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# Recent problems solved by 'checkley77'

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 Graphs/247492: find the slope of the line 2x-5y= -251 solutions Answer 180534 by checkley77(12569)   on 2009-12-08 20:04:36 (Show Source): You can put this solution on YOUR website!Y=mX+b m=slope & b= the Y intercept. 2x-5y= -25 -5y=-2x-25 y=-2x/-5-25/-5 y=2x/5+5 Slope=2/5 (graph 300x200 pixels, x from -16 to 5, y from -10 to 10, 2x/5 +5).
 Graphs/247493: y= 5 over 2x1 solutions Answer 180531 by checkley77(12569)   on 2009-12-08 19:59:30 (Show Source): You can put this solution on YOUR website!y= 5/2x (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 5x/2).
 Miscellaneous_Word_Problems/247484: The sum of two numbers is twentyone. three times the smaller is two less than twice the larger number. find the two numbers1 solutions Answer 180530 by checkley77(12569)   on 2009-12-08 19:55:57 (Show Source): You can put this solution on YOUR website!x+y=21 or x=21-y 3x=2y-2 substitute (21-y) for x in this equation & solve for y. 3(21-y)=2y-2 63-3y=2y-2 -3y-2y=-2-63 -5y=-65 y=-65/-5 y=13 ans. x+13=21 x=21-13 x=8 ans. Proof: 3*8=2*13-2 24=26-2 24=24
 decimal-numbers/247457: What is 12,903,899 rounded to the nearest ten thousand?1 solutions Answer 180529 by checkley77(12569)   on 2009-12-08 19:49:27 (Show Source): You can put this solution on YOUR website!12,903,899 12,900,000 rounded to the 10 thousand position.
 Linear_Equations_And_Systems_Word_Problems/247474: Maggie timed how long it took her to finish a jigsaw puzzle. The first time she finished in 12 minutes. She was able to finish the puzzle twice as fast the second time and three times as fast the third time. How long did it take her to finish the puzzle the second and third times?1 solutions Answer 180528 by checkley77(12569)   on 2009-12-08 19:44:02 (Show Source): You can put this solution on YOUR website!12/2=6 MIN. FOR THE SECOND PUZZLE. 12/3=4 MIN. FOR THR THIRD PUZZLE.
 Equations/247469: 1/2+(2/3*3/4)-(4/5x5/6)=1 solutions Answer 180527 by checkley77(12569)   on 2009-12-08 19:40:37 (Show Source): You can put this solution on YOUR website!1/2+(2/3*3/4)-(4/5x5/6) 1/2+6/12-20/30 1/2+1/2-2/3 1-2/3=1/3 ANS.
 Miscellaneous_Word_Problems/247470: An electronics store uses a mark up rate of 58%. find the selling price of the camcorder that costs the storre owner \$3581 solutions Answer 180526 by checkley77(12569)   on 2009-12-08 19:34:57 (Show Source): You can put this solution on YOUR website!TO GET A MARK-UP OF 58% YOU NEED TO MILTIPLY THE BASE PRICE BY 1 PLUS .58. OR YOU CAN MULTIPLY THE BASE PRICE BY .58 & THEN ADD THE BASE PRICE. THE RESULT SHOULD BE THE SAME. 358*(1+.58) *****358 ****1.58 ---------------- ****2864 ***1790 ***358 ----------------- **565.64 \$565.64 IS THE SELLING PRICE.
 Polynomials-and-rational-expressions/247448: (5x-5)(6x+3)=0 solve1 solutions Answer 180524 by checkley77(12569)   on 2009-12-08 19:32:10 (Show Source): You can put this solution on YOUR website!(5x-5)(6x+3)=0 5X-5=0 5X=5 X=5/5 X=1 ANS. 6X+3=0 6X=-3 X=-3/6 X=-1/2 ANS.
 Equations/247449: i need to find the value of "y" in the equation 6y+2=2y*y-6. i forgot how to remove the y*y (y squared)and solve.1 solutions Answer 180523 by checkley77(12569)   on 2009-12-08 19:29:57 (Show Source): You can put this solution on YOUR website!6y+2=2y*y-6. 6Y+2=2Y^2-6 Y^2-6Y-6-2=0 Y^2-6Y-8=0 Y=(6+-SQRT[-6^2-4*1*-8])/2*1 Y=(6+-SQRT[36+32])/2 Y=(6+-SQRT68)/2 Y=(6+-8.246)/2 Y=(6+8.246)/2 Y=14.246/2 Y=7.123 ANS. Y=(6-8.246)/2 Y=-2.246/2 Y=-1.123 ANS.
 Travel_Word_Problems/247451: If two cars are going one hundred mph towards each other, and they were one milea apart, how long would it take them to crash? 1 solutions Answer 180521 by checkley77(12569)   on 2009-12-08 19:22:00 (Show Source): You can put this solution on YOUR website!D=RT .5=100T T=.5/100 T=.005 HOURS OR .3 MINUTES OR 18 SECONDS.
 Reduction-of-unit-multipliers/247452: 50 millimeters is how many meters? 1 solutions Answer 180519 by checkley77(12569)   on 2009-12-08 19:17:47 (Show Source): You can put this solution on YOUR website!50 millimeters is how many meters? 1 ml-.001 meters. 1/50=.001/50 x=.001*50 x=.05 or 50 ml=.05 meters.
 Exponents-negative-and-fractional/247366: b^12-w^2 I have to factor the polynomial completely but if it cannont be factored than it's prime. I think it can be factors but I am not sure how to do it when the exponents are this large. Thanks for you help:)1 solutions Answer 180517 by checkley77(12569)   on 2009-12-08 19:09:21 (Show Source): You can put this solution on YOUR website!b^12-w^2 (b^6+w)(b^6-w) ans. Proof: b^6+w b^6-w multiply ---------------- b^12+b^6w-b^6w+w^2 b^12+w^2
 Average/247367: if a sale price of car is 12950, with 20% dicount of original price. what would be original price of car1 solutions Answer 180514 by checkley77(12569)   on 2009-12-08 19:05:13 (Show Source): You can put this solution on YOUR website!x-.2x=12,950 .8x=12,950 x=12.950/.8 x=\$16,187.50 was the original price.
 Exponents/247369: 3x-6>-18 and 2x<-101 solutions Answer 180513 by checkley77(12569)   on 2009-12-08 19:02:25 (Show Source): You can put this solution on YOUR website!3x-6>-18 3x>-18+6 3x>-12 x>-12/3 x>-4 Proof: Let x=-3.9 3*-3.9-6>-18 -11.7-6>-18 -17.7>-18 -------------------- 2x<-10 x<-10/2 x<-5 ans. Proof: Let x=-5.1 2*-5.1<-10 -10.2<-10
 Reduction-of-unit-multipliers/247373: Write a perfect square trinomial that has a term of -16x1 solutions Answer 180506 by checkley77(12569)   on 2009-12-08 18:44:07 (Show Source): You can put this solution on YOUR website!x^2-16x+64=(x-8)^2
 Quadratic_Equations/247379: Solve the equation using the quadratic formula. 4x^2 - 23x - 6 = 01 solutions Answer 180504 by checkley77(12569)   on 2009-12-08 18:40:23 (Show Source): You can put this solution on YOUR website!4x^2 - 23x - 6 = 0 x=(23+-sqrt[-23^2-4*4*-6])/2*4 x=(23+-sqrt[529+96])/8 x=(23+-sqrt625)/8 x=(23+-25)/8 x=(23+25)/8 x=48/8 x=6 ans. x=(23-25)/8 x=-2/8 x=-1/4 ans.
 percentage/247391: How do you turn percentages into parts on a circle or pie graph.1 solutions Answer 180501 by checkley77(12569)   on 2009-12-08 18:34:05 (Show Source): You can put this solution on YOUR website!100%=360 degrees. 50% of 360=180 degrees or 1/2 of the pie. 25% of 360=90 degrees or 1/4 of the pie. 40% of 360=144 degrees or 2/5 of the pie. 75% of 360=270 degrees or 3/4 of the pie. 10% of 360=36 degrees or 1/10 of a pie.
 Quadratic_Equations/247404: solving quadratic eaquations by factoring n-4=n^2-61 solutions Answer 180497 by checkley77(12569)   on 2009-12-08 18:26:59 (Show Source): You can put this solution on YOUR website!n-4=n^2-6 n-4-n^2+6=0 -n^2+n+2=0 n^2-n-2=0 (n-2)(n+1)=0 n-2=0 n=2 ans. n+1=0 n=-1 ans.
 Quadratic_Equations/247383: Determine whether the equation has two distinct real number solutions, one real numbers solution, or no real number solution. 3x^2 + x + 6 = 01 solutions Answer 180494 by checkley77(12569)   on 2009-12-08 18:23:28 (Show Source): You can put this solution on YOUR website!3x^2 + x + 6 = 0 Using determinates we get: b^2-4ac 1^2-4*3*6 1-72=-71 This equation has 2 imaginary number solutions.
 Linear-equations/247386: Using the discriminant, determine the number of x-intercepts the graph of the equation will have. Do not graph the equation. y = x^2 - 4x + 31 solutions Answer 180488 by checkley77(12569)   on 2009-12-08 18:14:44 (Show Source): You can put this solution on YOUR website!y = x^2 - 4x + 3 [b^2-4ac] is the determinate of a quadratic equation. -4^2-4*1*3 16-12=4 4>0 therefore there are 2 real number solutions & they are rational numbers because 4 is a perfect square.
 Graphs/247388: how do i solve y=1/2x-2? 1 solutions Answer 180481 by checkley77(12569)   on 2009-12-08 18:01:41 (Show Source): You can put this solution on YOUR website!y=1/2x-2 Slope=1/2 & y intercept=-2 Set y=0 & solve for the x intercept. 0=x/2-2 x/2=2 x=2*2 x=4 ans. (4,0) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, x/2 -2).
 Quadratic_Equations/247384: Determine whether the equation has two distinct real number solutions, one real numbers solution, or no real number solution. x^2 - 8x + 16 = 01 solutions Answer 180476 by checkley77(12569)   on 2009-12-08 17:57:32 (Show Source): You can put this solution on YOUR website!x^2 - 8x + 16 = 0 (x-4)^2=0 x-4=0 x=4 ans. One real number solution.
 test/247375: Find the slope,if it exists, of the line containing the pair of points, (-10,-6) and (-16,-18) 1 solutions Answer 180474 by checkley77(12569)   on 2009-12-08 17:54:57 (Show Source): You can put this solution on YOUR website!(-10,-6) and (-16,-18) Slope=(-18+6)/(-16+10)=-12/-6=2 ans. -6=2*-10+b -6=-20+b b=-6+20 b=14 ans. for the y intercept. y=2x+14 (graph 300x200 pixels, x from -20 to 5, y from -20 to 15, 2x +14).
 Linear-equations/247335: Find an equation of the line that has a y-intercept of 2 that is parallel to the graph of the line 4x + 2y = 8 1 solutions Answer 180472 by checkley77(12569)   on 2009-12-08 17:47:33 (Show Source): You can put this solution on YOUR website!4x + 2y = 8 2y=-4x+8 y=-4x/2+8/2 y=-2x+4 (red line) A parallel line will also have a slope=-2 & with a y intercept =2 the equation is: y=-2x+2 (green line) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10,of TWO functions -2x +4 and -2x +2).
 Quadratic_Equations/247359: Find the y-intercept, the equation of the axis of symmetry, and the x-coordinate of the vertex. f(x)=-2x^21 solutions Answer 180469 by checkley77(12569)   on 2009-12-08 17:34:05 (Show Source): You can put this solution on YOUR website! f(x)=-2x^2 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = -2x^2). Y intercept (0,0) Axis of symmetry X=0 X intercept (0,0)
 Square-cubic-other-roots/247361: What is the square root of 180 written in simplest radical form?1 solutions Answer 180467 by checkley77(12569)   on 2009-12-08 17:29:12 (Show Source): You can put this solution on YOUR website!SQRT180=SQRT(36*5)=6SQRT5 ANS.
 Travel_Word_Problems/247363: If you drive 3 and half hours at 40 mph how many miles have you driven1 solutions Answer 180465 by checkley77(12569)   on 2009-12-08 17:27:25 (Show Source): You can put this solution on YOUR website!3.5*40=140 MILES.
 Graphs/247350: What are the x and y intericepts for 2y-x=41 solutions Answer 180464 by checkley77(12569)   on 2009-12-08 17:24:06 (Show Source): You can put this solution on YOUR website!2y-x=4 2Y=X+4 Y=X/2+4/2 Y=X/2+2 LET X=0 & SOLVE FOR Y. Y=0/2+2 Y=2 ANS. (0,2) LET Y=0 & SOLVE FOR X. 0=X/2+2 X/2=-2 X=-2*2 x=-4 (-4,0) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, x/2 +2).
 Mixture_Word_Problems/247351: the length of a rectangle is 4 less than 3 times the width. The area is 160 square inches. Find the permeter (so first, find the width and length)1 solutions Answer 180462 by checkley77(12569)   on 2009-12-08 17:19:29 (Show Source): You can put this solution on YOUR website!L=3W-4 LW=160 (3W-4)W=160 3W^2-4W-160=0 (3W+20)(W-8)=0 W-8=0 W=8 ANS. FOR THE WIDTH. L=3*8-4 L=24-4 L=20 ANS. FOR THE LENGTH. PROOF: 8*20=160 160=160
 Graphs/247358: how do i graph 1 solutions Answer 180460 by checkley77(12569)   on 2009-12-08 17:12:56 (Show Source): You can put this solution on YOUR website!y=x^2+8x+7 y=(x+7)(x+1) Set y=0 & solve for x. x+7=0 x=-7 (-7,0) x+1=0 x=-1 (-1,0) set x=0 & solve for y. y=7 (0,7) (graph 300x200 pixels, x from -10 to 5, y from -10 to 10, x^2 +8x +7).
 Graphs/247338: Graph y=2x-11 solutions Answer 180458 by checkley77(12569)   on 2009-12-08 17:07:20 (Show Source): You can put this solution on YOUR website!y=2x-1 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, 2x -1).