Let c be a positive number. A differential equation of the form dy/dt=ky^1+c where k is a positive constant, is called a doomsday equation because the exponent in the expression ky^1+c is larger than the exponent 1 for natural growth. An especially prolific breed of rabbits has the growth term My^1.01. If 2 such rabbits breed initially and the warren has 16 rabbits after three months, then when is doomsday?

Answers

Answer 1

Answer:

The doomsday is 146 days

Step-by-step explanation:

Given

[tex]\frac{dy}{dt} = ky^{1 +c}[/tex]

First, we calculate the solution that satisfies the initial solution

Multiply both sides by

[tex]\frac{dt}{y^{1+c}}[/tex]

[tex]\frac{dt}{y^{1+c}} * \frac{dy}{dt} = ky^{1 +c} * \frac{dt}{y^{1+c}}[/tex]

[tex]\frac{dy}{y^{1+c}} = k\ dt[/tex]

Take integral of both sides

[tex]\int \frac{dy}{y^{1+c}} = \int k\ dt[/tex]

[tex]\int y^{-1-c}\ dy = \int k\ dt[/tex]

[tex]\int y^{-1-c}\ dy = k\int\ dt[/tex]

Integrate

[tex]\frac{y^{-1-c+1}}{-1-c+1} = kt+C[/tex]

[tex]-\frac{y^{-c}}{c} = kt+C[/tex]

To find c; let t= 0

[tex]-\frac{y_0^{-c}}{c} = k*0+C[/tex]

[tex]-\frac{y_0^{-c}}{c} = C[/tex]

[tex]C =-\frac{y_0^{-c}}{c}[/tex]

Substitute [tex]C =-\frac{y_0^{-c}}{c}[/tex] in [tex]-\frac{y^{-c}}{c} = kt+C[/tex]

[tex]-\frac{y^{-c}}{c} = kt-\frac{y_0^{-c}}{c}[/tex]

Multiply through by -c

[tex]y^{-c} = -ckt+y_0^{-c}[/tex]

Take exponents of [tex]-c^{-1[/tex]

[tex]y^{-c*-c^{-1}} = [-ckt+y_0^{-c}]^{-c^{-1}[/tex]

[tex]y = [-ckt+y_0^{-c}]^{-c^{-1}[/tex]

[tex]y = [-ckt+y_0^{-c}]^{-\frac{1}{c}}[/tex]

i.e.

[tex]y(t) = [-ckt+y_0^{-c}]^{-\frac{1}{c}}[/tex]

Next:

[tex]t= 3[/tex] i.e. 3 months

[tex]y_0 = 2[/tex] --- initial number of breeds

So, we have:

[tex]y(3) = [-ck * 3+2^{-c}]^{-\frac{1}{c}}[/tex]

-----------------------------------------------------------------------------

We have the growth term to be: [tex]ky^{1.01}[/tex]

This implies that:

[tex]ky^{1.01} = ky^{1+c}[/tex]

By comparison:

[tex]1.01 = 1 + c[/tex]

[tex]c = 1.01 - 1 = 0.01[/tex]

[tex]y(3) = 16[/tex] --- 16 rabbits after 3 months:

-----------------------------------------------------------------------------

[tex]y(3) = [-ck * 3+2^{-c}]^{-\frac{1}{c}}[/tex]

[tex]16 = [-0.01 * 3 * k + 2^{-0.01}]^{\frac{-1}{0.01}}[/tex]

[tex]16 = [-0.03 * k + 2^{-0.01}]^{-100}[/tex]

[tex]16 = [-0.03 k + 0.9931]^{-100}[/tex]

Take -1/100th root of both sides

[tex]16^{-1/100} = -0.03k + 0.9931[/tex]

[tex]0.9727 = -0.03k + 0.9931[/tex]

[tex]0.03k= - 0.9727 + 0.9931[/tex]

[tex]0.03k= 0.0204[/tex]

[tex]k= \frac{0.0204}{0.03}[/tex]

[tex]k= 0.68[/tex]

Recall that:

[tex]-\frac{y^{-c}}{c} = kt+C[/tex]

This implies that:

[tex]\frac{y_0^{-c}}{c} = kT[/tex]

Make T the subject

[tex]T = \frac{y_0^{-c}}{kc}[/tex]

Substitute: [tex]k= 0.68[/tex], [tex]c = 0.01[/tex] and [tex]y_0 = 2[/tex]

[tex]T = \frac{2^{-0.01}}{0.68 * 0.01}[/tex]

[tex]T = \frac{2^{-0.01}}{0.0068}[/tex]

[tex]T = \frac{0.9931}{0.0068}[/tex]

[tex]T = 146.04[/tex]

The doomsday is 146 days


Related Questions

How do you graph x+6y=0

Answers

Answer:

We need to put this equation into either form of a line, pererably, slope intercept form!

Step-by-step explanation:

To do this, out goal is to get y alone.

1. We subtract x on both sides.

2 We divide 6 on both sides.

3. Our answer is y= -x/6 ( negative x divided by 6)

4. The y-intecept value is when x is equal to zero, so plug in 0 for x and solve for y.

5. The y intercept is (0,0)

6. From (0,0) point, you go down -1 and move 1 to the right each time!

The graph will be a line with a slope of -1/6 that passes through the points (0,0), (6,-1), and (-6,1).

What is Graph?

Graph is a mathematical representation of a network and it describes the relationship between lines and points.

To graph this equation, start by rearranging it to solve for y.

y = -x/6

Next, plot a few points to fill in the graph.

when x is 0,

y is 0.

When x is 6,

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Finally, connect the plotted points with a straight line.

The final graph will be a line with a slope of -1/6 that passes through the points (0,0), (6,-1), and (-6,1).

Hence, graph will be a line with a slope of -1/6 that passes through the points (0,0), (6,-1), and (-6,1).

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HELP PLS!!! BRAINLIEST WILL BE GIVEN​

Answers

It’s B. Hope it hopes

The Math Club makes 35 bars of soap a week and sells these at $20 each. Before the soap can be sold, 6 bars were eaten by a polar bear. If they sell the remaining bars of soap, how much will they make this week?

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Answer:I don't really know

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it is 15 if you add and then divid

7. Below are the steps taken to simplify the expression. Which justification matches Step c of the simplified expression? *

7x+8y+5x+3(y+1)

a. 7x + 8y + 5x + 3y + 3
b. 7x + 5x + 8y + 3y + 3
c. (7x + 5x) + (8y + 3y) + 3
d. 12x + 11y+ 3

A. Associative Property of Addition

B. Commutative Property of Addition

C. Combine Like Terms

D. Distributive Property​

Answers

Answer:

A. Associative property of addition

Step-by-step explanation:

The associative property is about the grouping of terms/numbers in parentheses in an equation.

what are the steps on finding common denominators. PLEASE HELP

Answers

Step-by-step explanation:

to find a common denominator, you have to find a number that "works" with every other number.

for example, say you have

2/4 and 8/12

First you need to find the common factor between 4 and 12, so list all your fours

4, 8, 12, 16, 20

Now list all your twelves

12, 24, 36, 48, 60

to find the common factor you look at both your list of numbers and find one that's the same, sometimes it takes a long list of numbers to find the common factor, but you will run into one.

So by looking at our list we see that 4 and 12 share the common factor of 12. but since 8/12 already has a denominator of 12, we are going to leave it alone.

now think about what you would multiply 4 by, to get to 12. The answer is

4 x 3 = 12

to make the numerator correct, you multiply it by the same number you did 4, so since your faction is 2/4 you should do 2 x 3 = 6

now you have your answer,

2/4 and 8/12 turns into

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and that's how you find it, let me know if you have questions :)

Need help I will offer brainalist + 10 points for correct answer (:

Answers

The answer you would be looking for is C. This is because both angles together form a right angle, making them complimentary!

The reason why it is not B as the other person answered is because supplementary makes 180 degrees. When that is not the correct answer to this question.

C is your answer! I hope that helped :)

i will give a crown if you are the first one to answer and if you get it right and if you just get it right then i will i give you a full star rating and a thanks

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Answer:

10x+8

Step-by-step explanation:

Answer:

10x + 8 is the answer

Step-by-step explanation:

To simplify the equation we must use the Distributive Property meaning that

we must distribute 2 to each term

                                                     5x(2) + 4(2)

                                                        10x + 8

            There You Go, Have a Wonderful Day, And Hope This Helps

What is the name given to a five-sided polygon that has congruent sides? A. hexagon B. regular hexagon C. pentagon D. regular pentagon

Answers

Answer:

C

Step-by-step explanation:

Pentagon

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Answer

C). pentagon is the correct answer.

Step-by-step explanation:

A pentagon has 5 congruent sides and 5 angles.

Can somebody please give me the answer I will mark u brilliant

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Answer:

x = 6.7

Step-by-step explanation:

We know that 3.5 + x = 10.2, so if we do inverse operations we can find out the value of x.

10.2 - 3.5 = 6.7

we can check our work by substituing it back in the equation for x

6.7 + 3.5 = 10.2

so now we know that x = 6.7. I hope this helps :)

Answer: x=6.7

Step-by-step explanation:

x+3.5=10.2

-3.5    -3.5

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Answers

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16x⁶y⁸|y³z|.........

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Step-by-step explanation:

EDGE

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Answers

Answer:

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Step-by-step explanation:

Answer:

30803/400

Step-by-step explanation:

77.0075 = 770075/10000

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Answers

Answer:

[tex]P(Sum = 9) = \frac{1}{9}[/tex]

Step-by-step explanation:

Given

Outcomes of rolling two dice

Required

P(Sum = 9)

From the given outcomes, we have:

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[tex]n(Sum = 9) = 4[/tex]

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[tex]P(Sum = 9) = \frac{4}{36}[/tex]

Simplify

[tex]P(Sum = 9) = \frac{1}{9}[/tex]

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Answers

Answer:

As viewed on the deck, the lighthouse is 50-6 = 44 m above. First we need to compute the two distances from the captain and the lighthouse. For point1:

d1 = 44 / tan(60) = 25.403 m

For point2:

d2 = 44 / tan(30) = 76.210 m

The distance traveled by the ship in five minutes is 50.807 m or 0.050807 km. Five minutes is equivalent to 1/12 hours.

The speed is then equal to 0.050807/(1/12) kph = 0.61 kph.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Step-by-step explanation:

Need answer asap, will give brainliest to the correct answer.

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Answer:The answer is the 2 one

Step-by-step explanation:

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Answers

Answer:

multiply each term in one polynomial by each term in the other polynomial.

add those answers together, and simplify if needed.

Step-by-step explanation:

Use FOIL !

1. multiply each term in one polynomial by each term in the other polynomial

2. add those answers together, and simplify if needed

Multiply polynomials the same way you multiply monomials and bionomials. You can also use symbolab to check if your answer is correct

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Answer:

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Step-by-step explanation:

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It's due in 30 minutes!!

Answers

1st is 40/100 = 4/10 =40%
2nd is 52/100 =26/50 = 52%
3rd is 24/100 = 6/25 = 24%
4th is 9/100 = 9/100 = 9%

Answer:

Top Left: 40/100 = 2/5 = 40%

Top Right: 52/100 = 13/25 = 52%

Bottom Left: 22/100 = 11/50 = 22%

Bottom Right: 9/100 = 9/100 = 9%

Step-by-step explanation:

I need help solving this​

Answers

The answer would be 108 ft^2

If the average person sleeps 7 hours every day how many days will it be before they have slept 35 hours

Answers

5 days.
35 divided by 7 = 5

Si un número es divisible entre 5, es múltiplo de 10? Expliquen porque por favor.

Answers

Answer: No es porque el número podría ser 35

Sam scored 98, 25, 105, 62 and 65 run in 5 matches. What was the
average score per match?

Answers

Answer:

75

Step-by-step explanation:

am scored 92,25,105,62,65 in 5 matches

The average score per match is

= total of runs in 5 matches/ 5

= 92+25+105+62+65/5

=355/5

= 71

Answer: the average score per match is 71 maybe try looking around before wasting points but im glad to help

What are some values to make -2x> 10 true ?
Please help ASAP!

Answers

Answer:

-6 -7 -8 -9 -10

Step-by-step explanation:

anything that keeps going from there dont do anything like -5 -4 -3 -2 -1 because it would be wrong

any negative number that keeps increasing after -6

how do you graph 3-2i

Answers

Answer:

X is first then Y

Step-by-step explanation:

x is up to down

y is side to side

you write it like this (x,y)

Find the value of x.
Pleaseeee I need helppp!!!!!!

Answers

Answer:

x = 38

Step-by-step explanation:

The measure of a vertex angle outside a circle = ½(difference of intercepted arcs)

Thus:

m<S = ½(UV - TW)

m<S = 34°

UV = (3x - 2)°

TW = (x + 6)°

Plug in the values into the equation

34 = ½((3x - 2) - (x + 6))

34 = ½(3x - 2 - x - 6)

34 = ½(2x - 8)

Multiply both sides by 2

34*2 = 2x - 8

68 = 2x - 8

68 + 8 = 2x (addition property of equality)

76 = 2x

76/2 = x (division property of equality)

38 = x

x = 38

47 in = ? ft ? in

3 ft 11 in

4 ft 0 in

3 ft 9 in

564 ft 0 in

Answers

Answer:

3ft 11 in

Step-by-step explanation:

1 foot equals 12 inches, 12 × 3 = 36 = 3 feet + 11 inches = 47 inches = 3ft 11in

Please help! And make sure to add a let statement!

Answers

Answer: See explanation

Step-by-step explanation:

1. Let the small number be x

Then, the bug number will be: x + 25

Therefore, x + x + 25 = 131

2x + 25 = 131

2x = 131 - 25

2x = 106

x = 106 / 2

x = 53

Small number= 53

Big number = x + 25 = 53 + 25 = 78

2. Let the small number be x

Then, the bug number will be: x + 14

x + x + 14 = 58

2x + 14 = 58

2x = 58 - 14

2x = 44

x = 44/2

x = 22

Small number = 22

Bug number = 22 + 14 = 36

The numbers are 22 and 36.

3. Let number of basketball sold be x

Therefore, number of football sold will be x+3.

Therefore, x + x + 3 = 27

2x + 3 = 27

2x = 27 - 3

2x = 24

x = 24/2

x = 12

12 basketball were sold

Number of footballs sold = 12 + 3 = 15

4. Let calories in bowl of soup x

Hamburger = 2 × x = 2x

Therefore, x + 2x = 738

3x = 738

x = 738/3

x = 246

There are 246 calories in bowl of soup

Calories in hamburgers = 246 × 2 = 492 calories

NEED HELP ASAP FREE BRAINLIST

Answers

Answer:

G

Step-by-step explanation:

Answer:

now they can have brain

Step-by-step explanation:

Give each side and angle measure rounded to the nearest whole number.

Answers

Answer:

Step-by-step explanation:

By applying sine rule in the given triangle,

cos(25°) = [tex]\frac{\text{AC}}{AB}[/tex]

cos(25°) = [tex]\frac{b}{400}[/tex]

b = 400[cos(25°)]

b = 362.52

b = 363 ft

By applying sine rule in the given triangle,

sin(25°) = [tex]\frac{\text{Opposite side}}{\text{Hypotenuse}}[/tex]

sin(25°) = [tex]\frac{a}{400}[/tex]

a = 400[sin(25°)]

a = 169.05

a = 169 ft

m∠A + m∠B + m∠C = 180°

25° + m∠B + 90° = 180°

m∠B = 180° - 115°

m∠B = 65°

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