anonymous
  • anonymous
(FAN AND MEDAL)
Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
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) = 72(1.25)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) 65 84.5 109.85 142.81 Which product recorded a greater percentage change in price over the previous year? Justify your answer. (5 points)
anonymous
  • anonymous
@jim_thompson5910 ???
Kash_TheSmartGuy
  • Kash_TheSmartGuy
About A. If you're multiplying two positive numbers, what do you think you're doing- increasing or decreasing?

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anonymous
  • anonymous
INCREASING/?
anonymous
  • anonymous
@Kash_TheSmartGuy ???
anonymous
  • anonymous
@jim_thompson5910 ???can you help me? please
anonymous
  • anonymous
i really need help,guyss
ali2x2
  • ali2x2
Your increasing because when you multiply 2 positive numbers you increase
ali2x2
  • ali2x2
|dw:1437183261078:dw|
ali2x2
  • ali2x2
You increased when multiplying 2x2. Mai name is the answar
anonymous
  • anonymous
@Michele_Laino @Vocaloid ???
Vocaloid
  • Vocaloid
the general form of a growth/decay exponential function is f(x) = a(r)^x our function is f(x) = 72(1.25)^x can you tell me what r = ?
anonymous
  • anonymous
i dont know, :(
Vocaloid
  • Vocaloid
f(x) = a(r)^x f(x) = 72(1.25)^x r = ?
anonymous
  • anonymous
90?
Vocaloid
  • Vocaloid
|dw:1437183987216:dw|
Vocaloid
  • Vocaloid
|dw:1437184021635:dw|
Vocaloid
  • Vocaloid
look at the underlined parts can you tell me what r = ?
anonymous
  • anonymous
1.25?
Vocaloid
  • Vocaloid
right, r = 1.25 the value of r tells us whether the function is increasing or decreasing if r > 1, our function is increasing if r < 1, our function is decreasing is our function increasing or decreasing?
anonymous
  • anonymous
increasing?
Vocaloid
  • Vocaloid
right, increasing now we need to find the percentage if r = 1.25 = 1 + (percentage/100), what is our percentage?
anonymous
  • anonymous
|dw:1437184167487:dw|
anonymous
  • anonymous
r = 1.25 = 1? @Vocaloid
anonymous
  • anonymous
i dont know @Vocaloid :(
anonymous
  • anonymous
|dw:1437184385353:dw|
Vocaloid
  • Vocaloid
not quite, perhaps we work it out a bit differently 1.25 = 1 + __ fill in the blank
anonymous
  • anonymous
this its what i get 1.25
Vocaloid
  • Vocaloid
not quite what number do I have to add to 1 to get 1.25?
anonymous
  • anonymous
|dw:1437184481903:dw|
anonymous
  • anonymous
|dw:1437184579597:dw|
anonymous
  • anonymous
72(1.25)? sorry but im not good at math @Vocaloid :(
anonymous
  • anonymous
wat
Vocaloid
  • Vocaloid
1.25 - 1 = ?
anonymous
  • anonymous
0.25?
Vocaloid
  • Vocaloid
right, 0.25 is the number I was trying to get at earlier, haha 0.25 (which is also equal to 25%) represents the percent increase per year
Vocaloid
  • Vocaloid
so we're finished with part A, ready to move to part B?
anonymous
  • anonymous
so wait the answer for part A? its
anonymous
  • anonymous
0.25 (which is also equal to 25%) represents the percent increase per year?
Vocaloid
  • Vocaloid
please read what part A is asking and review what we have done so far
Vocaloid
  • Vocaloid
"Part A: is the price of product A increasing or decreasing and by what percentage per year?"
anonymous
  • anonymous
increasing? right?
Vocaloid
  • Vocaloid
right, and what percentage?
anonymous
  • anonymous
25%? right?
Vocaloid
  • Vocaloid
right now are you ready to move to part B?
anonymous
  • anonymous
yes
Vocaloid
  • Vocaloid
alright, to find the percent increase for part B, we need to calculate the ratio f(2)/f(1) looking at the table, we know that f(2) = 84.5 f(1) = 64 f(2)/f(1) = ?
anonymous
  • anonymous
its 2?
anonymous
  • anonymous
o no wait
anonymous
  • anonymous
o yes its 2? right?
Vocaloid
  • Vocaloid
|dw:1437185687149:dw| try one more time
anonymous
  • anonymous
its 1.32?
Vocaloid
  • Vocaloid
oh, whoops, typo on my part |dw:1437185910222:dw|
Vocaloid
  • Vocaloid
can you try again, using 65 instead of 64?
anonymous
  • anonymous
65/64? thats what u say?
Vocaloid
  • Vocaloid
that's not what I meant, please look at this diagram |dw:1437186028756:dw|
anonymous
  • anonymous
1.3? :/
Vocaloid
  • Vocaloid
right! this gives our r value, 1.3 so, r = 1.3 now we need to find the percent increase 1.3 = 1 + (increase) what is the value of (increase)?
anonymous
  • anonymous
its 0.3?
Vocaloid
  • Vocaloid
yes! so, our increase is 0.3, which is the same as 30%
anonymous
  • anonymous
its that a question?
Vocaloid
  • Vocaloid
we need it to solve the last question
Vocaloid
  • Vocaloid
we found the percent increase for product A and product B, now tell me which one is bigger
anonymous
  • anonymous
1.3? right? @Vocaloid ?
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
so whats nexts?
Vocaloid
  • Vocaloid
which product had the bigger increase? A or B?
anonymous
  • anonymous
A?
Vocaloid
  • Vocaloid
please read over what we did carefully...
Vocaloid
  • Vocaloid
also, please read the problem again
anonymous
  • anonymous
O sorry my bad
anonymous
  • anonymous
its B SORRY
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
SO we done?
Vocaloid
  • Vocaloid
yes
anonymous
  • anonymous
for make sure i writte correct the answer its:
anonymous
  • anonymous
Part A: the price of product is increasing 25%Part Part B: 1.3
anonymous
  • anonymous
i writte correct
Vocaloid
  • Vocaloid
... please read what part B is asking
Vocaloid
  • Vocaloid
"Part B: Which product recorded a greater percent change in price over the previous year?"
anonymous
  • anonymous
B? 0.3? :/
Vocaloid
  • Vocaloid
it's asking which product (product A or product B) had the greater percent change
anonymous
  • anonymous
ITS product B? RIGHT
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
SO thats the answer for part B
Vocaloid
  • Vocaloid
right

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