HELP ME PLZ

- anonymous

HELP ME PLZ

- katieb

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- anonymous

why dont u use mathway.com it helps?!

- anonymous

i know how to do this but i don't know why i keep getting a wrong answer?

- anonymous

okay what did u get....go step by step.?

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## More answers

- anonymous

i got this 1.5159=(4+r)^(44)

- anonymous

hold on lemme see...

- anonymous

i think its 3.8

- anonymous

can you show me what you did ?

- anonymous

i was guessing lmao i hate math!

- anonymous

sorry:/

- anonymous

wait i think i got it....wait

- anonymous

what you get?

- anonymous

anyone can show me how to solve this?
2976.45=1963.45(1+r/4)^4(11)

- anonymous

You have an equation of the form:
a = b(x^n)
That will equal:
a/b = x^n -> ln(a/b) = ln(x^n) -> ln(a/b) = n times ln(x)
[ln(a/b)] / n = ln (x)
e^( [ln(a/b)] / n ) = e^[ln(x)] = x
"x" is your expression in parentheses, the 1 + a quarter of the rate.

- anonymous

what is that?? the formula i wrote is correct

- anonymous

Yes, your formula is correct and it matches mine. I am just using a general symbol method. For you to do some work here, you only have to make the substitutions and solve.

- anonymous

i dont understand that can you please just show me how to solve that formula i did it several times and got a wrong answer PLEASEE i beg you im so tired

- anonymous

You can do this!
2976.45=1963.45(1+r/4)^4(11)
a = 2976.45, b = 1963.45, n = 44
Just make those substitutions and follow my solution method. Just plug in and follow the steps.
Just try it. If you are that tired, I can give you a little more, but we tutors can't just give answers, we are required to show students how to solve and and top of it the students are supposed to do the work. I'll help as much as I can, but I can't just give ans answer.

- anonymous

Start by dividing both sides by what "b" is. It will start to isolate that exponential expression on the right-hand side.

- anonymous

i didd this many timessss im telling youu i just want to see where i went wrong i end up with 1.5159=5+r

- anonymous

^44

- anonymous

1.5159=(1+r/4)^4*11

- anonymous

then- 1.5159=5+r^44 im not sure about 5 than what do i doo

- anonymous

Good so far, keep going.

- anonymous

Wait, hold on.

- anonymous

This is where you went wrong. And before I show you, I just quickly want to say that doing it this way, you will learn. If I just did the steps, no way is anyone going to learn. This is learning by mistakes. Don't be afraid of mistakes.
Now,
The (1 + r/4) has to stay in parentheses for quite a while. Always respect the parentheses. They take precedence over the exponentiation. If you don't like that long expression in parentheses, call it "x" for now.

- anonymous

So, I'll take over from here for a little while and give you a little break. Hold on while I type.

- anonymous

1.5159286 = (1 + r/4)^44
ln 1.5159286 = ln [(1 + r/4)^44] = 44 times ln [(1 + r/4)]
(ln 1.5159286) / 44 = ln [(1 + r/4)]
e^[(ln 1.5159286) / 44] = e^(ln [(1 + r/4)]) = (1 + r/4)

- anonymous

Are you still getting this or did you get lost anywhere along the way? Should I stop or go on?

- anonymous

i dont understand the way you type i have all the steps in my paper can you just give me the second to last line of this problem so i can see if its the same i get 1.0094=4+r

- anonymous

then i have to take away 4 from each side

- anonymous

i keep getting an negative number

- anonymous

ok, we'll do it that way. Hold on.

- anonymous

1.5159^1/44=4+r^1/44
this is where i can stuck putting it to the power of ^1/44 i get 1.0094 which idk is right or not please help me fast its late

- anonymous

e^[(ln 1.5159286) / 44] = e^(ln [(1 + r/4)]) = (1 + r/4)
e^[(ln 1.5159286) / 44] - 1 = r/4
4(e^[(ln 1.5159286) / 44] - 1) = r
The right side is the rate. The left side is:
0.03800011
That's 3.8%

- anonymous

That's the annual rate. It's 4 times the quarterly rate of:
0.9500028 percent.

- anonymous

so where did i go wrong

- anonymous

I know it's late and you're tired, so tomorrow, you might want to go over all of this. I strongly recommend this.
Good working with you and thx for the recognition.
More importantly, just hang in there!
You went wrong by taking that 1 + r/4 out of the parentheses. That stays in there until the very end.

- anonymous

Fast? It's going to take me a while just to read it!

- anonymous

thats fine

- anonymous

Well, I got problem #11, it's "b", not "c" like you have it, but you were not far off.

- anonymous

thanks

- anonymous

#12 is quarterly, not monthly. I don't think you are getting this just yet. You need to practice this a lot more.

- anonymous

these are practice problem i did like 50 and these are the ones i wasnt sure about

- anonymous

i just want to know which ones i need to practice more

- anonymous

how are 13 and 14 last two?

- anonymous

im sure about the rest just not these 4

- anonymous

You had #11 and #12 wrong and I got you right answers. I figured out #13 (didn't look at #14 yet). I need to see your work since you are not getting these right. Show me your work on #13.

- anonymous

my work is on paper its going to take me a while to type but i think 13 is okay

- anonymous

Yes, #13 is definitely 88.

- anonymous

for 14 i think its wrong

- anonymous

What is "n" and "an"?
I don't get what those expressions mean. To do this problem, I need to know what "n" and "an" stand for.

- anonymous

thats what im trying to figure out

- anonymous

Not the values, what is the meaning of "n" and "an"? They stand for something even before we figure out the values.

- anonymous

i think n is number of cells and an is days or vise versa thats what im trying to figure out

- anonymous

i'll just go with A

- anonymous

Hold, on I figured it out algebraically.

- anonymous

I'm just trying to relate my answer back to the crazy notation in the problem.

- anonymous

You're going to have to help with relating the answer back to the problem's notation, but here it is in how I look at it:
For any day, starting with the 3rd day, that day's number of cells is:
[2 x (# cells in previous day)] - (# cells in previous to previous day) + 3
"previous day" is "day - 1"
"previous to previous day" is "day - 2"
Making sense?

- anonymous

yeah

- anonymous

I checked this answer out up to 88, which is day 7. Can you get this back into that crazy notation?

- anonymous

not really other than -1

- anonymous

Well, I know my formula works like a charm. We could try together to get that into the notation from the problem, but I still don't know about that "an" and "n". Are you sure that that problem was written down right?

- anonymous

While you're answering that, I'm working on that notation.

- anonymous

its A for sure thanks for your help

- anonymous

Yes, I just confirmed A. I figured out the notation, but you might want a bit of explanation on it.

- anonymous

I don't know where that post of yours went, I don't see it anymore, but A was correct, for sure.

- anonymous

Well! It looks like we're done! Nice working with you and good luck in everything!

- anonymous

Your so nice thank you so much please keep in touch please

- anonymous

And you're nice, too! You made my day! :-)

- anonymous

btw, "an - 1" is the # of cells in the previous day, but I think you know that by now.

- anonymous

And this was exhausting!

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