Posts by Quidditch

Total # Posts: 512

  1. Math

    You are correct!
  2. Science - Please Help!!!

    Where is the energy stored in a flashlight?
  3. Computer Programming

    I think that the semicolon (;) should be deleted in your line: if (a == b) System.out.println(a*b);
  4. Intro to computers

    You are correct!
  5. math

    Yes, you got it! 49 = 49
  6. math

    No, D is not correct. (7*7*7*7)=? (7*7)=? Divide the 4 7s multiplied by the 2 7s. What do you get
  7. math

    What did you get when you calculated 7^4/7^2
  8. math

    You're welcome!
  9. math

    Yes, you got it! 5^0=1
  10. math

    You are correct on 1. The answer is c. You are not correct on 2.

    What did you get when you converted the weight to kg?
  12. math

  13. Electricity and Electronics

    oops... I meant amps.
  14. Electricity and Electronics

    Your are correct! current for 40 volts across 12 ohms: 40V/12 ohms=3.33 smps
  15. Math

    2.5 times $4.00 is the cost to make 1 tent. So, what would it cost to make 4 tents?
  16. Math

    The first equation has y=10-2.2x Substituting that value for y into the second equation: 5x + (10-2.2x)=70 5x + 10-2.2x=70 combining... 2.8x=60 x=? Plug that value for x into the first equation to find y.
  17. Algebra 1

    When you multiplied the second equation by 2 your result is wrong. It should be: 6x + 12y=52 NOT: 6x-12y=52
  18. math

    30% of 200,000 is NOT 6000
  19. math

    Looks good!
  20. Math

    Try multiplying by a/a.
  21. Maths

    Don't forget to think about negative numbers here. What negative numbers would give you a correct answer?
  22. algebra

    Both answers are correct!
  23. Math

    Looks good!
  24. trig

    You have the right idea. one revolution is 2(pi) radians. Converting revolutions to radians: R=revolutions Revolutions in Radians=R*2(pi) So, to convert 2.8 revolutions/sec to radians =2.8(2)(pi)/sec
  25. precalculus

    With the values given, I did not find any of the answers on the graph. For a distance vs time graph. X axis is time and Y axis is distance. at t=6s, dist=5m at t=8s, dist=6m at t=10s, dist=7m at t=12s, dist=8m I don't see any of those as choices.
  26. precalculus

    For problem 2, I got A, x=-1.
  27. precalculus

    C is the answer I got.
  28. precalculus

    Problem 1. Look at my calculation, the average rate is +12,not a negative number.
  29. precalculus

    For a distance vs time graph. X axis is time and Y axis is distance. at t=6s, dist=5m at t=8s, dist=6m at t=10s, dist=7m at t=12s, dist=8m I don't see any of those as choices.
  30. precalculus

    Problem 1 A is not the answer. f(4)- f(1) =11 - (-1) = +12 -------------- Problem 3. C looks correct
  31. precalculus

    Problem 2. The answer is not B, (x=0).
  32. precalculus

    Problem 1. The answer is NOT D. The average rate of change is: for x=1, f(1)=-3 for x=4, f(4)=-3 Average rate of change is 0, not a negative number. One of the answers does give a negative average rate of change.
  33. PreAP Physics

    Yes, that's what I got, also.
  34. Help

    That's correct!
  35. Math

    Let B = the "break even" number of books. Production costs=$76,322 + B * $10 Total Sales = B * $25.50 Setting these equal... Total sales = Production costs or... $76,322 + B * $10 = B * $25.50 Solve for B
  36. MATH 7th GRADE

    1, 2, 3, 4, and 6 look OK I don't understand 5, 7 is wrong.
  37. MAT 7th GRADE

    number 4 should be +5 6 is wrong.
  38. algebra

    slope = rise/run. For a slop of 0.4 0.4 = rise/130 Solve for rise. It looks like you have accidentally moved the decimal in your line: .040=rise
  39. MATh please help

    Let D = the number of dimes. So, D + 9 = the number of nickels. Adding... D * 10 + (D + 9) * 5=135 combining 15 * D + 45 = 135 15 * D = 90 Divide both sides by 15 D = 6 There are six dimes. So, the number of nickels is 6 + 9 = 15
  40. physics

    The time is takes to slow down is T2 - T1. That is given as 3.0s.
  41. pre-calculus

    The best way to check is to substitute your answer back into the equation. SQRT(2x+1)-5=8 SQRT( (2*84)+1)-5=8 SQRT(168+1)-5=8 SQRT(169)-5=8 13 - 5 = 8 8 = 8 You are correct!
  42. Math

    Adding the items gives $460 The tax on that at 5.5% =0.055*$460 =? Add the tax to the cost of the items. That value is one of the choices given.
  43. College Math

    -5+2*SQR(12) =-5+2*SQR(4*3) =-5+2*SQR(4)*SQR(3) =-5+2*2*SQR(3) =-5+4*SQR(3)
  44. College Math

    My Alt+251 keyboard did not post as a square root--reposting...
  45. College Math

    You got the right answer! It just needed to be reduced. -5 + 2*ã(12) =-5+2*ã(4*3) =-5+2*ã4 * ã3 =-5+2*2*ã3 =-5+4*ã3
  46. Physics for Engineers

    Check part b comments on your previous post.
  47. Physics

    Using that... Y=14.47m/s(2.2s)-(1/2)(9.8m/s)(2.2)^2 Y=31.834m - 23.716m =8.118m So it clears the wall by 8.118m - 6.7m =1.418m
  48. Physics

    I get 14.47m/s for Vy.
  49. Physics

    I calculated the ball was thrown at a speed of 18.12m/s. Vx is 24m/2.2s=10.91m/s Vx=V(cos(53)) That gives V as 18.12m/s
  50. Physics

    Sorry, I see that was given.
  51. Physics

    On part b, You need to find how long it takes the ball to go th 24.0m in the x direction. Use that time for the y calculation.
  52. algebra 2

    I believe Capreeca is wrong on this one. 2x+1=3 2x=2 x=1
  53. maths

    Please note that "ina"'s answer is wrong.
  54. Algebra

    Change the 31% to a decimal value. Then multiply both sides of the equation by Q. Then get all the Q terms on one side and the number terms on the other side. Combine the terms and solve for Q.
  55. Geometry

    I think you made an error in adding the angles. In your problem angles are x, 3x, and 4x. Adding those gives 8x not 7x. Does that help?
  56. Algebra 1

    let J=Jim's age let D=Dave's age It is given that Dave can vote. So D>=18 Dave is 5 years older J+5=D or J=D-5 Jim can't vote. J<18 Substitute for Jim's age: D-5<18 Solve this for the upper limit for Dave's age.
  57. algebra 1

    Sorry the next to last line should say to express LENGTH as a function of W. Then, solve for W.
  58. algebra 1

    What does the problem say: Perimeter is less than 48ft. Let P=perimeter Let L=length Let W=width P<48ft Express perimeter in terms of length and width: P=L+W+L+W or L+W+L+W<48ft Express the width as a funtion of L. Substitute that value into the above equation and solve ...
  59. physics

    Yes, that is correct. I would really encourage you to carry the units through from start to finish. It seems like extra work, but it can help detect errors.
  60. math

    Yes, you are correct!
  61. math

    type LCM, least common multiple
  62. math

    I think 72 is the LCM, least common multile, not GCF, greatest common factor.
  63. Algebra

    Add 4 to both sides. Then, square both sides. Does that help?
  64. Pre-algebra

    To clarify: (-4)^4 is not equal to -256.
  65. Pre-algebra

    -256 is not the correct answer.
  66. math

    Yes! All answers are correct. Note that answer 4 could be reduced to 19/30 hours.
  67. math

    BUBBA's answers start with a wrong answer.
  68. Algebra 2

    Correcting typo The line 5 = H = 1 shoud read: 5 = H - 1
  69. Algebra 2

    My error I just reread that the first 1/2 hour is included. I am quite sure that the it is $30 for each additional 1/2 hour the equation is: Let H = the number of HALF HOURS $200 = $50 + (H-1))$30 similarly $150 = (H-1)*$30 5 = H=1 adding 1 to each side: H= 6 This is the ...
  70. Algebra 2

    I think there is some confusion here. Let H = the total hours $200 = $50 + (H-1)*$30 Remember that the first hour is included in the $50. subtract $50 from both sides $150 = (H-1)*$30 divide both sides by $30 5 = H -1 add 1 to both sides: H = ??
  71. Algebra B

    You are very welcome.
  72. Algebra B

    You're welcome, but I am not sure what you mean by reverse FOIL. First terms: x and x Outer terms: x and -5/4 Inner terms: -5/4 and x Last terms : -5/4 and -5/4 I just want to be sure you have a good understanding about the order.
  73. Algebra B

    OK, (x-5/4)^2 = (x-5/4)(x-5/4) multiplying (remember FOIL--first, outer, inner, last) = x^2 -(5/4)(x) - (5/4)(x) + (5/4)^2 = x^2 - (10/4)(x) + (5^2)/(4^2) = x^2 -(5/2)(x) + (25)/(16) Does that help?
  74. Algebra B

    Which side (left or right) is puzzling?
  75. Physics

    Be careful of units. You expressed the runway length in m (meters), but the takeoff speed is expressed in mi/h (miles/hour). You will need to do some units conversion.
  76. computer architecture

    Modern PCs have a word size of 32 or 64 bits. Early IBM PCs used an Intel 8088 which had an 8 bit data path.

    my misspelling... You have AN eror.

    You have and error. 3X + 240 + 36X = 6 39X = -234 X = ?
  79. Physics

    You are very welcome!
  80. Physics

    Since the moments were calculated from the end the fisherman is holding in his left hand, that force does not generate any moment.
  81. Physics

    Assuming the fishing pole is horizontal... Yes, the fisherman's left hand is exerting a downward force. You are correct.

    You're welcome. Glad to help

    6 is correct. However, your last step is not quite correct. starting with... 20x + 10 - 10 = 130 - 10 20x = 120 Now divide both sides by 20, not 20x 20x/20 = 120/20 x = 6
  84. math

    Yes, that answer is correct.
  85. Physics

    You are headed in the right direction. That is a distance formula when there is uniform acceleration which is gravity in this problem. The formula is: s2 = s1 + vt + (1/2)(a)t^2 where: s2 = final distance s1 = initial distance v = initial velocity a = acceleration t = total ...
  86. Physics

    How are you solving it? What answer are you getting?
  87. Algebra

    Your welcome! Glad to help
  88. Algebra

    Yes, you got it!
  89. Algebra

    Close... You have the inequality correct, but when you divided both sides by -4, you you have an error on the right side. 6/(-4) = ?
  90. Algebra

    -4x + 1 >= 7 Solve this as you would if there was just an "=" sign. But, anytime you multiply or divide both sides by a negative number the inequality sign will reverse. To get you started... Subtract 1 from both sides.
  91. algebra

    1. Make sure the equation is in the form: ax^2 + bx + c = 0, which your problem is. 2. Use the quadratic formula: x1 = (-b + (b^2 - 4ac)^(1/2))/(2a) x2 = (-b - (b^2 - 4ac)^(1/2))/(2a) You can check your answers by substituting into the original equation.
  92. algebra1

    The problem says the hours will always be over 20. The charge for the first 20 hours is $9.95. All the hours after 20 are $0.50 each. h = total monthly hours cost = $9.95 + (h - 20)x $0.50 Plug in 35 for h and what do you get?
  93. math

    Be cautious about units on this problem. The problem gives the distance in feet. Gravitational acceleration in English units is about 32 ft/sec^2 .
  94. calculus

    You got it! Glad to help.
  95. calculus

    Sorry, my error... I went the wrong way! Your exponent and coefficient are wrong.
  96. calculus

    The exponent is correct, but the coefficient is not 1. If you take the derivative of your answer do you get x^4?
  97. math

    Retyping last lines... What is 10% of the new larger salary? Subtract that to find what your salary is after the 10% cut.
  98. math

    What is 10% of $90,000? Add that to $90,000 to find your salary after the raise. What is %10 of the new larger salary? Substract that to find what your salary is after the %10 cut.
  99. algebra word problem

    r-5 being negative results in a negative t2 and so should be ignored.
  100. algebra word problem

    You are practically there! Combine terms and rearrange to get into the form: 4r^2 -90r + 275 = 0 Use the quadratic formula to find r. There will be two answers. One of the answers is the result if the canoeist reverses direction (r-5 is negative).
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