rfer(12644)   on 2012-02-13 20:03:31 (Show Source): You can put this solution on YOUR website!2-1/3=4/n 5/3=4/n 5/3n=4 n=4/(5/3) n=4*3/5 n=12/5 n=2 2/5