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

.

  • 10 months ago
  • 10 months ago

  • This Question is Closed
  1. Euler271
    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. \[165^2 = 83^2 + 111^2 - 2(83)(111)\cos(\theta)\]

    • 10 months ago
  2. Euler271
    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

    • 10 months ago
  3. lala2
    Best Response
    You've already chosen the best response.
    Medals 1

    @Euler271 ??

    • 10 months ago
  4. lala2
    Best Response
    You've already chosen the best response.
    Medals 1

    @phi ?

    • 10 months ago
  5. phi
    Best Response
    You've already chosen the best response.
    Medals 1

    yes

    • 10 months ago
  6. phi
    Best Response
    You've already chosen the best response.
    Medals 1

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

    • 10 months ago
  7. phi
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1369857679392:dw|

    • 10 months ago
  8. phi
    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

    • 10 months ago
  9. phi
    Best Response
    You've already chosen the best response.
    Medals 1

    answer + 115.8 =180 solve for answer

    • 10 months ago
  10. phi
    Best Response
    You've already chosen the best response.
    Medals 1

    I would add -115.8 to both sides

    • 10 months ago
  11. phi
    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.

    • 10 months 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.