Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

lala2 Group Title

.

  • one year ago
  • one year ago

  • This Question is Closed
  1. Euler271 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    law of cosines: \[c^2 = a^2 + b^2 - 2abcos(\theta)\] c is the longest side, notice that pythagoras' is the special case of law of cosines, where theta = 90. \[165^2 = 83^2 + 111^2 - 2(83)(111)\cos(\theta)\]

    • one year ago
  2. Euler271 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    you end up with: cos(theta) = 0.434983175 so with your calculator, use the cos^(-1) button on 0.434983175 (cos inverse) to get the obtuse angle: 64.2 degrees the direction north of west would be 180 degrees - 64.2 degrees

    • one year ago
  3. lala2 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    @Euler271 ??

    • one year ago
  4. lala2 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    @phi ?

    • one year ago
  5. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes

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

    Re-reading the question, they want the angle "degrees North of West"

    • one year ago
  7. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1369857679392:dw|

    • one year ago
  8. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Euler lost a minus sign the angle you want plus 115.8 add up to a straight line

    • one year ago
  9. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    answer + 115.8 =180 solve for answer

    • one year ago
  10. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I would add -115.8 to both sides

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

    yes, the ship was heading west (270 degrees) and it turned 64.2º toward the north.

    • one year ago
    • Attachments:

See more questions >>>

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.