Hi I'm reviewing the following solution in my trigonometry text book and I can't figure out how they got their answer. If someone can help explain how they calculated 542.25 for a^2 (nothing I do comes up with that number):

a2=(16)^2+(11)^2 -2(16)(11)Cos118

Thank you!

  1. 👍 0
  2. 👎 0
  3. 👁 47
asked by Amy
  1. I got exactly that.

    a^2= 16^2 + 11^2 - 2(16)(11)cos118°
    = 256 + 121 - 352(-.469471562)
    = 377 + 165.2539898
    = 542.253989
    a = √542.2539898
    = 23.2863

    Are you following the order of operation?

    1. 👍 0
    2. 👎 0
    posted by Reiny
  2. Thank you, I think it was how I was using my calculator. I didn't add brackets, now I got the same too. Very helpful to have that extra confirmation, I can't tell you how long I've been stuck on this question. Thanks a million!

    1. 👍 0
    2. 👎 0
    posted by Amy

Respond to this Question

First Name

Your Response

Similar Questions

  1. Algebra Help

    I have a question regarding this problem below? I noticed it in an eariler post, and have come to figure that my text book has it like this? What would be the solution for this? x+sqrt(11-x)= 5 x = 2? OR 2,7? OR NO solution? I say

    asked by Robert on August 3, 2009
  2. English

    Hi! Need some advice.Next week I need to teach a class. My task is to find a text (I have found it,it's a german literature)and now I need to do something with this text and it needs to last for 45-60 minutes.It shouldn't be just

    asked by laxy on April 13, 2009
  3. Language Arts

    I left my McMillian text book for language arts in school today and I have homework on page 2 and 3. I'm in the 6th grade does anyone have that book. I really really need those questions. I don't know if this gives page numbers

    asked by Tatyana on September 11, 2006
  4. math

    Book 1 255 book 2 235 book 3 178 book 4 299 book 5 150 book 6 67 book 7 82 book 8 267 book 9 188 book 10 142 book 11 281 book 12 138 book 13 326 book 14 264 book 15 103 ^ number of pages What would be the best graph or display to

    asked by :I on April 30, 2017
  5. SCI275

    Air Pollution Chart: After reviewing Ch. 8 and 9 of your text, complete the following table, then respond to the questions that follow:

    asked by anonymous on February 2, 2009
  6. High School Courses

    How often do state colleges which are moderately competitive require trigonometry? Is trigonometry something like algebra that they expect you to have, or do they usually not care as long as you have the right number of math

    asked by Evelyn on March 31, 2009
  7. Literature Question

    I have this question on a homework assignment and I am confused! It is not wise to rely on the__________ to determine whether a stereotype exsists in a book. (Here are the choices the assignment gives me to complete the sentence)

    asked by Rachel on February 4, 2007
  8. chemistry

    in my text book it says that if the calculated value is less than or equal to 0.1 then the color of the conjugate base (In- in this case) predominates. does this mean that the solution will be yellow then?

    asked by George on July 18, 2010
  9. chem

    how many milliter of .246 M HNO3 should be added to 213 ml of 0.00666 M 2,2'-bipyridine to give a pH of 4.19? please help, does this problem need to be solved with ka or kb?. Is 2,2'- bipyridine a base, this is the problem from my

    asked by bun on February 2, 2010
  10. microsoft office aplication-computers

    what is an advantage of inputting text on a slide via a text in powerpointx a )any font can be selected within a text box b)text within a text box can be formatted by color or style c)you can position the text anywhere on the

    asked by vedrana on November 22, 2011

More Similar Questions