Mathematics - 6 December 2007

For each predator-prey system, determine which of the variables, x or y, represents the prey population and which represents the predator population. Is the growth of the prey restricted just by the predators or by other factors as well? Do the predators feed only on the prey or they have additional food sources? Explain.

a) dx/dt = -0.05x + 0.0001xy
dy/dt = 0.1y - 0.005xy

b) dx/dt = 0.2x - 0.0002x^2 - 0.006xy
dy/dt = -0.015y + 0.00008xy

show work/steps plz..thanks!

2007-12-06 15:31:18 · 2 answers · asked by Anonymous

2007-12-06 15:27:52 · 2 answers · asked by peaches 1

2007-12-06 15:18:52 · 11 answers · asked by Donna D 1

It says- Tell whether the following are true or false and explain your answeres:

A. Real Numbers are a subset of Integers.
B. Whole Numbers are a subset of Natural Numbers.
C. Integers are a subset of Real Numbers.

I think B is false, I think Natural Numbers are a subset of Whole Numbers. Am I correct? Help me on ABC, plz. Thank you!:)

2007-12-06 15:18:37 · 5 answers · asked by HollyW 1

2007-12-06 15:14:48 · 7 answers · asked by Martha S 1

Is 2 and 2/3 a Rational, Irrational, Natural, or Whole Number? Or is it an Integer? Need help plz!:)

2007-12-06 15:13:36 · 2 answers · asked by HollyW 1

One model for the spread of a rumor is that the rate of spread is proportional to the product of the function y of the population who have heard the rumor and the fraction who have not heard the rumor.

a) write a differential eq. that is satisfied by y.
b) solve the differential eq.
c) A small town has 1000 inhabitants. At 8am, 80 people have heard a rumor. By noon half the town has heard it. At what time will 90% of the population have heard the rumor?

show work/steps plz..thanks!

2007-12-06 15:12:30 · 2 answers · asked by Anonymous

what are the possible reminders when 100th power of an integer is divided by 125.

2007-12-06 15:11:58 · 1 answers · asked by MOHAMMAD S 1

solve for x. show steps
a) 3.4x to the exponent 2.5= 24.3 to the exponent 3.4

b) 3(x-2)squared = (3x-2)(x+5)

2007-12-06 15:07:26 · 1 answers · asked by Anonymous

rewrite to solve for F3. Show steps

1/F1 = 1/F2 + 1/F3

2007-12-06 15:04:50 · 1 answers · asked by Anonymous

s = 1/2 g t^2 + v0t < --- > (distance an object falls)


t = ???

2007-12-06 15:03:49 · 4 answers · asked by Matt H 2

the 1 and 2 under neath the fraction are like exponents but underneat the number indstead of on top i dont know wat dat means

2007-12-06 15:02:19 · 2 answers · asked by andrew n 1

1.6x2 - 4x - 3 = 0

2.x2 - 3x - 40 = 0

3.(x + 4)2 = 16

2007-12-06 15:00:37 · 4 answers · asked by ry ry 3

2007-12-06 14:57:59 · 1 answers · asked by Paige 2

The kinetic energy E(sub k) of a moving object, measured in joules, varies jointly as the mass "m" of the object and the square of speed "v". Find the constant of variation "k" if E(sub K) is 36 joules, "m" is 4.5 kilograms and "v" is 4 meters per second.

2007-12-06 14:54:08 · 2 answers · asked by Raquel - 3

(this ^ means to the power or expoinent whatever)

-6a^-2
-------------(over)
p^5

how is that not equal to

1
----------------(over)
6a^2q^5

2007-12-06 14:45:17 · 9 answers · asked by browneyedchick679 3

someone said that brains are divided up? is it true also that we use only 10% of our brain?

2007-12-06 14:41:58 · 30 answers · asked by Anonymous

I dont really know how to do these percent tables but I tried and I still dont get it, someone please help me im trying to do all my home work to get good grades at school and I dont want to repeat 9th grade.

100%= 70
10%= _
1%=_
50%=_
17%=_
30%=_
4%=_
300%=_

2007-12-06 14:40:01 · 6 answers · asked by Jewelz 2

i know its somthing like (x )(x ) help!!!!!!!!!!!!!

2007-12-06 14:31:28 · 6 answers · asked by andrew n 1

i need major help with it

2007-12-06 14:30:37 · 4 answers · asked by vero 1

x^3 - (13x^2)/4 + x = -3

I am totally confused, I get it down to 4x^3 - 52x^2 + 4x +12 = 0 and I don't even know if that is right.

2007-12-06 14:30:36 · 2 answers · asked by kelly w 1

I really dont know how to do this and its stressing me out please help me!!!
a. 50% of 600
b. 25% of 600
c. 20% of 600
d. 30% of 600
e. 40% of 600

2007-12-06 14:23:29 · 30 answers · asked by Jewelz 2

2007-12-06 14:21:58 · 5 answers · asked by soccerbreeee03 2

Integration of xcosx /(sin^2 X)

2007-12-06 13:56:18 · 2 answers · asked by adnan_hatim 1

2007-12-06 13:55:21 · 2 answers · asked by Anonymous

Integrate x multiply by (tan^2 2x)

2007-12-06 13:53:17 · 2 answers · asked by adnan_hatim 1

okay im solving linear systems with combinations by multiplying first! theres 9x-3z=20, 3x-6z=2 ......please solve!!!!

2007-12-06 13:41:59 · 6 answers · asked by questions123 3

One serving of Muesli breakfast cereal contains 4 grams of protein and 30 grams of
carbohydrates. One serving of Multi Bran Chex contains 2 grams of protein and 25 grams
of carbohydrates. A dietitian wants to mix these two cereals to make a batch that contains
at least 44 grams of protein and at least 450 grams of carbohydrates. If the cost of Muesli
is 21 cents per serving and the cost of Multi Bran Chex is 14 cents per serving, then how
many servings of each cereal would minimize the cost and satisfy the constraints? (Hints:
Formulate the problem as a linear programming problem and draw a graph to represent this problem and find
the minimum cost)

2007-12-06 13:39:38 · 2 answers · asked by ? 1

i feel so dumb when i ask these questions all the time, but here it goes:

Rectangle ABCD has vertices at A(4,7), B(3,1), and C(-3,2).
i have the equations for AB and BC, but i have to find one for CD and AD as well, and I'm not sure how to find the vertice for D if i even have to. I have to find the equation of the line that contains CD and find the equation of the line that contains AD.

2007-12-06 13:35:57 · 1 answers · asked by k4y14hhh 2

Intitial value 10
Limit to growth 40
Passing through 1,20

Initial value 12
limit to growth 60
passing through 1,24

any help would be great
Im stumpped

2007-12-06 13:35:30 · 2 answers · asked by Anonymous