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Aleks [24]
3 years ago
9

If f(1)=6 and f(n)=-5f(n-1)-4 then find the value of f(5)

Mathematics
1 answer:
irakobra [83]3 years ago
8 0

Answer:

3126

Step-by-step explanation: f(1)=6 and f(n)=5f(n-1)-4. This means that next number is 5 times previous number minus 4.

f(2)=5f(1)-4 =5x6-4 = 30-4 = 26

f(3)=5f(2)-4 =5x26-4 = 130-4 = 126

f(4)=5f(3)-4 =5x126-4 = 630-4 = 626

f(5)=5f(4)-4 =5x626-4 = 3130-4 = 3126

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For a monthly cost of at least $7 and at most $8, you can have between 100 and 110 calling minutes.

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The problem states that the monthly cost of a celular plan is modeled by the following function:

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This can be solved by the following inequality:

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How many calling minutes are needed for a monthly cost of at most 8:

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