Answer:
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
<u>Algebra I</u>
- Slope Formula:
Step-by-step explanation:
<u>Step 1: Define</u>
Point (5, 6)
Point (7, -2)
<u>Step 2: Find slope </u><em><u>m</u></em>
- Substitute [SF]:
- Subtract:
- Divide:
Answer:
It is 725/1000.
Step-by-step explanation:
The fraction can be simplified but that will result in a loss of information about its accuracy.
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Let x be the cost of each book.
So, the cost of 4 books is 4x.
For the purchase of 4 books, he got a discount of $20.
So, the amount he paid for the first four books = 4x - 20.
Now, the cost of 5 books is 5x.
For the purchase of 5 books, he got another discount of $5.
So, the amount he paid for the five books = 5x - 5.
Total money spent = $87.
Therefore, (4x - 20) + (5x - 5) = 87
4x + 5x - 20 - 5 = 87
9x - 25 = 87
9x = 87 + 25
9x = 112
Divide both sides by 9.
x = 12.4
Hence, the cost of each book = $12.4.
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