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# Recent problems solved by 'rfer'

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 Inequalities/387875: A line is described by the equation y=-2x+1. How would I graph this on a coordinate grid. And what is the value of x when y=999 How do i graph the inequality x-12> -7 1 solutions Answer 274187 by rfer(12654)   on 2010-12-19 15:52:27 (Show Source): You can put this solution on YOUR website!y=-2x+1 (1/2,0) (0,1) ------------ 999=-2x+1 998=-2x x=998/-2 x=-499 ------------------ x > 5 on the number line circle around +5 with arrow to the right
 Travel_Word_Problems/387876: A bicyclist leaves Bay Shore traveling at an average speed of 12 miles per hour. Three hours later, a car leaves Bay Shore, on the same route, traveling at an average speed of 30 miles per hour. How many hours after the car leaves Bay Shore will the car catch up to the cyclist?1 solutions Answer 274186 by rfer(12654)   on 2010-12-19 15:47:52 (Show Source): You can put this solution on YOUR website!36 miles lead 36/30=1 1/5 hrs=1hr 12min
 Linear-equations/387840: Find the slope and y-intercept of the line. Write fractional answers in lowest terms. 2y + 7x + 6 = 11 + 7x. The slope is: _? The y-intercept is (0,_)?1 solutions Answer 274185 by rfer(12654)   on 2010-12-19 15:45:44 (Show Source): You can put this solution on YOUR website!2y=-7x-6+11+7x 2y=5 y=5/2 (0,5/2) any value of x equals y=5/2 no slope horizontal line
 Linear-equations/387842: Find the slope if it exists, of the line containing the pair of points. (-14, -9) and (-15, -20). The slope is: _?1 solutions Answer 274184 by rfer(12654)   on 2010-12-19 15:41:08 (Show Source): You can put this solution on YOUR website!m=(-20--9)/(-15--14) m=-11/-1 m=11
 Rectangles/387873: how can i break down 480 square feet into equal length times width...whats the answer1 solutions Answer 274183 by rfer(12654)   on 2010-12-19 15:37:55 (Show Source): You can put this solution on YOUR website!A=L*W
 Numeric_Fractions/387843: Find the x and y intercepts and graph the equation plotting the intercepts. -7x-8y=561 solutions Answer 274182 by rfer(12654)   on 2010-12-19 15:36:23 (Show Source): You can put this solution on YOUR website!(-8,0) (0,-7)
 Numeric_Fractions/387858: 5x-49>6-8(2x+7)1 solutions Answer 274181 by rfer(12654)   on 2010-12-19 15:34:41 (Show Source): You can put this solution on YOUR website!5x-49 > 6-16x-56 21x > -1 x > -1/21
 Numbers_Word_Problems/387866: Does 1/5 x 1/6 = 1/301 solutions Answer 274180 by rfer(12654)   on 2010-12-19 15:30:46 (Show Source): You can put this solution on YOUR website!yes
 Polynomials-and-rational-expressions/387710: Multiply -5x + 4 by 4x2 + x 1 solutions Answer 274084 by rfer(12654)   on 2010-12-18 23:12:38 (Show Source): You can put this solution on YOUR website!(-5x+4)(4x^2+x) -20x^3-5x^2+16x^2+4x -20x^3+11x^2+4x
 test/387714: Is 120 the least common denominator of 12 and 21?1 solutions Answer 274081 by rfer(12654)   on 2010-12-18 23:10:27 (Show Source): You can put this solution on YOUR website!least common denominator is 3 greatest common denominator is 84
 Inequalities/387645: How do you find the solution to the inequality x-12 > -7 How can you factor the binomial 12x^2y^2 + 8xy^5 by finding the GCF.1 solutions Answer 274064 by rfer(12654)   on 2010-12-18 20:50:06 (Show Source): You can put this solution on YOUR website!x-12 > -7 x > -7+12 x > 5 --------------- 2xy^2(6x+4y^3)
 Travel_Word_Problems/387669: Carlos and Robert leave Cabanatuan city at the same time. They are heading to BuLACAN. Carlos, driving his sports car, travels 65kph. Robert, on a motorcycle travels at 55 kph. How long will it be before they are 55km apart?1 solutions Answer 274062 by rfer(12654)   on 2010-12-18 20:34:42 (Show Source): You can put this solution on YOUR website!moving apaprt at 10 kph 55/10=5.5 hrs
 Polynomials-and-rational-expressions/387685: Chau runs 4 miles in 30 minutes. At the same rate, how many miles would he run in 24 minutes?1 solutions Answer 274061 by rfer(12654)   on 2010-12-18 20:31:30 (Show Source): You can put this solution on YOUR website!4/30=x/24 30x=96 x=3.2 miles
 Polynomials-and-rational-expressions/387687: Divide. Write your answer in lowest terms. 15xy/8x / 9y/5x1 solutions Answer 274060 by rfer(12654)   on 2010-12-18 20:26:45 (Show Source): You can put this solution on YOUR website!invert and multiply 15xy/8x*5x/9y=75x^2y/40x^2=75y/40
 Proportions/387684: Solve the following proportion for u: 10/u = -5/u - 31 solutions Answer 274059 by rfer(12654)   on 2010-12-18 20:23:22 (Show Source): You can put this solution on YOUR website!10u-30=-5u -30=-15u u=2
 Polynomials-and-rational-expressions/387683: Solve the following proportion for u: u/12 = 11/13 Round your answer to the nearest tenth.1 solutions Answer 274058 by rfer(12654)   on 2010-12-18 20:20:30 (Show Source): You can put this solution on YOUR website!13u=132 u=10.2
 Linear-equations/387679: find an equation of the line containing the givin pair of points (-5,-6) (-3,-1)1 solutions Answer 274055 by rfer(12654)   on 2010-12-18 20:18:21 (Show Source): You can put this solution on YOUR website!m=-1--6/-3--5 m=5/2 ------------- y=mx+b -1=5/2(-3)+b -1=-15/2+b -2/2+15/2=b b=13/2 b=6.5 ---------------- y=5/2x+6.5
 Miscellaneous_Word_Problems/387674: The theoretical probability of undesirable side effects resulting from taking Grebex is 2 in 13. If 260 people take Grebex to lower their blood pressure, how many will encounter undesirable side effects? 1 solutions Answer 274053 by rfer(12654)   on 2010-12-18 20:05:02 (Show Source): You can put this solution on YOUR website!2/13=x/260 13x=520 x=40
 Quadratic_Equations/387649: how do you simplify the exspression 6x3over3x4 with a 2 above the whole problem1 solutions Answer 274047 by rfer(12654)   on 2010-12-18 19:27:48 (Show Source): You can put this solution on YOUR website!I think this is what you have (6x^3/3x^4)^2 36x^6/9x^8 4x^-2 1/(4x^2)
 Square-cubic-other-roots/387677: what is the answer to this question : the square root of 50 times the square root of 2?1 solutions Answer 274044 by rfer(12654)   on 2010-12-18 19:20:50 (Show Source): You can put this solution on YOUR website!sqrt(50*2)= sqrt 100=10
 Expressions-with-variables/387676: PLEASE HELP! THANK YOU. Solve my substitution method. 6x+5y = 5 and x = 30 - 5y. I know that in the second equation x is already solved for so I would substitute this into equation one right? 6(30 - 5y) + 5 = 5; 180 - 30y +5 = 5; NOT SURE AFTER THIS. 1 solutions Answer 274043 by rfer(12654)   on 2010-12-18 19:19:10 (Show Source): You can put this solution on YOUR website!you have done the hard part except you lost the y with the first 5 180-30y+5y=5 -25y=-175 y=7 now plug in the 7 solve for x 6x+5*7=5 6x+35=5 6x=-30 x=-5 ------------------- -5=30-5*7
 Surface-area/387665: What is the diameter of a circle that has an area of 106 square inches?1 solutions Answer 274041 by rfer(12654)   on 2010-12-18 17:40:34 (Show Source): You can put this solution on YOUR website!A=pir^2 106/3.14=r^2 r^2=33.76 r=sqrt 33.76 r=5.81 D=2r D=5.81*2 D=11.62 in
 Equations/387644: how do you solve 26=8+v?1 solutions Answer 274040 by rfer(12654)   on 2010-12-18 17:37:50 (Show Source): You can put this solution on YOUR website!26=8+v subtract 8 26-8=v 18=v
 Miscellaneous_Word_Problems/387663: Jocelyn has test scores of 75, 83 and 91 on her first three Algebra tests. What will she need to score on her 4th test so she will have an average of 85?1 solutions Answer 274039 by rfer(12654)   on 2010-12-18 17:35:25 (Show Source): You can put this solution on YOUR website!(75+83+91+x)/4=85 249+x=85*4 x=340-249 x=91
 Quadratic_Equations/387648: how do you simplify the exspression a3b2 over a2b 1 solutions Answer 274038 by rfer(12654)   on 2010-12-18 17:32:55 (Show Source): You can put this solution on YOUR website!a^3b^2/a^2b a^3-a^2=a b^2-b^1=b =ab
 Quadratic_Equations/387654: how do you simplify the exspression r-3s5t2over r2st-21 solutions Answer 274037 by rfer(12654)   on 2010-12-18 17:25:43 (Show Source): You can put this solution on YOUR website!-15t/r-2
 Graphs/387624: Write the slope-intercept equation for the line that passes through (2, -7) and (4, -13). Please show all of your work. 1 solutions Answer 274021 by rfer(12654)   on 2010-12-18 15:38:09 (Show Source): You can put this solution on YOUR website!m= (-13--7)/(4-2) m=-6/2 m=-3 --------------- y=mx+b -7=-3*2+b b=-1 ---------------- y=-3x-1
 Linear-equations/387629: Consider the lines y = 3x + 7 and x + 2y = -10 Are the lines parallel? Explain why by comparing the slopes of the lines. Are the lines perpendicular? Explain why by comparing the slopes of the lines. Do the lines intersect? Explain why. 1 solutions Answer 274019 by rfer(12654)   on 2010-12-18 15:33:59 (Show Source): You can put this solution on YOUR website!y=3x+7 2y=-x-10 y=-1/2x-5 1st part no 2nd part no 3rd part yes at (-3,-3.5) I will let you do the explanations
 Polynomials-and-rational-expressions/387631: can someone help me with this problem? It is a fraction. 3x^2 - 5x over 18x - 301 solutions Answer 274018 by rfer(12654)   on 2010-12-18 15:26:18 (Show Source): You can put this solution on YOUR website!3x^2-5x/18x-30 1/6x with remainder of 0
 Inequalities/387600: Why do you flip the inequality sign when dividing by a negative number?1 solutions Answer 274006 by rfer(12654)   on 2010-12-18 13:43:34 (Show Source): You can put this solution on YOUR website!referr to themathpage.com and look at inequalities. The have some nice examples
 Human-and-algebraic-language/387599: I need help with all math ( ASAP )1 solutions Answer 274005 by rfer(12654)   on 2010-12-18 13:29:07 (Show Source): You can put this solution on YOUR website!post a question