A28 foot ladder leaning against a building forms a 15 degree angle with the side of the building. how y’all is the building?

What is the probability of drawing three queens from a standard deck of cards, given that the first card drawn was a queen? assume that the cards are not replaced.

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

How is this equation completed? i cannot find any examples in the book.