where do you get stuck?
what data did you collect?
To get you started, suppose that the city grew from
1.2 million to 2.1 million in 15 years. Then to find the rate of growth, you solve
(1+r)^15 = 2.1/1.2 = 1.75
1+r = 1.75^(1/15) = 1.038
r = 0.038 or 3.8% per year
To find when the population was 1.83 million, solve
1.038^n = 1.83/1.2 = 1.525
n log 1.038 = log 1.525
n = (log 1.525)/(log 1.038) = 11.31
so, that would be in the 12th year
note that if r is negative, that means the population is decreasing.
Now see what you can do, and show some results if you need more help.
Can someone please help on this portfolio? I've been stuck on it for several days and i've only got task 1
I chose Cape Coral for the population that increased, and Fort Lauderdale as the one that decreased.
Task 2
a. Do some research and find a city that has experienced population growth.
Determine its population on January 1st of a certain year. Write an
exponential function to represent the city’s population, y, based on the
number of years that pass, x after a period of exponential growth. Describe
the variables and numbers that you used in your equation.
b. Find another city whose population starts larger than the city in part (a), but
that during this same time experienced population decline. Determine its
population for January 1st of the same year you picked for part (a). Write an
exponential function to represent the city’s population, y, based on the
number of years that pass, x after a period of population decline. Describe
the variables and numbers that you used in your equation.
c. Explain the similarities and differences between your equations in (a) and
(b).
d. During what year will the population of city (a) first exceed that of city (b)?
Show all of your work and explain your steps.
e. During what year will the population of city (a) be at least twice the size of
the population of city (b)? Show all of your work and explain your steps.
Task 3
Greece is currently experiencing a financial crisis.
a. Research the financial crisis in Greece and summarize it in one-two
paragraphs.
b. You are in charge. By what percentage will you tell Greece to cut their
spending? What is the decay factor?
c. Write a function modeling this debt situation if the initial debt in 2009 was
$500 billion and using the decay factor found in (b). Let y be measured in
billions of dollar and x represent the number of years since 2009.
d. When will Greece be debt-free if you are in charge? Should you reconsider
your answer to (b)?
2 answers
So, what's the answer? I don't get it I am taking it right now
1 answer