Suppose the amount of money in a bank account with an initial balance of $25,000 earns 1.5 percent interest per year. If the exponential function, y=A*B^X , is used to model this situation, which value would represent B in the function?

- anonymous

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- jamiebookeater

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- anonymous

Sorry I have so many questions. I'm taking an exam and I really want to get a good grade. I suck at math.

- anonymous

1.015 = B
1 for the original
0.15 for the interest

- Kash_TheSmartGuy

No direct answers!

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## More answers

- anonymous

Man you are a life saver. Do you think you could help me with another problem? And not give me the answer.

- Kash_TheSmartGuy

Read the "Terms and Conditions" and "Code of Conduct"

- anonymous

ok

- Kash_TheSmartGuy

^^ That was for @peachpi

- anonymous

@peachpi

- anonymous

Well can someone help please?

- anonymous

@Kash_TheSmartGuy it's kind of hard not to give a direct answer to that question. There's nothing to work out

- Kash_TheSmartGuy

Well, you can give them the formula or explanation of how you got the answer! Don't just give away answers!

- anonymous

what are you talking about? The question is asking him to pick out a number for use in a formula. And I gave a perfectly good explanation of how to do it

- anonymous

So can someone help please?

- anonymous

what's the question?

- anonymous

well its 2 actually

- anonymous

ok

- anonymous

ok so first question:
Which exponential function is best represented by this table?
x f(x)
0 2
1 6
2 18
3 54
answers:
f(x)=3(2)^x
f(x)=2(3)^x
f(x)=3(1/2)^x
f(x)=2(1/3)^x

- anonymous

|dw:1435278909112:dw|

- anonymous

got it?

- anonymous

Not really

- anonymous

the terms are the f(x) values. It's a sequence of numbers.
2, 6, 18, 54.
2 is the first term, 6 is the second term and so on

- anonymous

WE know a=2, so you just have to calculate r to get your function

- anonymous

|dw:1435279370768:dw|

- anonymous

you good on this one?

- anonymous

Im lost

- misssunshinexxoxo

Peachpi did an adequate job answering this; he did not give a direct answer and just did 2 out of his way; please be polite on OS.

- anonymous

was that directed towards me?

- anonymous

Im being polite I just dont get the problem

- misssunshinexxoxo

Was directed for kash

- misssunshinexxoxo

Answers look correct to me:)

- anonymous

y = ar^x is a general formula for an exponential function.
They're asking you to find a and r for the specific points in your table. You don't really need to worry about the x-values. Only look at the f(x) part of the table.
For exponential functions,
a = the first number on the f(x) side.
r = (2nd #)/(1st #) = (3rd #)/(2nd #) = (4th #)/(3rd #) → it's the same no matter which two consecutive numbers you use.

- anonymous

where'd you get get a and r from?

- anonymous

they're just constants. placeholders. you can use any two letters

- anonymous

you need a letter to hold the place of the constant until you find what it is. It's kind of like the how a
- quadratic function is y=ax²+bx+c
- a linear function is y = mx+b.
- Exponential functions are y = ar^x
The constants just represent part of the function

- anonymous

does that make any sense at all?

- anonymous

no its fine. Thank you for all of you help. ill just wing it based off what you gave me

- anonymous

this may help
https://www.khanacademy.org/math/algebra2/exponential_and_logarithmic_func/exp_growth_decay/v/exponential-growth-functions

- anonymous

Ok, thanks man

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