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anonymous

  • one year ago

help plz

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  1. anonymous
    • one year ago
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    The coordinates A(0, 0), B(0, 5) and C(3, 0) are graphed and connected together. What 3-dimensional shape will be created when this shape is rotated about the y-axis? Provide an explanation and proof for your answer to receive full credit.

  2. anonymous
    • one year ago
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    @yoongi

  3. anonymous
    • one year ago
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    help plz

  4. nerdyotter
    • one year ago
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    A great tool for graphing this would be Desmos, if you haven't already used it. It should be able to help you visualize what the pre-image of the shape (before rotation) will look like. https://www.desmos.com/calculator

  5. anonymous
    • one year ago
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    can u still help me

  6. nerdyotter
    • one year ago
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    It looks like the shape's pre-image will be a triangle with the right angle at the origin. What would happen if you rotated this shape 360 degrees?

  7. nerdyotter
    • one year ago
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  8. anonymous
    • one year ago
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    i will be a cone

  9. anonymous
    • one year ago
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    it

  10. nerdyotter
    • one year ago
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    Correct!

  11. anonymous
    • one year ago
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    thanks

  12. nerdyotter
    • one year ago
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    No problem!

  13. anonymous
    • one year ago
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    i have 2 more question if you dont mind

  14. nerdyotter
    • one year ago
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    I'll answer them the best I can.

  15. anonymous
    • one year ago
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    Which of these countries has the greatest population density? Which has the least? Provide an explanation and proof for your answer to receive full credit.

  16. anonymous
    • one year ago
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    Country Population (1997 estimate) Area (square km) U.S. 272,648,000 9,364,520 Romania 22,609,000 237,391 Ghana 18,339,000 237,533

  17. nerdyotter
    • one year ago
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    I guess I'm just not really sure what that question is trying to ask.

  18. anonymous
    • one year ago
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    Country Population Area square km) U.S. 272,648,000 9,364,520 Romania 22,609,000 237,391 Ghana 18,339,000 237,533

  19. anonymous
    • one year ago
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    is that a better chart

  20. anonymous
    • one year ago
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    Which of these countries has the greatest population density? Which has the least? Provide an explanation and proof for your answer to receive full credit

  21. nerdyotter
    • one year ago
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    I'm assuming it's asking you to find the number of people per square kilometer. I'm not ENTIRELY sure what to do here, but I'm assuming you could simply divide the population by the number of square kilometers (the area) to get that information.

  22. anonymous
    • one year ago
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    okk

  23. nerdyotter
    • one year ago
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    For example, the US would be 272,648,000 / 9,364,520 = 29.115.

  24. anonymous
    • one year ago
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    ok

  25. anonymous
    • one year ago
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    the last question

  26. anonymous
    • one year ago
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    Pyramid A is a square pyramid with a base side length of 14 inches and a height of 6 inches. Pyramid B has a volume of 3,136 cubic inches. How many times bigger is the volume of pyramid B than pyramid A? Give your answer as a percent. Provide an explanation and proof for your answer to receive full credit.

  27. nerdyotter
    • one year ago
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    Do you know how to calculate the volume of a square pyramid?

  28. anonymous
    • one year ago
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    V=bh1/3 i believe

  29. nerdyotter
    • one year ago
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    The formula is \[\frac{ 1 }{ 3 } b ^{2} h\] or \[b ^{2} \frac{ h }{ 3 }\] Knowing this, what would you get for the volume of the first square pyramid?

  30. anonymous
    • one year ago
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    14^3 6/3

  31. anonymous
    • one year ago
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    v=1372

  32. nerdyotter
    • one year ago
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    That's b squared, not b cubed.

  33. anonymous
    • one year ago
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    ok hold up let me add it again

  34. anonymous
    • one year ago
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    v=98

  35. nerdyotter
    • one year ago
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    I think you're getting caught up somewhere in the calculation. Let's take this step by step.

  36. anonymous
    • one year ago
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    14*14=196 6/3=2 196/2=98

  37. nerdyotter
    • one year ago
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    \[b ^{2} \frac{ h }{ 3 }\] \[14^{2} \frac{ 6 }{ 3 }\] \[196(\frac{ 6 }{ 3 }) = ? ^{3}\]

  38. nerdyotter
    • one year ago
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    Ah, you're making the mistake of dividing 14 squared by six thirds instead of multiplying them.

  39. anonymous
    • one year ago
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    ook

  40. anonymous
    • one year ago
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    v=392

  41. nerdyotter
    • one year ago
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    Good! :) Now, to calculate percent change, you would start by finding the difference between the two volumes (or the increase). The formula to find the increase is... \[Increase = New - Old\]

  42. nerdyotter
    • one year ago
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    In this case, it would be Pyramid B - Pyramid A.

  43. nerdyotter
    • one year ago
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    Er, I apologize. The other way around, I believe.

  44. anonymous
    • one year ago
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    3,136-392= 2744

  45. anonymous
    • one year ago
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    ^^

  46. nerdyotter
    • one year ago
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    Then, the formula to find percent change is \[change = (\frac{ increase }{ original })(100)\]

  47. anonymous
    • one year ago
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    2744 2744/3136 (100)

  48. anonymous
    • one year ago
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    87.5% is that correct

  49. anonymous
    • one year ago
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    @nerdyotter is this correct

  50. anonymous
    • one year ago
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    before u leave

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