A teacher has four books-A, B, C, and D-to assign to four students in any order he prefers. Set S includes all possible arrangements of the four books.
Set X includes all possible arrangements when book C is chosen first and D is chosen second.
Which notation is correct? с
If book C is chosen first and D is chosen second, in how many ways can the teacher assign the books?

Demonstrate the proof of your new polynomial identity through an algebraic proof and a numerical proof in an engaging way! make it so the whole world wants to purchase your polynomial identity and can't imagine living without it! you must: label and display your new polynomial identity prove that it is true through an algebraic proof, identifying each step demonstrate that your polynomial identity works on numerical relationships create your own using the columns below. see what happens when different binomials or trinomials are combined. square one factor from column a and add it to one factor from column b to develop your own identity. column a column b (x − y) (x2 + 2xy + y2) (x + y) (x2 − 2xy + y2) (y + x) (ax + b) (y − x) (cy + d)

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Choose the more precise measurement. 26.4 cm or 8.39 cm