A time traveler can take four books with him, and he has 86 books to choose from. How many different ways can the books be selected?

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

Refer to interactive solution 17.45 to review a method by which this problem can be solved. the fundamental frequencies of two air columns are the same. column a is open at both ends, while column b is open at only one end. the length of column a is 0.504 m. what is the length of column b?

Solve the system of equations y= 3/2 - 1, -x+ y =-3