What is the third quartile of the following data set 24 20 35 43 28 36 25 29 44 21 37

Evaluate cos2θ for cosθ = square root of 3/2

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.