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DochEvi [55]
3 years ago
13

2. Write an expression to represent f (20)

Mathematics
1 answer:
Furkat [3]3 years ago
7 0

Answer:

I just learned this topic and have the same question, so I'm not sure if this right. However, I see a fellow student struggling and have to at least put in what I know. My equation was f(n) = 64(1/2)^n-1, then the question was write an expression to represent f(20).

Step-by-step explanation:

So, my answer was f(20) = 64(1/2)^19

f(20) is the number you plug into n. And because the exponent is n-1, I knew to subtract 1 from 20 to get 19.

Then I just wrote the equation out like the original expect with the numbers pluged in: f(20) = 64(1/2)^19

I hope this helps!

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here, 7 cellphone,9 Tv, 12airconditioners = 8723

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or, 7,9,12=8723

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2,2,3=2191

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solved by

<h3> pratik</h3>

6 0
3 years ago
Five years ago I was 5 times older than my son. In 8 years’ time I will be 3 times older than my son. How old am I today?
o-na [289]

Let x = Parent's age now  y = son's age now

Then, x-5 = parent's age five years ago

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We have the system of equations:  x - 5y = -20

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Subtract the equations to obtain -2y = -36

                                                  y = 18

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Parent is 70 years old and the son is 18 years old.  

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