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# Recent problems solved by 'rfer'

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 Quadratic_Equations/458307: Enter the quadratic equation in standard form. Use the caret (^) to enter exponents. For example, enter x2 as x^2. 2x2 - 12 + 2x = (x - 2)2 + 2 I have yet to learn how to do this..1 solutions Answer 314411 by rfer(12657)   on 2011-06-06 22:23:09 (Show Source): You can put this solution on YOUR website!2x^2-12+2x=x^2-2x-2x+4+2 2x^2+2x-12=x^2-4x+6 2x^2+6x-18=x^2 x^2+6x-18=0
 Linear-equations/458322: help to solve and show how to solve 2/3(2x-1/6)-3/4=1/41 solutions Answer 314409 by rfer(12657)   on 2011-06-06 22:17:27 (Show Source): You can put this solution on YOUR website!4/3x-1/9-3/4=1/4 4/3x-4/36-27/36=1/4 4/3x-31/36=1/4 4/3x=1/4+31/36 4/3x=9/36+31/36 4/3x=40/36 x=20/18*3/4 x=60/72 x=5/6
 Equations/458288: If a average female math class has a weight of 125 and a height of 5'5" but Kelly has a height of 5'0" how much does she weigh1 solutions Answer 314373 by rfer(12657)   on 2011-06-06 20:12:19 (Show Source): You can put this solution on YOUR website!5.42/125=5/x 5.42x=625 x=115.4 lbs
 Numbers_Word_Problems/458180: one number is 21 less then another number. If the sum of the two numbers is 91, find the two numbers. 1 solutions Answer 314348 by rfer(12657)   on 2011-06-06 18:41:19 (Show Source): You can put this solution on YOUR website!x+x-21=91 2x=91+21 2x=112 x=56 x-21=35
 Expressions-with-variables/458259: Can you please help me with the following problem? 6b = 3(b-33) Thank you! I am trying to help my son with his homework. I appreciate your help. Kerri1 solutions Answer 314346 by rfer(12657)   on 2011-06-06 18:38:37 (Show Source): You can put this solution on YOUR website!6b=3b-99 6b-3b=99 3b=99 b=33
 Rectangles/458247: Geometry really confuses me. Thanks for your help/: The diagonal of a square has length 20^2. What is the area of the square?1 solutions Answer 314345 by rfer(12657)   on 2011-06-06 18:37:16 (Show Source): You can put this solution on YOUR website!each side=14.14 a=14.14^2 a=200 sq units
 Distributive-associative-commutative-properties/458258: The problem asks to use the commutative law and write an equivalent expression for 5(8+x)1 solutions Answer 314342 by rfer(12657)   on 2011-06-06 18:33:28 (Show Source): You can put this solution on YOUR website!40+5x
 Quadratic_Equations/458251: find the vertex, line of symmetry, and maximum or minimum value of the quadratic function: f(x)= -x^2 + 12x + 61 solutions Answer 314341 by rfer(12657)   on 2011-06-06 18:32:53 (Show Source): You can put this solution on YOUR website!vertex=(6,42) maximum axis=6
 Quadratic_Equations/458252: find the vertex, line of symmetry , and maximum or minimum value of the quadratic function: f(x)= 2x^2 - 8x + 221 solutions Answer 314339 by rfer(12657)   on 2011-06-06 18:31:19 (Show Source): You can put this solution on YOUR website!vertex (2,14)minimum axis=2
 Equations/458105: Hal purchased a 200-minute calling card for \$5.00. After he used all the minutes on that card, he purchased another card from the same company at a price of \$13.75 for 550 minutes. Let y represent the cost of the card in dollars and x represent the number of minutes. y=?1 solutions Answer 314305 by rfer(12657)   on 2011-06-06 16:42:37 (Show Source): You can put this solution on YOUR website!y=\$0.025 per minute each card
 test/458178: A formula is used for calculating velocity is v=1/2at^2. what is a expressed in terms of v and t?1 solutions Answer 314302 by rfer(12657)   on 2011-06-06 16:39:32 (Show Source): You can put this solution on YOUR website!a=v/(1/2t^2)
 Linear-systems/458164: i need help. write a system of equations. The receipts from 300 tickets for a high school program were \$650. Adults were charged \$2.50 each and the students \$1.50. How many tickets of each kind were sold?1 solutions Answer 314299 by rfer(12657)   on 2011-06-06 16:37:58 (Show Source): You can put this solution on YOUR website!a+s=300 s=300-a --------------- 2.50a+1.50s=650 2.50a+1.50(300-a)=650 2.50a+450-1.50a=650 a=200 ----------------- s=300-200 s=100
 Numbers_Word_Problems/458211: Five times the difference of number and ten is sixty1 solutions Answer 314294 by rfer(12657)   on 2011-06-06 16:32:25 (Show Source): You can put this solution on YOUR website!(x-10)*5=60 5x-50=60 5x=110 x=22
 Equations/458106: Perform the indicated division. (3x^3 − 3x − 5) ÷ (x + 2) 1 solutions Answer 314266 by rfer(12657)   on 2011-06-06 15:22:53 (Show Source): You can put this solution on YOUR website!3x^2-6x+9 R=-23
 Equations/458080: how much average current can be drawn from an 80Ah battery for 10h 1 solutions Answer 314209 by rfer(12657)   on 2011-06-06 12:12:06 (Show Source): You can put this solution on YOUR website!80/10=8A
 Graphs/458039: Find the x- and y-intercepts and graph the equation plotting the intercepts. Please show all work. -4 x - 5y = 301 solutions Answer 314208 by rfer(12657)   on 2011-06-06 12:08:06 (Show Source): You can put this solution on YOUR website! y int=-6 (0,-6) x int=-7.5 (-7.5,0)
 Numeric_Fractions/458040: Combine like terms- 13a-15b-a=2b= ?1 solutions Answer 314207 by rfer(12657)   on 2011-06-06 12:06:25 (Show Source): You can put this solution on YOUR website!12a-17b
 Proportions/458053: (x+10)/(x-6) = (x)/(x+4) solve proportion.1 solutions Answer 314202 by rfer(12657)   on 2011-06-06 11:57:08 (Show Source): You can put this solution on YOUR website!x^2-6x=x^2+4x+10x+40 x^2-6x=x^2+14x+40 -20x=40 x=-2