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# Recent problems solved by 'rfer'

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 Numbers_Word_Problems/387189: A number minus one is at most nine, or two times the number is at least twenty-four ?1 solutions Answer 273704 by rfer(12730)   on 2010-12-16 20:50:54 (Show Source): You can put this solution on YOUR website!x-1 <= 9 2x >= 24
 Volume/387229: what is the height of a cylinder when the radius is 2in and volume is 64pie in.cubed1 solutions Answer 273702 by rfer(12730)   on 2010-12-16 20:46:49 (Show Source): You can put this solution on YOUR website!V=pir^2h 64*3.14=3.14*2^2*h 64*3.14/3.14*2^2=h 64/4=16 in
 Travel_Word_Problems/387223: Two cyclists start biking from a trail's start 3 hours apart. The second cyclist travels at 10mph and starts 3hrs after the first cyclist who is traveling at 6mph. How much time will pass before the second cyclist catches up with the first from the time the second cyclist started? I have tried making a chart: biker : rate : time : distance 1 : 6mph : T : 6T 2 : 10mph : T+3 : 10(T+3) then 6T=10(T+3)...but that doesnt work out.1 solutions Answer 273699 by rfer(12730)   on 2010-12-16 20:43:27 (Show Source): You can put this solution on YOUR website!18 mile lead overtake speed is 4mph 18/4=4.5 hrs
 Expressions-with-variables/387225: x+2y=9;(17,y)1 solutions Answer 273694 by rfer(12730)   on 2010-12-16 20:36:40 (Show Source): You can put this solution on YOUR website!17+2y=9 2y=-8 y=-4 (17,-4)
 Quadratic_Equations/387209: y=x2+4x+3 Graph using Quadratic Equation. I have a calculator but I really don't know how to use it well. I know how to go to the Y= screen. How do you set this up and graph it. I have one more question, Question Solve with the slope-intercept form of equation (-7,7) and(0,-3). this is what I got. (-7,7) (0,-3) m=7-3/0-7 =4/-7=4/7 y=(4/7)x+b using (0,-3) to solve for b -3=b y=(4/7)x-3 my answer 1 solutions Answer 273683 by rfer(12730)   on 2010-12-16 20:13:20 (Show Source): You can put this solution on YOUR website!I think you lost a minus sign somewhere. m=(-3-+7)/(0--7) m=-10/+7 m=-10/7 ---------------- y=-10/7x-3 make sure my work is good.
 Word_Problems_With_Coins/387142: The Grand Bank loaned one borrower \$25000 and another borrower \$50000 at an interest rate that was twice that of the first. If the combined annual interest received by the bank was \$7500, what was the interest rate for each loan? 1 solutions Answer 273664 by rfer(12730)   on 2010-12-16 18:38:29 (Show Source): You can put this solution on YOUR website!25000x+2(50000x)=7500 25000x+100000x=7500 125000x=7500 x=0.06=6% 2x=0.12=12%
 Percentage-and-ratio-word-problems/387146: On the first day of a sale, a camera was reduces by \$8. This represented 10% of the original price. On the last day of the sale, the camera was sold for 75% of the original price. What was the Final selling price of the camera?1 solutions Answer 273662 by rfer(12730)   on 2010-12-16 18:29:39 (Show Source): You can put this solution on YOUR website!8/0.1=80 80*0.25=\$20
 Linear-systems/387149: use substitution to solve the liner system y=2x-2 and 5x-2y=181 solutions Answer 273661 by rfer(12730)   on 2010-12-16 18:26:03 (Show Source): You can put this solution on YOUR website!5x-2(2x-2)=18 5x-4x+4=18 x=14 ---------------- y=2(14)-2 y=26 ----------------- 5*14-2*26=18 70-52=18
 Money_Word_Problems/387043: what is the total cost of a pair of jeans that are priced \$40.00 if there is a 6.5% sales tax? solve for x: 4(3x-5)=7(2x+3) 1 solutions Answer 273607 by rfer(12730)   on 2010-12-16 15:26:17 (Show Source): You can put this solution on YOUR website!A) 40*1.065=42.60 B) 12x-20=14x+21 add 20 12x=14x+21+20 subtract 14x 12x-14x=21+20 -2x=41 x=-20.5
 Travel_Word_Problems/387078: You walk 3 kilometers to school. It takes you 15 minutes to get there.What is your average speed?1 solutions Answer 273605 by rfer(12730)   on 2010-12-16 15:21:50 (Show Source): You can put this solution on YOUR website!12kph
 expressions/387087: first: -2(a+3b)= second: -2(2x+y)= third: 2(3a+ab)= fourth: -5(3a+2b-6c)= fifth: -(a-3b+x-y)= Thanks a lot...1 solutions Answer 273604 by rfer(12730)   on 2010-12-16 15:20:34 (Show Source): You can put this solution on YOUR website!1)=-2a-6b 2)=-4x-2y 3)=6a+2ab you try the others
 test/386823: Albert spends 2 hours a day on his homework and an hour playing video games. What percent of the day is this? 1 solutions Answer 273450 by rfer(12730)   on 2010-12-15 23:05:21 (Show Source): You can put this solution on YOUR website!3/24=0.125=12.5%
 Equations/386838: Andre hit four more homeruns than twice the number of home runs Larry hit. Together they hit 10 home runs. How many home runs did Andre hit?1 solutions Answer 273449 by rfer(12730)   on 2010-12-15 23:03:20 (Show Source): You can put this solution on YOUR website!2x+4+x=10 3x=6 x=2 2x+4=8
 Linear-systems/386835: I need to find the slope of 2x-5y+19=0. Thank you1 solutions Answer 273447 by rfer(12730)   on 2010-12-15 23:00:50 (Show Source): You can put this solution on YOUR website!change to slope intercept form -5y=-2x-19 5y=2x+19 y=2/5x+19 slope m=2/5
 Numbers_Word_Problems/386849: find the value of two numbers if their sum is 12 and their difference is 21 solutions Answer 273445 by rfer(12730)   on 2010-12-15 22:57:45 (Show Source): You can put this solution on YOUR website!x+x+2=12 2x=10 x=5 x+2=7
 Polynomials-and-rational-expressions/386893: 3/2+r=225 1 solutions Answer 273444 by rfer(12730)   on 2010-12-15 22:56:18 (Show Source): You can put this solution on YOUR website!r=225-1.5 r=223.5 or r=223 1/2
 Linear-systems/386831: I need to find the slope of the line containing (-9, 1/2) and (-5, 1/2).1 solutions Answer 273443 by rfer(12730)   on 2010-12-15 22:54:49 (Show Source): You can put this solution on YOUR website!slope m=(y2-y1)/(x2-x1) m=(.5-.5)/(-5--9) m=0/4 m=0 no slope straight horizontal line
 Numeric_Fractions/386834: Find the slope of (-5,-6) and (0,5)1 solutions Answer 273441 by rfer(12730)   on 2010-12-15 22:51:52 (Show Source): You can put this solution on YOUR website!slope m=(y2-y1)/(x2-x1) m=(5--6)/(0--5) m=11/5
 expressions/386891: Having problems with this equation, answer is supposed to be 26, here is the problem- 29-{5+3[8*(10-8)]-50}= Thanks1 solutions Answer 273439 by rfer(12730)   on 2010-12-15 22:47:28 (Show Source): You can put this solution on YOUR website!29-{5+3[8*2]-50} 29-{5+48-50} 29-(3) 29-3=26
 Graphs/386892: make a table for each equation. then graph the equation. write the equation alons its graph. x+2y=8 1 solutions Answer 273437 by rfer(12730)   on 2010-12-15 22:43:36 (Show Source): You can put this solution on YOUR website!(0,4) (8,0) you find the third one
 Expressions-with-variables/386832: x=2y y=x-21 solutions Answer 273436 by rfer(12730)   on 2010-12-15 22:42:10 (Show Source): You can put this solution on YOUR website!y=2y-2 -y=-2 y=2 ---------------- x=2*2 x=4 ----------- y=x-2 2=4-2