Using the Differential Equation Let P ( t ) be the population (in millions) of a certain city t years after 2015 , and suppose that P ( t ) satisfies the differential equation. a. P ' ( t ) = .03 P ( t ) , P ( 0 ) = 4 b. Use the differential equation to determine how fast the population is growing when it reaches 5 million people. c. Use the differential equation to determine the population size when it is growing at the rate of 400 , 000 people per year. Find a formula for P ( t ) .
Using the Differential Equation Let P ( t ) be the population (in millions) of a certain city t years after 2015 , and suppose that P ( t ) satisfies the differential equation. a. P ' ( t ) = .03 P ( t ) , P ( 0 ) = 4 b. Use the differential equation to determine how fast the population is growing when it reaches 5 million people. c. Use the differential equation to determine the population size when it is growing at the rate of 400 , 000 people per year. Find a formula for P ( t ) .
Solution Summary: The author analyzes how the population is growing at a rate of 0.15 million people per year, when it reaches 5 million.
Using the Differential Equation Let
P
(
t
)
be the population (in millions) of a certain city
t
years after
2015
, and suppose that
P
(
t
)
satisfies the differential equation.
a.
P
'
(
t
)
=
.03
P
(
t
)
,
P
(
0
)
=
4
b. Use the differential equation to determine how fast the population is growing when it reaches
5
million people.
c. Use the differential equation to determine the population size when it is growing at the rate of
400
,
000
people per year.
Find a formula for
P
(
t
)
.
With integration, one of the major concepts of calculus. Differentiation is the derivative or rate of change of a function with respect to the independent variable.
Can you answer this question and give step by step and why and how to get it. Can you write it (numerical method)
Can you answer this question and give step by step and why and how to get it. Can you write it (numerical method)
There are three options for investing $1150. The first earns 10% compounded annually, the second earns 10% compounded quarterly, and the third earns 10% compounded continuously. Find equations that model each investment growth and
use a graphing utility to graph each model in the same viewing window over a 20-year period. Use the graph to determine which investment yields the highest return after 20 years. What are the differences in earnings among the three
investment?
STEP 1: The formula for compound interest is
A =
nt
= P(1 + − − ) n²,
where n is the number of compoundings per year, t is the number of years, r is the interest rate, P is the principal, and A is the amount (balance) after t years. For continuous compounding, the formula reduces to
A = Pert
Find r and n for each model, and use these values to write A in terms of t for each case.
Annual Model
r=0.10
A = Y(t) = 1150 (1.10)*
n = 1
Quarterly Model
r = 0.10
n = 4
A = Q(t) = 1150(1.025) 4t
Continuous Model
r=0.10
A = C(t) =…
Chapter 5 Solutions
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