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yeah_i_suck_at_math Group Title

If (x + 5)^2 = 35, what is the approximate positive value of x? 0.92 2.65 3.16 5.48

  • 5 months ago
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  1. yeah_i_suck_at_math Group Title
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    my answer is A

    • 5 months ago
  2. BillBell Group Title
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    \[x + 5 = +/- \sqrt{35}\] Question asks for the positve value of x. So we have \[x = -5 + \sqrt{35}\] because \[x = -5 - \sqrt{35}\] is negative. You can use a calculator or google to get the approximate value of this.

    • 5 months ago
  3. kym02 Group Title
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    I got A too but i'm not sure

    • 5 months ago
  4. BillBell Group Title
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    That's what I get too.

    • 5 months ago
  5. yeah_i_suck_at_math Group Title
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    yeah its A, thanks guys, can you help me on another question, its harder than this one

    • 5 months ago
  6. BillBell Group Title
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    go ahead

    • 5 months ago
  7. kym02 Group Title
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    sure

    • 5 months ago
  8. yeah_i_suck_at_math Group Title
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    Debbie sells cookies and hotdogs. The daily cost of making cookies is $460 more than the difference between the square of the number of cookies sold and 20 times the number of cookies sold. The daily cost of making hotdogs is modeled by the following equation: C(x) = 2x2 - 80x + 1,200 C(x) is the cost in dollars of selling x hotdogs. Which statement best compares the minimum daily cost of making cookies and hotdogs? It is greater for hotdogs than cookies because the approximate minimum cost is $300 for cookies and $392 for hotdogs. It is greater for hotdogs than cookies because the approximate minimum cost is $360 for cookies and $400 for hotdogs. It is greater for cookies than hotdogs because the approximate minimum cost is $400 for cookies and $360 for hotdogs. It is greater for cookies than hotdogs because the approximate minimum cost is $392 for cookies and $300 for hotdogs.

    • 5 months ago
  9. yeah_i_suck_at_math Group Title
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    my answer is C

    • 5 months ago
  10. yeah_i_suck_at_math Group Title
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    or B, not sure though

    • 5 months ago
  11. BillBell Group Title
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    dC(x)/dx = 2x - 20 = 0 => x = 10 => minimum cost of cookies = 460 + 10^2 - 20(10) = 360 dH(x)/dx = 4x - 80 = 0 => x = 20 => minimum cost of hotdogs = 1200 + 2(20^2) - 80(20) = 400

    • 5 months ago
  12. yeah_i_suck_at_math Group Title
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    so it was B

    • 5 months ago
  13. BillBell Group Title
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    So it appears.

    • 5 months ago
  14. yeah_i_suck_at_math Group Title
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    ok and last one .. A quadratic equation is shown below: x2 - 8x + 13 = 0 Which of the following is the first correct step to write the above equation in the form (x - p)2 = q, where p and q are integers? Subtract 5 from both sides of the equation Subtract 3 from both sides of the equation Add 5 to both sides of the equation <-- my answer Add 3 to both sides of the equation

    • 5 months ago
  15. BillBell Group Title
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    Back in a few minutes ...

    • 5 months ago
  16. BillBell Group Title
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    \[( x - p)^{2} = x^{2} - 2p + p ^{2}\] Compare the equation you have been given with this one. Then -2p = -8 and therefore p =4. With this value of p we get \[x^{2} - 8x + 16\] and we want to make the original equation into this so we subtract 3 from both sides.

    • 5 months ago
  17. yeah_i_suck_at_math Group Title
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    yeah i already finished this question but thanks

    • 5 months ago
  18. yeah_i_suck_at_math Group Title
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    will you help me on a new question please ? @BillBell

    • 5 months ago
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