Stella is organizing textbooks on her bookshelf. She has an English textbook, a biology textbook, a physics textbook, and a writing textbook. How many different ways can she line the textbooks up on her bookshelf?

24 ways

Step-by-step explanation:

Books :

Physics = 1

English = 1

Biology = 1

Writing = 1

Total = (1 + 1 + 1 + 1) = 4 books

Number of ways of arrangement :

Total number of books! = 4!

4! = 4 * 3 * 2 * 1 = 24 different ways

the final amount you will pay is $68.04.

the tip is determined by the pre-tax amount, so we calculate the tip based on the original bill, not after we've added sales tax.

to find the tip:

we can divide 54.00 by 100 to get 1% of 54. then we multiply that by 18.

54 / 100 = .54

.54 x 18 = 9.72

tip = 9.72$

to find the tax:

we can divide 54.00 by 100 to get 1% of 54. then we can multiply that by 8 to get 8%.

54 / 100 = .54

.54 x 8 = 4.32

tax= 4.32

now we can add the tip and tax to the bill to get our total.

54 + 9.72 + 4.32 = 68.04

total: $68.04

step-by-step explanation: