can anyone help me??? please!!!!

- anonymous

can anyone help me??? please!!!!

- schrodinger

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- anonymous

Julie is at the store buying groceries. She needs to get a quart of orange juice and some peaches. The quart of orange juice costs $2.25 and the peaches are $0.75 each. The function f(x) = 0.75x + 2.25 represents Julie's expenses at the grocery store. What do the f(x) and the x represent?

- anonymous

A:f(x) represents the number of items purchased at the grocery store; x represents the number of peaches purchased
B:f(x) represents the total cost of the grocery bill; x represents the cost per peach
C: f(x) represents the number of items purchased at the grocery store; x represents the cost per peach
D: f(x) represents the total cost of the groceries; x represents the number of peaches purchased

- anonymous

Orange juice cost $2.25 right?
and Peaches are 0.75 which is 75 cents
the word "each" is how many.

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## More answers

- anonymous

If she buys 1 peach it is 75 cents
2 peaches is $1.50
3 peaches is $2.25

- anonymous

so would it be D

- anonymous

Yes, it is.
Nice job.

- anonymous

thank you but can you help me with another question? @shalante

- anonymous

Yes.

- anonymous

Which of the following exponential functions goes through the points (1, 6) and (2, 12)?

- anonymous

f(x) = 3(2)x
f(x) = 2(3)x
f(x) = 3(2)−x
f(x) = 2(3)−x

- anonymous

2. The balance in two separate bank accounts grows each month at different rates. The growth rates for both accounts are represented by the functions f(x) = 2x and g(x) = 4x + 12. In what month is the f(x) balance greater than the g(x) balance?

- anonymous

can you write the choices in draw mode?

- anonymous

what do you mean

- anonymous

|dw:1439596152736:dw|
like this.

- anonymous

|dw:1439596167634:dw|

- anonymous

sorry for the bad writing

- anonymous

Do this first: \[(a)^b \],
then multiply the outside.

- anonymous

how do i do that?

- anonymous

Plug in the 1 from (1,6) and 2 from (2,12) and see if it matches.

- anonymous

like do you want me to do slope formula

- anonymous

So replace the x with 1 to see if it equals to 6
replace the x with 2 to see if it equals to 12
No, read your question again.

- anonymous

You told me to help you with another problem and you posted 2 more.
Only one at a time please.
It is confusing...

- anonymous

ok wait

- anonymous

I would help you one problem at a time.
So one by one.

- anonymous

ok they match

- anonymous

- anonymous

Which particular one?

- anonymous

f(x)=3(2)^x

- anonymous

Yes that is correct.
Nice!

- anonymous

so would that be the answer @Shalante

- anonymous

Yes, it is the only one that goes through (1,6) and (2,12)

- anonymous

what about the 3rd question how do solve it

- anonymous

is there a graph of it?

- anonymous

no there is no graph just multiple choice:
Month 6
Month 5
Month 4
Month 3

- anonymous

just letting you know 2x is
\[2x\]
and 2^x is \[2^x\]

- anonymous

so is \[f(x)=2^x\]

- anonymous

so what would i have to do??????? @Shalante

- anonymous

write me the f(x) and g(x) equation on the word problem.

- anonymous

f(x) = 2x and g(x) = 4x + 12.

- anonymous

for the second problem, you wrote the equation wrong, so I asked you to draw it out.
I am sure you wrote down the function to the 3rd problem (word problem) wrong also
Did you see your mistake for the second problem you wrote down earlier?

- anonymous

no

- anonymous

You wrote down 3(2)x for the first choice. It is supposed to be 3(2)^x
You see the arrow between 2 and x. That represents the x is going up making it an exponent.

- anonymous

yea i see that now

- anonymous

3(2)x is 3 times 2x
3(2)^x is \[3(2)^x\]

- anonymous

the 3rd problem is saying at what x is f(x)=2x greater than g(x)=4x+12
f(x) can never be greater than g(x). You probably wrote the equation wrong..

- anonymous

Probably forgot exponent sign.

- anonymous

yea i wrote that wrong

- anonymous

ill rewrite the 3rd question

- anonymous

The balance in two separate bank accounts grows each month at different rates. The growth rates for both accounts are represented by the functions f(x) = 2x and g(x) = 4x + 12. In what month is the f(x) balance greater than the g(x) balance?

- anonymous

- anonymous

Still does not make sense -_-
Can you write f(x) and g(x) in draw mode

- anonymous

|dw:1439597961464:dw|

- anonymous

for f(x) 2 has an exponent of x and g(x) does not have an exponent of x

- anonymous

Look at the f(x) between your draw mode and what you wrote. You did not see your mistake..

- anonymous

Remember the rules I told you when writing an exponent.
Now write f(x) without draw mode.

- anonymous

this time i wrote it exactly how the question gave it to me

- anonymous

Now write f(x) without draw mode.

- anonymous

do you think you can just help me because i am taking an exam

- anonymous

I am helping. You are not paying attention.

- anonymous

Scroll back up and read everything I wrote again until you understand.

- anonymous

ok nevermind i found the answer but thanks anyways

- anonymous

No problem!

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