1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ahat [919]
3 years ago
9

Suppose that news spreads through a city of fixed size of 700000 people at a time rate proportional to the number of people who

have not heard the news. (a.) Formulate a differential equation and initial condition for y(t), the number of people who have heard the news t days after it has happened. No one has heard the news at first, so y(0)=0. The "time rate of increase in the number of people who have heard the news is proportional to the number of people who have not heard the news" translates into the differential equation
Mathematics
1 answer:
Gnoma [55]3 years ago
8 0

Answer:

y'(t) = k(700,000-y(t))  k>0 is the constant of proportionality

y(0) =0

Step-by-step explanation:

(a.) Formulate a differential equation and initial condition for y(t) = the number of people who have heard the news t days after it has happened.

If we suppose that news spreads through a city of fixed size of 700,000 people at a time rate proportional to the number of people who have not heard the news that means  

<em>dy/dt = k(700,000-y(t)) </em>where k is some constant of proportionality.

Since no one has heard the news at first, we have

<em>y(0) = 0 (initial condition) </em>

We can then state the initial value problem as

y'(t) = k(700,000-y(t))

y(0) =0

You might be interested in
Question is shown in picture
zalisa [80]
It is showing growth.
8 0
3 years ago
Use the binomial expression (p+q)n
zvonat [6]

Answer:

{0.16807, 0.36015, 0.3087, 0.1323, 0.02835, 0.00243}

Step-by-step explanation:

The expansion of (p+q)^n for n = 5 is ...

(p+q)^5 = p^5 +5·p^4·q +10·p^3·q^2 +10·p^2·q^3 +5·p·q^4 +q^5

When the probability p=0.3 and q = 1-p = 0.7 the terms of this series correspond to the probabilities of 5, 4, 3, 2, 1, and 0 favorable outcomes out of 5 trials.

For example, p^5 = 0.3^5 = 0.00243 is the probability of 5 favorable outcomes in 5 trials where the probability of each favorable outcome is 0.3.

___

The attachment shows the calculation of these numbers using a graphing calculator. It lists them in reverse order of the expansion of (p+q)^5 shown above, so that they are the probabilities of 0–5 favorable outcomes in the order 0–5.

3 0
3 years ago
HELP IM IN THE MIDDLE OF A TEST!!
Zanzabum
Th correct answer would be D
5 0
3 years ago
Mariam and Sana are excited that a new store just opened in town! They go together the first day it opens! Each time Mariam goes
Vadim26 [7]

Answer:

Mariam went to the store 5 times, while Sana went 3 times.

Step-by-step explanation:

Since Mariam and Sana are excited that a new store just opened in town, and they go together the first day it opens, and each time Mariam goes to the store she plans to spend Rs. 30, and each time Sana goes to the store she plans to spend Rs. 50, and a few weeks from now, Mariam and Sana are surprised to find out that they have spent the exact same total amount of money at the store, to determine what is the least possible number of times that Mariam has been to the store the following mathematical reasoning has to be done:

To know how many times Mariam went and how many times Sana went to the store, since she spends Rs. 30 and the other Rs. 50, and they have spent the same after a few weeks, it is through the search for the lower common multiple of both numbers.

Thus, the common multiple less than 30 and 50 is 150 (30 x 5 or 50 x 3). Therefore, Mariam went to the store 5 times, while Sana went 3 times.

8 0
2 years ago
Find an equation of a line containing the point (-6,3) and has slope<br> - 1/3
AfilCa [17]

Answer: y=-1/3x+1

Step-by-step explanation:

To find an equation that contains the given point and has the same slope, we can plug it into slope-intercept form to find the y-intercept.

3=-1/3(-6)+b         [multiply]

3=2+b                   [subtract both sides by 2]

b=1

Now that we know the y-intercept, we know that the equation is y=-1/3x+1.

7 0
3 years ago
Other questions:
  • A study concludes that 15 percent of all college students attend a gym class.
    7·2 answers
  • (3-6)(-14--12)<br><img src="https://tex.z-dn.net/?f=%283%20-%206%29%28%20-%2014%20-%20%20-%2012%29" id="TexFormula1" title="(3 -
    7·1 answer
  • If cos x = sin(20 + x) ° and 0°
    12·1 answer
  • Which is the definition of a line segment?
    15·1 answer
  • X+2y=12 <br> 3x-10y = 0<br><br> y=?<br> x=?
    13·2 answers
  • You want to put 520 quarters in coin wrappers you need one wrapper for every 10$ in quarters write an equation you can use to fi
    11·1 answer
  • The points A(0, 0), B(0, 4a - 5) and C(2a + 1, 2a + 6) form a triangle. If angle ABC = 90, what is the area of triangle ABC?(A)
    15·1 answer
  • Please write the answer.. i need help right now<br> | -3 √5 | = <br> | 7 - 5 √3 | =<br> | 0 + √5 | =
    7·1 answer
  • What is the value of 2 over 3 to the power of 0 to the power of -3
    6·1 answer
  • A tutor charges $40 per hour. in one week, the tutor spends 5 and a half hours tutoring one student and 10 hours tutoring anothe
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!