Ellen ordered some books online. Each book cost $13 and there is a $20 shipping fee. Which expression represents the situation?
A 7n
B) 13n + 20
C) 33n
D) 20n + 13

Step-by-step explanation:

the correct expression is B

13*n+20

where n represents the number of the books

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐

the answer is a

step-by-step explanation: