Susan sold half of her comic books and then bought 8 more She now has 13. How many did she begin with

Answer:

- 13

Step-by-step explanation:

f(1) = 7

f(n) = f(n − 1) – 4

f(₂) = f(1) – 4 = 7 - 4 = 3

f(₃) = f(₂) – 4 = 3 - 4 = -1

f(₄) = f(3) – 4 = (-1) - 4 = - 5

f(₅) = f(₄) – 4 = (- 5) - 4 = - 9

f(₆) = f(₅) – 4 = (- 9) - 4 =  - 13

Final answer:

The value of f(6) is -13, calculated based on the provided recursive formula where each term is four less than the previous.

Explanation:

We are given that f(1) = 7, and the recursive equation for n is f(n) = f(n − 1) – 4. Since the equation shows that each next term is four less than the previous one, we can calculate the following iterations:

• f(2) = f(2-1) - 4 = f(1) - 4 = 7 - 4 = 3
• f(3) = f(3-1) - 4 = f(2) - 4 = 3 - 4 = -1
• f(4) = f(4-1) - 4 = f(3) - 4 = -1 - 4 = -5
• f(5) = f(5-1) - 4 = f(4) - 4 = -5 - 4 = -9
• f(6) = f(6-1) - 4 = f(5) - 4 = -9 - 4 = -13

So, the value of f(6) is -13.

Learn more about Recursive Formulas here:

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Answer: so if C+M=S

You have to subtract selling price and markup to find the seller cost

Step-by-step explanation:

S=1770

M=130

C=1640

S-M=C

10% of 70 is 7.       I hope it helps.                                

10x = 70

divide both sides by 10.

x = 7

Therefore 10% of 70 is 7

Answer:

textual evidence

Step-by-step explanation: