1. math/algebra

    subtract. express in simplest form 13x/30 - 4x/ 15 = factor the first denominator. Get a common denominator. Combine terms. I will be happy to critique your work. ok 13x/30 - 4x/ 15 = This is where I get lost, I know that I have to fins the LCD but when I
  2. math

    3x=13x=96 -6x-11x=-136 6.4x-2.3x=-65.6
  3. algebra

    Find an equation for a line that has a slope of -13 and contains (-7, 2) Answer choices 1. y = -13x - 89 2. y = 13x + 93 3. y = -13x + 19 4. y = 13x - 33
  4. Algebra

    Can you pleas Solve the quadric equation step by step 4x square =13x+2 4x^2 = 13x + 2 subtract 13x and 2 from both sides 4x^2 - 13x - 2 = 0 Now use the quadratic formula, since it does not factor.
  5. intermidate algebra

    Solve each equadratic equation by factoring. 6^2-13x-28 36-13x-28 -13x=-36+28 x=64/13 check this, correct if wrong
  6. algebra2

    Solve each of the following quadratic equations. can some explain how to do these kinds of problems 4x^2=13x+12 i believe if i am understanding this i am supose to add to where i get =0 4x^2-13x+12=0 now what do i need to do I am thinking factoring but I
  7. algebra

    6^2-13x-28 36-13x-28 -13x=-36-28 x=8/13 could you check this problem it had to be done and turn in tonight.
  8. Algebra

    Hello all - I would like to check my work on 2 problems. Solve by factoring : x^2-13x= -12 x^2-13x+12= -12 + 12 x^2-13x+12= 0 (x-1)(x-12)= 0 x = 1 , 12 Solve using the square root property: 2x^2-35=15 2x^2-35-15=0 2x^2-50=0 2(x-5)(x+5)=0 x = 5 , -5 Not
  9. chemistry

    The element X has an atomic mass of 12.80 amu. It is known to have two isotopes 12X and 13X. Which of the following is true about the relative abundancies of 12X and 13X? a) both isotopes occur with the same frequency. b)12X occurs more frequently than 13X
  10. Chemistry

    The element X has an atomic mass of 12.80 amu. It is known to have two isotopes 12X and 13X. Which of the following is true about the relative abundancies of 12X and 13X? a) both isotopes occur with the same frequency. b)12X occurs more frequently than 13X
  11. chem

    The element X has an atomic mass of 12.80 amu. It is known to have two isotopes 12X and 13X. Which of the following is true about the relative abundancies of 12X and 13X? a) both isotopes occur with the same frequency. b)12X occurs more frequently than 13X
  12. intermidate algebra

    6^2-13x=-5 6^2-13x=-5 6^2=13x-5 I have tried this problem so much what am doing wrong.
  13. math

    Simplify (5x+3)+(8x+1) (5x)+(8x)= 13x^2 (5x)+(1)=5x (3)+(8x)=11x (3)+(1)=4 =13x^2+5x+11x+4 =13x^2+16x+4 Is this right or wrong?
  14. Math

    Solve the following equation. 4.7 = 1.13x^2 Do i square root the 1.13x^2 first? or divide both sides by 1.13?
  15. math practice help

    add or subtract (2x^2+6x+1)+(-7x^2+2x-3) 5x^2-4x-2 -5x^2+8x-2 5x^2-8x+2 -9x^2-8x+2 (3x^2-7x-4)-(6x^2-6x+1) -3x^2-x-5 -3x^2-13x+5 9x^2-x+5 3x^2-13x-5 These are just practice problems. could someone help me figure out how to solve them and explain how they
  16. Calculus

    Let 5x^2 - 3xy + 58 = 2y^3 Use implicit differentiation to find y' for the above equation. The first thing I did was move 2y^3 over to that everything is equal to 0. With the -3xy I used the product rule and expanded that. After solving I got.... 10x(3 * y
  17. algebra 2

    2X^4-9X^3+13X^2-X-5=0 Given that one root is 2+i, solve the equation. So far I have it set up like this: 2X^4-9X^3+13X^2-X-5/X^2-4X+5 I don't know how to get the answer, I know that I have to use long division but when I started to try it I kept getting
  18. Math

    Express the product x^2+4x/2x^2+13x+15 x x+5/x^2-16 in simplest form. a)- 1/2x+3 b)x/(2x-16)(x+4) c)(x^2+4x)(x+5)/(2x^2+13x+15)(x^2-16) d)x/(2x-3)(x-4)
  19. Math help please ASAP

    2. Simplify the polynomial. –3f^2 + 4f – 3 + 8f^2 + 7f + 1 5f^2 – 11f + 2 11f^2 + 11f + 2 5f^2 + 11f – 2 –5f^2 + 11f – 2 3. (2x2 + 6x + 1) + (–7x2 + 2x – 3) 5x2 – 4x – 2 –5x2 + 8x – 2 5x2 – 8x + 2 –9x2 – 8x + 2 4. (3x2 – 7x
  20. math

    can someone show me the steps for this problem because i got it incorrect in my exam. Solve each of the following quadratic equations. 4x^2=13x+12 what i had put was that x is 3/4 and x is -4 but i just got my result back and it was wrong... 4x^2 -13x _12
  21. math

    Find the surface area of the right rectangular prism. The height is 2 in, the length is 10 in, and the width is 4 in. I think the answer is 136. I made a formula, 2(8 + 20 + 40) and I got 136. Is this right?
  22. math

    Simplify  (5x+3)+(8x+1)  (5x)+(8x)= 13x^2  (5x)+(1)=5x  (3)+(8x)=11x  (3)+(1)=4  =13x^2+5x+11x+4  =13x^2+16x+4  Is this right or wrong? Simplify (2t^2-3t)-(7t^2-5t)  = (2t^2)-(7t^2)=-5t  = (2t^2)-(-5t)= 7t  =(-3t)-(7t^2)=-10t  =(-3t)-(-5t)=2t 
  23. Algebra

    (i just need help filling in the ? with the reason name) Given: Ray AC is the angle bisector of
  24. Statistics

    The following are the weekly amounts of welfare payments made by the federal government to a sample of six families: $143, $138, $132, $136, $145 and $136. What is the range? $24 $9 $13 $0
  25. connections math

    solve each equation and put it in simplest form. x/5=-2 A)-45 B)35 C)-10 D)21 ???? 13x-7=136 A)11 ******* B)15 C)8 D)9 solve the following equation. 3x-3=15 A)4 B)5 C)6 ****** D)7 ernesto lost 14.5 pounds what equation can we used to find how much we was
  26. Algebra

    A student keeps track of his target heart rate when he is exercising. The range for the number of heart beats per minute R for someone his age is /R-136/ less than or equal to 20. Determine the solution to the inequality. I believe the answer is:
  27. Math

    I know that I posted this already but my question has not been answered.. Solve in the exact form. Original problem: (sqrt of 4x+1)+(sqrt of x+1)=2 4x+1 + 2√(4x^2+13x+3) + x+3 = 4 Where does the 2 come from according to the equation above?? This 2:----->
  28. calculus(equating coefficients)

    Can somebody explain to me why equating coefficients work? Example: 8x^3+13x = Ax^3 + 2Ax + Bx^2 + 2B + Cx + D expanded into: 8x^3 + 13x = Ax^3 + Bx^2 + (2A+C)x + 2(B+D) where A,B,C,D are constants. Why does 8 = A; 0 = B; 13 = 2A + C; etc. I know they have
  29. Math last question.

    (3x^2 - 7x -4) - (6x^2 -6x +1) It's a polynomial I think the answer is D or C, but I'm not sure which one. Help please A. 3x^2 - 13x - 5 B. 9x^2 - x + 5 C. -3x^2 -13x + 5 D. -3x^2 -x -5
  30. Algebra

    Solve the equation using the Quadratic Formula 5xsquared+13x-6=0 i think it is -2/5,3 5x^2 + 13x -6 (5x -2)(x +3)=0 You are correct. From Bob Pursley's work you can see that his solution gives +2/5 and not -2/5. The +2/5 is correct. drbob is right on that.
  31. math ~dont know all but check some~ pls help!!!

    1. Draw a model to represent the polynomial x2 + 2x + 4. (1 point) 1 big square, 1 tall rectangle, 4 little sqaures 1 big square, 2 tall rectangles, 4 little sqaures in the shape of an "L" 2 big sqaures, 4 little squares none of these 2. Simplify the
  32. polynomials naman

    If remainder on division x^3-kx^2+13x-21 by 2x-1 is -21 ,find quotient and k.Hence find zeroes of cubic polynomial x^3 -kx^2+13x-21.
  33. algebra i

    two rubber balls are dropped from two different heights 136 ft and 287 ft. Find the function that describes them. I believe it is H(t) = -16t^2 + 136 and H(t) = -16 ^2 + 287. There are no answers in the book . I assumed velocity is 0. Am I correct? Thanks,
  34. Math

    Express the product, x^2 + 4x divided by 2x^2+13x+15 multiplied by x+5 divided by x^2 - 16 ? a)-1/2x+3 b)x/(2x-16)(x+4) c)(x^2+4x)(x+5) / (2x^2+13x+15)(x^2-16) d)x / (2x+3)(x-4)
  35. Math

    1. (6.0 x 10^5) x (3.0 x 10^4) = a. 18 x 10^20 b. 18 x 10^9 c. 1.8 x 10^20 d. 1.8 x 10^9 2. (5 x 10^-2) ÷ (2 x 10^3) = a. 2.5 x 10^-5 b. 2.5 x 10^-1 c. 25 x 10^1 d. 25 x 10^2 3. (2.56 x 10^6) x (3.56 x 10^2) = a. 9.1136 x 10^12 b. 91.136 x 10^8 c. 9.1136
  36. Math

    A rectangles length and width are in a ratio of 17:2. The area is 136 square yards. What are the length and width. Have no idea how to even start to work this problem other than 17L X 2w= 136
  37. chem

    sodium chloride (relative molecular mass = 58.5) had a solubility of 36.0 g per 100g of water. the density of the solution is 1.13 g/ml. which of the following calculations would give te solubility in moles per liter? A) 36.0 x 10/58.5 b) 36.0 x 10 x
  38. Math check my answers please

    1. x/5=-2 A. -45 B. 35 C. -10 D. 21 2. 13x - 7= 136 A. 11 B. 15 C. 8 D. 9 Solve the following equation 3. 3x - 3=15 A. 4 B. 5 C. 6 D. 7 4. Ernesto loses 14.5 pounds in 7 months. Now he weighs 156.5 pounds. Which equation can be used to find how much he
  39. Math

    3. (2.56 x 10^6) x (3.56 x 10^2) = a. 9.1136 x 10^12 b. 91.136 x 10^8 c. 9.1136 x 10^8 d. 91.136 x 10^12 4. In a recent year, the population of California was about 2.52 x 10^7 people. Its land area is about 4.05 x 10^5 km2. What was the average number of
  40. bookkeeping

    what is the total interest for $2596.40 with a interest rate of %9 percent.with a tiime of 7months 97.37 136.26 136.31 233.68 my answer is 233.68
  41. Math

    My work on simplifying this function: g(x)=(-3x^2-13x-13) g(x)=-3x^2-13x-13 (13x-13=x) g(x)=-3x^2-x Can someone help with the simplifying the function if I have got it wrong and also can someone tell me of it's equivalent to this
  42. pre cal

    let f(x)=13x^3-13x find all x such that f(x)=0
  43. This needs tobe turned in in 10min AT MOST URGENT!

    1. x over 5= –2 (1 point) –45 35 –10 21 2. 13x – 7 = 136 (1 point) 11 15 8 9 3. Solve the following equation: 3x – 3 = 15 (1 point) 4 5 6 7 4. Ernesto loses 14.5 pounds in 7 months. Now he weighs 156.5 pounds. Which equation can be used to find
  44. math

    The area of a square plot of land is 1156m2. The plot is to be fenced with three strands of wire. What is the length of the wire that is needed? Area = S2 √1156 = S S=34 P = 4s = 136 = 136(3) = 408
  45. Calculus check and help

    Let f and g be the functions given by f(x)=1+sin(2x) and g(x)=e^(x/2). Let R be the shaded region in the first quadrant enclosed by the graphs of f and g. A. Find the the area of R. B. Find the value of z so that x=z cuts the solid R into two parts with
  46. algebra

    Megan factored the expression 12x^2+13x-14 as (3x+2)(4x-7). But when Jacob applied the foil principle and multiplied out(3x+2)(4x-7), he got 12x^2-13x-14; thus, Megan's solution does not appear to check. Why is that? Please help Megan to understand this
  47. math

    Josh has 42 more baseball cards than hockey cards. Josh has 136 hockey cards. Which number sentence can be used to find how many baseball cards Josh has? A. 136-42=____ B. 136+42=____
  48. math

    Josh has 42 more baseball cards than hockey cards. Josh has 136 hockey cards. Which number sentence can be used to find how many baseball cards Josh has? A. 136-42=____ B. 136+42=____
  49. Algebra 2

    1.) The cost in C dollars of manufacturing x bicycles at Holliday's Production Plant is given by the function C(x) = 2x2 - 800x + 92,000. Find the minimum cost. 2.) The vertex of y = -3x2- 6x - 9 lies in which quadrant? 3.) Given f(x) = 1/3*(x - 4 )2 + 7.
  50. calculus

    "superman is in level flight 6 miles above ground. his flight plan takes him directly over whs high school. how fast is he flying when the distance between him and the whs high school is exactly 10 miles and the rate is increasing 40mph?" i keep getting: r
  51. Maths

    is this correct... (3x^2+4x-3)^2-(3x^2-x+2)^2 then is it this (9x^4+24x^3-2x^2-24x+9)-(9x^4-6x^3+13x^2-4x+4) or this 9x^4+24x^3-2x^2-24x+9-9x^4-6x^3+13x^2-4x+4 should it have brakets or not that's my only problem thanks
  52. Math

    I don't think I am understanding this question. Question: A zoo started with 16 cranes and panned to hatch 20 chicks. A few birds were kept for breeding and the rest realeased into the wild. At the end of last year, a total of 136 cranes had spent some
  53. Algebra 1b!

    1. Find the excluded value of x for the polynomomial expression 4x/6 a. 6 b. -6 c. 1/6 d. -1/6 2. Simplifly 3-2x/7 + 4x+5/7 a. 2x+8/14 b. 2x+8/7
  54. math

    A piece of wire of length 240 cm is bent into the shape of trapezium where the eqtn is = 13x+13x+y+y+24x. Find the value of x and y for which A is maximum, hence find the maximum area. a. express y in term of x b. show that the area A cm^2 enclosed by the
  55. Algebra

    Please check my answers. Thanks! Solve the polynomial equation. In order to obtain the first root, use synthetic division to test the possible rational roots. 5.2x^3-13x^2+22x-8=0 -My answer:{1/2,2,4} 6.x^3-8x^2-x+8=0 -My answer: {1,-1,8} Find the rational
  56. Algebra

    (x)/(x-3)-4-(2x-5)/(x+2) I posted something before this, so now this is how far I got. The answer I know is -(5x^2-17x-9)/(x-3)(x+2) first I get (x)(x+2)/(x-3)(x+2)- (4)(x-3)(x+2)/(x-3)(x+2)-(2x-5)(x-3)/(x-3)(x+2) Then I get x^2+2x-4x^2-4x-24-2x^2-11x+15
  57. Algebra

    (x)/(x-3)-4-(2x-5)/(x+2) I posted something before this, so now this is how far I got. The answer I know is -(5x^2-17x-9)/(x-3)(x+2) first I get (x)(x+2)/(x-3)(x+2)- (4)(x-3)(x+2)/(x-3)(x+2)-(2x-5)(x-3)/(x-3)(x+2) Then I get x^2+2x-4x^2-4x-24-2x^2-11x+15
  58. Algebra

    Can someone verify if my answers are correct? Solve. 1/x+6-1/x-6 My answer is: -12/x^2-36 Solve. 1/x+5+2=5/x+5 My answer is: -3 Subtract. Express your answer in simplest form. 13x/30-4x/15 My answer is: x/6 Can someone verify if my answers are correct?
  59. *** Discrete Math ***

    I would like to know if my answers are correct. I also need help solving some exercises the right way. (a) Explain why [13] is invertible in Z50. Ans: it's invertible because there's some [t]E Z50 such that [13][t]=1 (b) Use the usual algorithm to find
  60. Algebra

    What percent of 25 is 10? A)10=x•25;40% ** B)10=x•25;250% C)25=x•10;4% D)25=x•10;250% The sales tax is 6.9% A.Find the tax paid for a pair of boots with a list price of $128. B.What is the total cost of the pair of boots. 1)$8.83; $128.88 2)$8.83;
  61. Math help please check

    Add or Subtract for #3-4 3. (2x2 + 6x + 1) + (–7x2 + 2x – 3) 5x2 – 4x – 2 –5x2 + 8x – 2 5x2 – 8x + 2 –9x2 – 8x + 2 4. (3x2 – 7x – 4) – (6x2 – 6x + 1) –3x2 – x –5 –3x2 –13x + 5 9x2 – x + 5 3x2 – 13x – 5 My answers:
  62. Trigonometry

    Stuck :( 1. Simplify (5-√-36)(2+√-1) A. 16 − 7i B. 16 + 7i C. 4 + 7i 2. Choose the point that lies on the curve r = 2 – 3 sin θ. A. (-5, 3π/3) B. (-2, π) C. (1, π/2) 3. Which of the following is not an approximate solution of x5 – 1 = 0? A.
  63. 7th grade math Ms. Sue please

    Find the percent of markup. Round to the nearest whole percent. 6. Store's Cost: $136.50 Selling Price: $184.70 (1 point) 48% 26% 14% 35%6. Store's Cost: $136.50 Selling Price: $184.70 (1 point) 48% 26% 14% 35% So you previously said 48% wasn't
  64. statistics

    Question: In 2001 the stock market took some big swings up and down. One thousand investors were asked how often they tracked their investments. The table below shows their responses. What is the probability that an investor tracks the portfolio monthly?
  65. Physics Energy & Acceleration

    A light spring with force constant 3.45 N/m is compressed by 7.92 cm as it is held between a 0.241 kg block on the left and a 0.482 kg block on the right, both resting on a horizontal surface. The spring exerts a force on each block, tending to push them
  66. statistics

    y=8+13x
  67. algebra

    13x+2>3((2x+1)-x+8
  68. geometry 3

    x^2-13x-30=0 A. -3,-10 B. 3,10 C. -15,2 D. 15,-2 x^+7x-18=0 A. -9,2 B. -6,3 C. -3,6 D. -2,9
  69. mathmetics

    x2-13x+30
  70. simultaneous equation

    13x+6y=41
  71. math

    3x=10+13x
  72. college

    (2x^(2)+7x-15)/(2x^(2)+13x+15)
  73. Algebra 2

    2x^2-13x-7=0
  74. algebra

    13x-24
  75. math

    Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4
  76. statistics

    Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4
  77. statistics

    Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4
  78. john

    Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4
  79. statistics

    Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4
  80. statistics

    Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4
  81. Algebra Systems with Substitution

    I have a similar problem to
  82. Pre-Calculus 12

    2x^3 - 13x^2 + 32x - 13 = 0
  83. algebra 2

    1) 2a+c=-10 b-c=15 a-2b+c=-5 2) x+y+z=3 13x+2x=2 -x-5z=-5 3)x-y+3z=3 -2x+2y-6z=6 y-5z=-3 4)3x-2y+z=1 -x+y-z=2 5x+2y+10z=-39 5)3x-2y+z=1 -x-y-z=-3 3x-2y+3z=-12
  84. algebra

    3bx+13x=9
  85. Math

    x^4 + 10x + 18 - x^4 - 3x + 2 Is this 13x + 16?
  86. math

    13x + 15= 11x - 25
  87. math

    7x+13x=140
  88. math's

    Solve for this 5x^3-13x^2+4x-9 ---------------- 7x^2+2x- 11
  89. algebra

    how would u factor 2x^2 +13x-7 =27? please help
  90. calculus

    Find f'(a) for f(x)=13x/3x+1
  91. math

    what are the roots for x^3-13x-12?
  92. Math

    Differentiate y=13x^2-5x+8
  93. algebra

    18x-6=13x+9
  94. algebra

    factor: 6x^2-13x+6
  95. Quantitative Aptitude

    6y=3=3 2y=2=2 9x=2=2 7x=2=2 5x= 12y= 13x= 6y=
  96. Long Division

    Need desperate help with this question! (x^3-13x-18)/(x-4)
  97. Math

    How do you factorise -13x^2+113x-22
  98. Math - Quadratic Factor

    can someone explain how to do this problem, please. 6x^2 + 13x +2 + 0
  99. Algebra 1

    1.18x^2 + 6 + 4x - 15x^2 - 4 + 13x 2. 2x^2 + 8 - 4x + 3x - 6x^2 + 7
  100. algebra

    Factor each of the following polynomials. 1. x^2+x-6 2. 6x^2+13x-5 Thanx!

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