Question

SOmeone thats good at precalc please helpp

Answer 1

hit me

Answer 2

are you smart?LOL

Answer 3

i would think so

Answer 4

The inlation rate in the united states increased by approximately 2.78% per year from 2000 to 2007. What is the overall percent increase during the time period? use 8 years for your t value

Answer 5

inflation*

Answer 6

alright well you would use the future value equation:
FV=PV*(1+rate)^time

Taking an easy value for Present Value of 100 you would get:
FV=(100)*(1+.0278)^8=124.53

Now to get the overall percent increase we do this:
(FV-PV)/PV = (124.53-100)/100 = 0.2453*100= 24.53%

So your answer is 24.53%.

Answer 7

Basically i found how much $100 would be worth after 8 years of 2.78% inflation and then found out the percent by which that value had increased from $100.

Answer 8

make sense?

Answer 9

yes, thank you. i thought it hadto be exponentialthough, cause thats what were studdying

Answer 10

it is exponential: FV=PV*(1+rate)^time
where time is the exponent

Answer 11

oh okay, can i ask another one?

Answer 12

\[FV=PV*(1+rate)^{time}\]

Answer 13

yeah shoot

Answer 14

the oldest living trees in the world are the cristlecone pines in the white mountains. 4000 "growth rings" have been counted in the trunk of one of these, meaning theinner most ring is 4000 years old, what percent of the original carbon 14 you expect to find in the oldest ring of this tree?

Answer 15

does it give you the half life of carbon-14? if not i can just look it up

Answer 16

im pretty sure its 5730, just remembering from scinece class

Answer 17

yeah thats right, alright let me type out the answer, one sec...

Answer 18

The half life equation looks like this:
\[N_f=N_0(1/2)^{t/h}\]
where Nf is final amount of the material, No is the initial amount of material, t is the time elapsed, and h is the half life of the material.

So again, for sake of ease, we'll use 100 grams as the initial amount of carbon, and we plug in our other values in to get the final amount:
\[N_f=(100)(1/2)^{4000/5730}=61.64\]

So if 61.64 grams is left out of the initial 100 grams, the percent left would be:
61.64%

Answer 19

thats wierd we dont use those equations lol

Answer 20

Well they're pretty much all the same, and they're all exponential.

It's just the rate of growth or decay to the power of the time elapsed all multiplied by the initial amount.

Compare the future value equation and the half-life equation and you'll see the similarity.

Answer 21

oh okay(:ugh i have more, but theres soo much to type:(

Answer 22

you could just give me the short version, like just the numbers and a summary

Answer 23

pressure of air in earths atmosphere decreases exponentially with altitude. pressure at sea level is about 14.7 pounds per inch and the pressure at 2000 ft is approximately 13.5
write an exponential model for pressure of altitude,

Answer 24

alright one sec ill type it out

Answer 25

omg, youre going to universitly of texis?! i want to go there!!! ahah

Answer 26

haha yeah its a great school and austin is an awesome city

Answer 27

Yeah im just not smart enough for that pellet.haha

Answer 28

pellet*
lol

Answer 29

wtf, S H I T

Answer 30

hahaha this corrects too?! :o

Answer 31

Alright so the general form of an exponential modeling equation is:
\[y=a*b^x\]
where a and b are coefficients that we'll solve for with the values given.

Changing it so it is specific to our problem I'll write it as:
\[Pressure=a*b^{Altitude}\]
The problem says that at sea level (Altitude=0) the Pressure=14.7:
\[14.7=a*b^{0}\]
Since b^0=1, we get:
\[14.7=a\]
The problem also says that at Altitude=2000, Pressure=13.5:
\[13.5=14.7*b^{2000}\]
Solving for b, we get:
\[0.9184=b^{2000} \rightarrow b=0.9999574 \]
So the final equation is:
\[Pressure=14.7*(0.9999574)^{Altitude}\]

Answer 32

haha no i think you could get in. what major do you wanna go into?

Answer 33

??

Answer 34

omg youre soo smart :oi seriously dont even take any ap classes or anything.im from bosnia, so thats why its hard for me:/ what gpa do you have to have there?

Answer 35

well i dont really know much about international admissions but i would say if you're in the top 15% of your class you have a great chance and even top 20% you have a good chance.

Answer 36

LOL, my gpa is like a 3.4 weighted >.<

Answer 37

do you take SAT's or ACT's or something different?

Answer 38

so is that like on a 5 point scale?

Answer 39

4 point scalelol

Answer 40

well thats really not bad at all. to be honest, my SAT scores are what got me in here.

Answer 41

what did you get?and i only took the ACTs and got 20 out of 36 :o haha, but ididnt study or anything :(

Answer 42

I got an 800 math and 770 verbal

Answer 43

oh i dont even know what ts out of lol

Answer 44

800

Answer 45

dammmmmmmmmmmm, feel free to do my homework any time(L: haha

Answer 46

haha yeah im happy to help

Answer 47

well anything else while im here?

Answer 48

oh gosh, there is plenty, i just dont know how to sum them up lol::/ tooo much woork

Answer 49

do you have a way to scan it and then send it as a file?

Answer 50

omg, ill trty that loldidnt even think of it

Answer 51

haha alright cool

Answer 52

its being stupoid,a nd its not detecting the wirless connection:(

Answer 53

hmmm well you wanna shoot me one more and then see if you're able to try the rest on your own?

Answer 54

will you be on tomorrow?Lo

Answer 55

umm not really sure bc i have a final tomorrow but you could always email me

Answer 56

why arent you studying for that/?~? lol

Answer 57

well i feel pretty good about it but maybe im procrastinating just a bit haha

Answer 58

what class is it for? lol

Answer 59

You're so freakin smart i swear lol. my boyfriend was trying to help me, and hes a sophomore in college, but hes just sooo stupid :/ lol

Answer 60

haha he probably wouldnt be very happy to hear that

Answer 61

its a class called Solids, and trust me if i tried to explain it I would bore the hell out of you

Answer 62

Lol, ive told him before, many times :/So its okay, hesjust lazy. and what the hell is that hahah
stupidestr name ever

Answer 63

lol

Answer 64

yeah its basically about how solid thing react to heat and forces. so if you were to build a bridge, you could use the equations i learn in class to make sure it doesnt collapse when loaded with cars

Answer 65

Hahah wtf, why the helllare you taking that?! haha

Answer 66

im in engineering so its one of the required classes

Answer 67

ehh, i cant wait till college lol, but at the samw time im scared haha

Answer 68

dont be. its gonna the best time of your life i guarantee it. you know where you're goin yet?

Answer 69

oh nvm we already talked about this haha

Answer 70

but anyway yeah college is awesome dont worry