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anonymous

  • 5 years ago

Please help I don't understand this at all..... A right prism with a surface area of 82 square feet and a volume of 42 cubic feet; scale factor 1:2

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  1. anonymous
    • 5 years ago
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    Is that the entirety of the question?

  2. amistre64
    • 5 years ago
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    is a right prism just a cube?

  3. amistre64
    • 5 years ago
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    not if it scales to 1:2....got it ;)

  4. anonymous
    • 5 years ago
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    The solid described is similar to a large solid with the given scale factor. Find the surface area and volume of a larger solid

  5. amistre64
    • 5 years ago
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    the shape of the solid doesnt matter? or does it. a right prism can be anything as long as it is the same shape stacked up on top of itself.... or am I mistaken?

  6. amistre64
    • 5 years ago
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    the easies thing to do is to make it a rectangular prism...i think

  7. amistre64
    • 5 years ago
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    82/6 would be a square prism with 6 equal sides ...

  8. amistre64
    • 5 years ago
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    but that doesnt work out evenly

  9. amistre64
    • 5 years ago
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    Volume = l*w*h = 42 As = Area of faces

  10. amistre64
    • 5 years ago
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    im at a loss....sorry...

  11. amistre64
    • 5 years ago
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    maybe; 4 side + 2 bases = 82 that would still be a rectanule prism,,,,

  12. amistre64
    • 5 years ago
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    if it had square bases then 4wh + 2w = 82 would be simpler

  13. amistre64
    • 5 years ago
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    4wh + 2w^2 = 82 42 = w^2h h = 42/w^2 4(42/w) + 2w^2 = 82

  14. amistre64
    • 5 years ago
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    168/w + 2w^2 = 82 168 + 2w^3 = 82w 2w^3 -82w +168 = 0 2(w^3 - 41w + 84) = 0 w^3 - 41w + 84 = 0 is what I got so far if I did it right

  15. amistre64
    • 5 years ago
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    this just seems harder than what it should be called for :)

  16. amistre64
    • 5 years ago
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    and it looks like my w is going negative....... which doesnt bode well for my plans.....

  17. amistre64
    • 5 years ago
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    if we knew the original shape for the base of this right prism, id be better to calculate..... other than that....sorry

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