1. Maths

    What is the value of cos225+sin165

    asked by Aliya on March 22, 2019
  2. Math

    Determine the exact value of: sin30° + cos225° + sin150° + cos330°

    asked by Kate on July 15, 2011
  3. Sogaduzela

    Simplify sin165.

    asked by Mfanvela on October 21, 2012
  4. Maths

    Cos255+sin165

    asked by Divya on March 4, 2019
  5. Algebra

    1)A bookshelf holds 4 mysteries, 3 biograpghies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book. A)1/2 B)1/6 C)5/6 D)3/50 I chose A 5

    asked by Jon on February 22, 2008
  6. Math

    1)Find the standard deviation of the data set to the nearest tenth. (21,13,18,16,13,35,12,8,15) A)16.8 B)7.8 C)7.3 D)5.7 I chose C mean = 21+13+18+16+13+35+12+8+15/9 16.8 variance = (21-16.8)^2 = 17.64...did that with the rest and added them to get sqrt

    asked by Jon on February 23, 2008