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# Recent problems solved by 'rfer'

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 Coordinate-system/229381: when you have 2 sets of numbers, how do you know which set is for the up/down and which is left/rt1 solutions Answer 170140 by rfer(12730)   on 2009-10-21 00:00:02 (Show Source): You can put this solution on YOUR website!x axis is horizontal y axis is vertical in an ordered pair the first number is always the x axis the second is always the y axis (x,y)
 Quadratic-relations-and-conic-sections/229396: i am trying to find the y coordinate of the vertex. the x is -2 and when i plug it in to the equation i get 3(-2)^2+12(-2)+8 =-28, but the answer is supposed to be -4 can someone tell me what i am doing wrong?1 solutions Answer 170137 by rfer(12730)   on 2009-10-20 23:52:18 (Show Source): You can put this solution on YOUR website!I think you lost track of a sign some where. 3(-2)^2+12(-2)+8= 3(+4)-24+8= 12-24+8= 20-24=-4
 Distributive-associative-commutative-properties/229488: My problem is 14(1002)1 solutions Answer 170133 by rfer(12730)   on 2009-10-20 23:44:27 (Show Source): You can put this solution on YOUR website!14(1002) same as 14*1002=14028
 Age_Word_Problems/229505: Could you please help jessica is twice as old as tina. In nine years the sum of their ages will be 66 how old is each today?here's what I have so far... Tina equals t while jessica equals 2t...(T+9)+(2t+9)equals 661 solutions Answer 170131 by rfer(12730)   on 2009-10-20 23:41:29 (Show Source): You can put this solution on YOUR website!t+9+2t+9=66 3t+18=66 3t=48 t=16 2t=32 your equation works Good luck Bob
 Numbers_Word_Problems/229494: i need help with this problem Ken is thinking of a number,Nine more than the product of 4 and the number is 73. Find Kens number1 solutions Answer 170128 by rfer(12730)   on 2009-10-20 23:36:59 (Show Source): You can put this solution on YOUR website!4x+9=73 4x=64 x=16
 Exponents/229500: if y=3 then y3(y3-y)=1 solutions Answer 170127 by rfer(12730)   on 2009-10-20 23:33:53 (Show Source): You can put this solution on YOUR website!y^3(y^3-y)= 3^3(3^3-3)= 27(24)=648
 Travel_Word_Problems/229383: Katherine drove 230 miles. She drove 40mph for the first 2 hours and 50mhp for the rest of her drive. How long did she drive at 50mhp?1 solutions Answer 170077 by rfer(12730)   on 2009-10-20 19:51:53 (Show Source): You can put this solution on YOUR website!230-80=150/50=3 hrs
 Geometry_Word_Problems/229391: A farmer has 2400 feet of fencing and wants to enclose a rectangular area. What is the maximum area? (do not type in units) 1 solutions Answer 170074 by rfer(12730)   on 2009-10-20 19:49:13 (Show Source): You can put this solution on YOUR website!a square is max sq rt of 2400=49 49*49=2400
 Travel_Word_Problems/229388: I really need help. I'm just not getting this at all. Can someone please help? Two cars are traveling in the same direction. The first car is going 45 mi/h and the second car is going 60 mi/h. The first car left 2 hours before the second car. Explain how you could solve an equation with variables on both sides to find how long it will take the second car to catch up to the first.1 solutions Answer 170073 by rfer(12730)   on 2009-10-20 19:47:02 (Show Source): You can put this solution on YOUR website!car A is two hours ahead or 90 miles. overtake speed is 60-45=15 mph. 90/15=6 hrs to catch up. 2(45)/(60-45)=x
 Linear-equations/229195: Find the x and y intercept points of -3x-2y=121 solutions Answer 170026 by rfer(12730)   on 2009-10-20 17:37:10 (Show Source): You can put this solution on YOUR website!y int x=0 (0,-6) x int y=0 (-4,0) -3x-2y=12 -2y=3x+12 2y=-3x-12 y=(-3x-12)/2 y=-3(0)-12/2 y=-6 (0,-6) --------------------- -3x=2y+12 3x=-2y-12 x=(-2y-12)/3 x=-2(0)-12/3 x=-4 (-4,0)
 Problems-with-consecutive-odd-even-integers/229258: An angle (a) measures 20 degrees more than the measure of its complement. Find the angle's supplement. [Hint: what symbol do you use for the word "measures"????]1 solutions Answer 170024 by rfer(12730)   on 2009-10-20 17:30:00 (Show Source): You can put this solution on YOUR website!x+x+20=90 2x=70 x=35 degrees x+20=55 degrees ----------------- 180-55=125 degrees
 Miscellaneous_Word_Problems/229219: When 30% of a number is added to the number, the result is 54.6. What is the number?1 solutions Answer 170022 by rfer(12730)   on 2009-10-20 17:25:11 (Show Source): You can put this solution on YOUR website!x+.3x=54.3 1.3x=54.3 x=41.77
 Graphs/229265: How do you get an equation for a parallel line that passes through a given point? example: (3,4); y=2x-71 solutions Answer 170016 by rfer(12730)   on 2009-10-20 17:18:47 (Show Source): You can put this solution on YOUR website!Plot the point and use the same slope as the first equation. It becomes y=2x-2
 Linear-equations/229277: what is(1,-5),m-3/21 solutions Answer 170012 by rfer(12730)   on 2009-10-20 17:13:23 (Show Source): You can put this solution on YOUR website!y=mx+b y=-3/2x-3.5
 Trigonometry-basics/229280: solve the following equation for the given value of x: y= cos x; for x = 4 pie1 solutions Answer 170010 by rfer(12730)   on 2009-10-20 17:11:11 (Show Source): You can put this solution on YOUR website!y=cos x y=cos(4*3.14) y=cos 12.56 y=0.976
 Numbers_Word_Problems/229208: Of two numbers , one exceeds the other by 32. their sum is 46 . find the numbers.1 solutions Answer 170007 by rfer(12730)   on 2009-10-20 17:07:33 (Show Source): You can put this solution on YOUR website!x+x+32=46 2x=14 x=7 x+32=39
 Surface-area/229263: A trapezoid has three sides of length 4 inches and one side of length 8 inches. What is its area?1 solutions Answer 170006 by rfer(12730)   on 2009-10-20 17:02:54 (Show Source): You can put this solution on YOUR website!find the heigth 16-4=12 sq rt of 12=3.46 ------------------ A=h((b1+b2)/2) A=3.46(12/2) A=3.46*6 A=20.76 sq in
 Miscellaneous_Word_Problems/229240: carry out the indicated operation and give your answer with 2 significant digits 274.23/.087. What is 274.23/.087 with two significant digits? answer in integer or decimal1 solutions Answer 170000 by rfer(12730)   on 2009-10-20 16:52:46 (Show Source): You can put this solution on YOUR website!274.23/.087=3152.07
 Linear_Equations_And_Systems_Word_Problems/228950: Bill travels 8mph and Karen 3mph. They live 8.25 miles apart. How long will it take before they meet?1 solutions Answer 169900 by rfer(12730)   on 2009-10-19 22:41:40 (Show Source): You can put this solution on YOUR website!8.25/11=3/4 hr=45 min
 Linear-equations/229039: I need help with the Linear Equations Clearing Fractions. My question is: (4z+7)/5 = z+2 I can usually get the ones I miss if I leave it alone for a few minutes and go back to it but this one is just not working for me. Thank YOU Very Much, belovedwon@comcast.net 1 solutions Answer 169897 by rfer(12730)   on 2009-10-19 22:36:13 (Show Source): You can put this solution on YOUR website!(4z+7)/5=z+2 multiply by 5 4z+7=(z+2)5 4z+7=5z+10 subtract 4z 7=z+10 subtract 10 z=-3
 expressions/229006: Simplify: -6[39 -(-88 -8)] 1 solutions Answer 169874 by rfer(12730)   on 2009-10-19 21:49:38 (Show Source): You can put this solution on YOUR website!-6(39-(-88-8)) -6(39+96) -6(135) -810
 Linear-equations/229002: Find the slope on the line containing pair of points: (7,5) and (10, -3) m = ?1 solutions Answer 169872 by rfer(12730)   on 2009-10-19 21:47:02 (Show Source): You can put this solution on YOUR website!m=-8/3
 Equations/228992: 6(x)-7=2(x)+29 54-7=18+29 47=47 I know the answer is x=9 But I do not understand how that is. If I were to take the test in this type of question,with different numbers, I wouldn't know how to do it at all! How would I figure these types of questions out? I am completely lost! Please help me! With all appreciation, Amber A1 solutions Answer 169870 by rfer(12730)   on 2009-10-19 21:44:41 (Show Source): You can put this solution on YOUR website!follow the order of operation doing the multiplacation first 6(x)-7=2(x)+29 6x-7=2x+29 add 7 6x=2x+29+7 6x=2x+36 subtract 2x 4x=36 divide by 4 x=9 ------------------------------- 54-7=18+29 combine like terms 47=47 correct
 Miscellaneous_Word_Problems/228913: Write a situation that can be represented by the algebraic expression \$3.25d.1 solutions Answer 169868 by rfer(12730)   on 2009-10-19 21:37:44 (Show Source): You can put this solution on YOUR website!I receive an allowance of \$3.25 a day.
 Miscellaneous_Word_Problems/228911: Write an algebraic expression to represent the cost of a concert ticket h, with a service charge of \$6.751 solutions Answer 169865 by rfer(12730)   on 2009-10-19 21:35:42 (Show Source): You can put this solution on YOUR website!6.75+h
 Miscellaneous_Word_Problems/228912: Write an algebraic expression to represent the cost of m gallons of gasoline if each gallon costs \$1.45.1 solutions Answer 169864 by rfer(12730)   on 2009-10-19 21:33:46 (Show Source): You can put this solution on YOUR website!1.45m
 Linear-equations/228923: When trying to find x and y coordinates how do you use the "T" bar?1 solutions Answer 169861 by rfer(12730)   on 2009-10-19 21:30:54 (Show Source): You can put this solution on YOUR website!your making an input output table x on left y on right after that plot them
 Travel_Word_Problems/228987: What is the difference, in miles, between the two trains after each train travels for 6 hours? Train L and train m leave a station at the same time heading in opposite directions. train l is going north at an average speed of 75 miles per hour. train m is giong south at an average speed of 60 mph?1 solutions Answer 169858 by rfer(12730)   on 2009-10-19 21:28:30 (Show Source): You can put this solution on YOUR website!they are moving apart at 135 mph D=rt D=135*6 D=810 miles
 Rational-functions/228919: how to graph f(x)=-1/2x-11 solutions Answer 169856 by rfer(12730)   on 2009-10-19 21:26:03 (Show Source): You can put this solution on YOUR website!you are given the slope of -1/2 and the y iny of -1 (same as (0,-1) from the y int go 2 right 1 down for a second point and so on.
 Divisibility_and_Prime_Numbers/228978: -5/8 divided by 3/41 solutions Answer 169852 by rfer(12730)   on 2009-10-19 21:20:42 (Show Source): You can put this solution on YOUR website!(-5/8)/(3/4) invert and multiply -5/8*4/3=-20/24=-5/6
 Numbers_Word_Problems/228959: how can i find two consecutive odd integers whose sum is -88?1 solutions Answer 169849 by rfer(12730)   on 2009-10-19 21:18:07 (Show Source): You can put this solution on YOUR website!x+2+x=-88 2x+2=-88 2x=-90 x=-45 x+2=-43