Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

yeah_i_suck_at_math

  • one year ago

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

  • This Question is Closed
  1. yeah_i_suck_at_math
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    my answer is A

  2. BillBell
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[x + 5 = +/- \sqrt{35}\] 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.

  3. kym02
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I got A too but i'm not sure

  4. BillBell
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    That's what I get too.

  5. yeah_i_suck_at_math
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah its A, thanks guys, can you help me on another question, its harder than this one

  6. BillBell
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    go ahead

  7. kym02
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    sure

  8. yeah_i_suck_at_math
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    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.

  9. yeah_i_suck_at_math
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    my answer is C

  10. yeah_i_suck_at_math
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    or B, not sure though

  11. BillBell
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  12. yeah_i_suck_at_math
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so it was B

  13. BillBell
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    So it appears.

  14. yeah_i_suck_at_math
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    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

  15. BillBell
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Back in a few minutes ...

  16. BillBell
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[( x - p)^{2} = x^{2} - 2p + p ^{2}\] 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.

  17. yeah_i_suck_at_math
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah i already finished this question but thanks

  18. yeah_i_suck_at_math
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    will you help me on a new question please ? @BillBell

  19. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.