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anonymous

  • 5 years ago

ok what is 14. Solve the area formula for a trapezoid, , for .

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  1. anonymous
    • 5 years ago
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    it is A=1/2h(b1+b2)for b1

  2. anonymous
    • 5 years ago
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    A=0.5*h*(b1+b2) 2A/h=b1+b2 b1=2A/h-b2

  3. anonymous
    • 5 years ago
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    what?

  4. anonymous
    • 5 years ago
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    Well, from your partially written out question, I assumed you want to solve the trapezoid formula for b1.

  5. anonymous
    • 5 years ago
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    no that is the question that my techer gave me

  6. anonymous
    • 5 years ago
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    So what is your question?

  7. anonymous
    • 5 years ago
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    14. Solve the area formula for a trapezoid, , for . (2 points) b1 = 2Ah – b2 1.b1= 2Ahb2 2.b1=2A/hb1 3.b1=1/2ahb1 4.b1= 2Ahb2 wech wo is rifgt

  8. anonymous
    • 5 years ago
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    i mean right

  9. anonymous
    • 5 years ago
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    None of them are right...

  10. anonymous
    • 5 years ago
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    yes i got it it is b1=AH-b2

  11. anonymous
    • 5 years ago
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    i mean it hase to be

  12. anonymous
    • 5 years ago
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    Why? Try going from that back to the area formula for a trapezoid.

  13. anonymous
    • 5 years ago
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    ok

  14. anonymous
    • 5 years ago
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    i got b2=1/2hb1a

  15. anonymous
    • 5 years ago
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    Write out your steps? I swear you need a subtraction in there somewhere.

  16. anonymous
    • 5 years ago
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    me to

  17. anonymous
    • 5 years ago
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    b1= 1/2AH-b2

  18. anonymous
    • 5 years ago
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    i do not get any of it

  19. anonymous
    • 5 years ago
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    can you help

  20. anonymous
    • 5 years ago
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    hey taking a look

  21. anonymous
    • 5 years ago
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    so what was given was the first line? b1 = 2Ah – b2

  22. anonymous
    • 5 years ago
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    14. Solve the area formula for a trapezoid

  23. anonymous
    • 5 years ago
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    ah ok so this is the formula of the trapazoid? t is A=1/2h(b1+b2)for b1

  24. anonymous
    • 5 years ago
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    2A = 1/2h(b1+b2)

  25. anonymous
    • 5 years ago
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    err sorry 2A/h = b1+ b2

  26. anonymous
    • 5 years ago
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    b1 = 2A/h - b2

  27. anonymous
    • 5 years ago
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    but how

  28. anonymous
    • 5 years ago
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    that is what i do not get

  29. anonymous
    • 5 years ago
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    ok so 1. A=1/2h(b1+b2) 2. A = h/2(b1 + b2) (another way to write 1/2h is h/2)

  30. anonymous
    • 5 years ago
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    now we want to multiply both sides by 2

  31. anonymous
    • 5 years ago
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    and we get 3. 2A = h(b1 + b2)

  32. anonymous
    • 5 years ago
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    now we want to divide both sides by h, to get rid of the h - the whole point here is trying to get b1 by itself - so we continuously perform the same operation to both sides of the equation until it's alone - since if you do the same thing be it multiple, divide, or add to both sides, you still have a valid equation

  33. anonymous
    • 5 years ago
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    so 2A/h = h(b1+b2)/h

  34. anonymous
    • 5 years ago
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    and since we know h/h = 1, we can get rid of h on the right side

  35. anonymous
    • 5 years ago
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    so 2A/h = b1+b2

  36. anonymous
    • 5 years ago
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    so now, to get b1 by itself, we need to subtract b2 from both sides

  37. anonymous
    • 5 years ago
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    so 2A/h - b2 = b1+b2-b2

  38. anonymous
    • 5 years ago
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    that eliminates the b2 on the right side, and leaves b1 alone

  39. anonymous
    • 5 years ago
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    oh ok

  40. anonymous
    • 5 years ago
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    sp 2A/h - b2 = b1, or b1 = 2A/h - b2

  41. anonymous
    • 5 years ago
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    ok i am starting to get it

  42. anonymous
    • 5 years ago
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    but as far as the options go on your multiple choice - I don't see any that match

  43. anonymous
    • 5 years ago
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    ok i will contact my techer

  44. anonymous
    • 5 years ago
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    tomorrow

  45. anonymous
    • 5 years ago
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    ok sorry =(

  46. anonymous
    • 5 years ago
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    you could try inputting different values for b1 and b2

  47. anonymous
    • 5 years ago
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    and h

  48. anonymous
    • 5 years ago
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    and see which answer matches the from the choices and the original equation

  49. anonymous
    • 5 years ago
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    ok

  50. anonymous
    • 5 years ago
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    but I would do it with our answer first

  51. anonymous
    • 5 years ago
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    and see if they match up to the original area equation

  52. anonymous
    • 5 years ago
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    if different values of b1,h, and b2 are always equal for our answer, it's almost certianly correct

  53. anonymous
    • 5 years ago
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    and yeah, ask your teacher. worst case we're wrong and you have bonus points

  54. anonymous
    • 5 years ago
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    ok that would be cool lol

  55. anonymous
    • 5 years ago
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    thx for helping me

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