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bigoldnastyfish
Group Title
The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time.
The price f(x), in dollars, of product A after x years is represented by the function below.
f(x) = 10250(0.63)x
Part A: Is the price of product A increasing or decreasing and by what percentage per year? Justify your answer. (5 points)
Part B: The table below shows the price f(t), in dollars, of product B after t years.
t (number of years) 1 2 3 4
f(t) (price in dollars) 4300 1849 795.07 341.88
 8 months ago
 8 months ago
bigoldnastyfish Group Title
The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time. The price f(x), in dollars, of product A after x years is represented by the function below. f(x) = 10250(0.63)x Part A: Is the price of product A increasing or decreasing and by what percentage per year? Justify your answer. (5 points) Part B: The table below shows the price f(t), in dollars, of product B after t years. t (number of years) 1 2 3 4 f(t) (price in dollars) 4300 1849 795.07 341.88
 8 months ago
 8 months ago

This Question is Closed

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
Which product recorded a greater percentage change in price over the previous year? Justify your answer. (5 points)
 8 months ago

dmezzullo Group TitleBest ResponseYou've already chosen the best response.0
Is this an exam?
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
no its the study guide
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
could you help me?
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Do you still need help?
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
yes
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Okay, I am really sorry, but I have to eat. Though, I can explain this question perfectly to you. So, I'll be back in like 20 to 30 minutes  i hope thats okay.
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
that is totally fine im just studying had a question on this problem
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
I am back. Sorry for being three minutes late.
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
its ok haha
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Okay, I shall help you now. Let me start:
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
When it doesn't say that "Kewlgeek555 is typing a reply..." it is because I am thinking or doing work. ;]
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Part I: You know that this function is DECREASING because 0.63, the number inside of the parenthesis, is LESS THAN THE NUMBER 1. I [think I] know the way to determine by what percentage it is decreasing. [I think] My teacher taught me that I have to subtract the number, in this case 0.63, from 1. So, 1  0.63 = 0.37. So it is decreasing by 0.37. Part II: Wait, what are the directions asking you to do???
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
Which product recorded a greater percentage change in price over the previous year? Justify your answer. (5 points)
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Okay, this is for the table in Part B, correct?
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
correct
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
And is this the table of Part B: dw:1387393002341:dw Is this correct? Also, I have to go do soemthing for my job, be back in like less than ten minutes, more than five minutes.
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
t (number of years) 1 2 3 4 f(t) (price in dollars) 4300 1849 795.07 341.88
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
I am back. I am still confused. Do you have a picture or something? But, now I think I understand A LITTLE. Is this correct?: dw:1387394201440:dw
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
yup
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Okay. Then, I think it is year 1  2.
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
can you prove it?
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Well, I subtracted years 1  2, 2  3, 3  4, and 1  2 was the greatest difference. I just didn't want to because what I said right there is a horrid "prove it" sentence. So, I can't really prove it.
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
NO, no. Actually, they are all changing by the same percentage: 43% less. And you can prove it by dividing year 2 to year 1 and dividing year 3 to year 2. Sorry for the inaccurate answer.
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
OOOOOOO I see
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
do you think you could help me with 1 more question?
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
Belinda wants to invest $1000. The table below shows the value of her investment under two different options for two different years. Number of years 1 2 3 Option 1 (amount in dollars) 1300 1690 2197 Option 2 (amount in dollars) 1300 1600 1900
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
Part B: Write one function for each option to describe the value of the investment f(n), in dollars, after n years. (4 points) Part C: Belinda wants to invest in an option that would help to increase her investment value by the greatest amount in 20 years. Will there be any significant difference in the value of Belinda's investment after 20 years if she uses option 2 over option 1? Explain your answer and show the investment value after 20 years for each option. (4 points)
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Where is Part A? Please tag me as several people are requesting help right now. D:
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
All i really need to know is the percentage of what option 1 is growing at
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
Part A: What type of function, linear or exponential, can be used to describe the value of the investment after a fixed number of years using option 1 and option 2? Explain your answer. (2 points)
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
i already did that part
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Oh, oh, okay. Well, um. Hm...do you have the function equation? Or the value at year 0?
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
there is no year 0
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Okay, so did you make a function?
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
I just need to know at what percentage option 1 changes at
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
Thats all I need to do
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
I can do the rest after that
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
This also seems to be a constant rate of growth. Year 2, 1690, is year 1 times 1.3. And year 3, 2197, is year 2 times 1.3. So, the rate of growth must be 130% of year 0, or in other words f(0) * 1.3.
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
I hope I'm not confusing.
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
what is the rate of chagne of option 1 as a percentage
 8 months ago

kewlgeek555 Group TitleBest ResponseYou've already chosen the best response.6
Okay, I don't know now. My mind is like something else today. Let me call @jigglypuff314 @texaschic101 @agent0smith @terenzreignz for you.
 8 months ago

jigglypuff314 Group TitleBest ResponseYou've already chosen the best response.3
I'm not too good at this either ;) http://www.ehow.com/how_8117999_exponentialequationtwopoints.html I got that the equation for option 1 is d = 1000(1.3^n) if that helps...
 8 months ago

bigoldnastyfish Group TitleBest ResponseYou've already chosen the best response.0
I figured it out thank you guys :D
 8 months ago
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