Mathematics - 2 December 2007

consider these three equations: Y= 0.625^x, Y=0.375^x, and 1-0.5^x


a. Sketch graphs of the equations on one axes.


its my sister's problem so if anyone can help her or explain how to do this in the best way that you can it would help.

2007-12-02 09:03:08 · 1 answers · asked by Anonymous

Ok, so I know that you factor it so it would be:
(x+4)(x-2)<0,
and you find the critical values, so it would be:
x=-4 and x=2

What do you do after that (what would the solution set be) and how do you graph the solution set?

2007-12-02 09:01:42 · 5 answers · asked by Anonymous

Solve by the addition method:
2x+4y=-2
3x-y=11

2007-12-02 08:55:44 · 4 answers · asked by tianna_85902 1

Here is the problem:
A box has a square base of side x and height y. Find the dimensions for which the surface area is 20 and the volume is as large as possible.
When I solved the problem, I came up with one of the sides equaling the square root of 10/3, but once I tried it in the first derivative test, it fails. Can someone help me out, my book is bad and I don't know where else but here to look.

2007-12-02 08:53:34 · 2 answers · asked by krispykreme487 1

2007-12-02 08:50:31 · 5 answers · asked by jokersrage2 1

If -2x+3=7 and 3x +1=5+y, the value of y is...

(A) 1 (B) 0 (C) -10 (D) 10

i know i can just plugin each mulitple choice into the problem but i can't show my work like that..
thanks a bunch for whoever can help me with this problem

2007-12-02 08:49:30 · 5 answers · asked by Blah 4

From dy/dx by implicit differentiation and evaluate the derivative at (2, -1).
x2y+y2x=-2

Please help me.

2007-12-02 08:45:33 · 2 answers · asked by Anonymous

In the ()..this is a fraction
2x-1
____
x+ 2
need help!

2007-12-02 08:41:49 · 8 answers · asked by Dixie 1

M is the line 2x-3y-12=0 that cuts the x-axis at p and the y axis at q.

1.find the co-ordinates of p and the co-ordinates of q.
2.find the area of the triangular region enclosed by M,the x-axis and the y axis.

ty in advance for your help.

2007-12-02 08:38:58 · 9 answers · asked by Anonymous

Selling 60x - x^2-500 trees a day I need to find maximum revenue.

A.) I need a revenue function where x = price per tree
B.) I need a maximum and minimum price to sell any trees
C.) What price maximizes revenue?

Thanks,

2007-12-02 08:37:28 · 1 answers · asked by John Avry 2

cos^2-sin^2=2cos^2-1

Thanks for your help!

2007-12-02 08:36:01 · 2 answers · asked by Anonymous

I need to determine whether the matrices are multiplcative inverse. ( * is used to show separation between each number) for some reason it was running all numbers together.


1 * 2 * -1 , 1 * 0 * 2
-1.5 * -3 * 1.75 , 3 * 2 * -1
0 * -1 * 0.5 , 6 * 4 * 0


Find the inverse of each matrix, if it exists.

-2 1 -1
2 0 4
0 2 5

2007-12-02 08:34:37 · 1 answers · asked by brighton 3

1. find (f of g)(x) for the pair of functions: f(x)=x-3; g(x)=√(x+4) , x ≥ -4

a)√(x-3) +4 b)√(x+1) c) √(x+4) d) √(x+4) -3

2. A large totem pole near Kalama, Washington, is 172 feet tall. On a particular day at noon it casts a 165 foot shadow. What is the sun's angle of elevation at that time? Round to the nearest tenth.
a) 46.2° b) 73.6° c) 43.8° d) none of these

3. A statue of a town's founder stands in the town park. Nicholas is 20 meters from the statue. The angle of elevation for Nicholas to see the top of the statue is 30°, and Nicholas' eyes are 1.3 meters above the ground. How tall is the statue? Round to the nearest tenth of a meter.

a) 19.5 m b) 11.5 m c) 20.8 m d) none of these

2007-12-02 08:14:06 · 1 answers · asked by Anonymous

It seems that I'm forgetting the easiest concepts! I know it's got something to do with Angle Addition Postulate or definition or supplementary, but I don't know how to prove it exactly. Any help is much appreciated.

2007-12-02 08:05:55 · 2 answers · asked by Anonymous

A=
[-1 0 -5]
[2 -3 -2]
[0 -5 3]

B = [-2] [-3] [4] (Make a column, 3 x 1!)

2007-12-02 07:58:04 · 1 answers · asked by Anonymous

2 sin2Θ - 7 = 4cscΘ

2007-12-02 07:51:11 · 1 answers · asked by Anonymous

help ! r equals c over 2 pie.

2007-12-02 07:44:43 · 2 answers · asked by happy k 1

I argued with my lecturer who insisted that 1.0046 can only be 1.005 if the "4" was to be any odd number. I am confussed, help.

2007-12-02 07:39:34 · 1 answers · asked by ralph O 1

2007-12-02 07:32:40 · 5 answers · asked by Anonymous

A weather station releases a balloon that rises at a constant 15m/s relative to the air, but there is a wind blowing at 6.5m/s toward the west. What are the magnitude and direction of the velocity of the balloon?

What is the resulting displacement of the following series of movements: 10.0m[N65oW], 20.0m[S], 15.0m [W15oS].

2007-12-02 07:17:27 · 1 answers · asked by Anonymous

f(x)=x^3+x, g(x)=f^-1(x), g(2)=1

what is the value of g'(2)?
i am not sure how to do this, so please help me

2007-12-02 07:15:39 · 2 answers · asked by dougo 2

solve these systems of equations and if a unique solution does not exist state weather the system is inconsistent of dependent

{5x-6y=21
{x-2y=5

2007-12-02 07:08:52 · 3 answers · asked by Anonymous

Hi ya

been doing an exercise and can'y get my head round this question.

A stone slides in a straight line across a frozen pond. Given that the intial speed of the stone is 5 ms and that it slides 20m before coming to rest. Calculate the coefficient of friction between the stone and surface of the frozen pond.

I worked out the the acceleration to be -0.625 but am not sure where to go next. Probably something really obvious.

Thanks

Matt

2007-12-02 07:07:46 · 5 answers · asked by matthew b 1

2007-12-02 07:05:10 · 1 answers · asked by abhin t 1

I made a bet with my teacher,he is really cool,i bet a box of brownies and 10$$ if i win i get no homework for a week a box of brownies and 7$$
The bet is i can think of a question he cant answer,or he doen't know the answer to I cant think of a question!!!!!! please help me thanks


He is a 6th grade math teacher

2007-12-02 07:04:05 · 6 answers · asked by Anonymous

can the langrange multiplier itself (i.e. Lambda) assume the value of 0? or do we assume the lamda is always a none zero value.

2007-12-02 06:56:47 · 3 answers · asked by Chris L 1

2007-12-02 06:54:45 · 2 answers · asked by abhin t 1

f(x)=x^2+6x-2
a) Find h, the x-coordinate of the vertex of this parabola.

b) Substitute the two whole number values immediately to the left and right of h into the function to find the corresponding y. Fill in the table below. Make sure your x-values are in increasing order in your table.
x y

h=

2007-12-02 06:45:54 · 2 answers · asked by ViewSonic 2

f(x)=2x-3\x^2+2
Horizontal:
Vertical:

b) g(x)=5x\x-1
Horizontal:
Vertical:

2007-12-02 06:43:14 · 2 answers · asked by ViewSonic 2

say you have C=(0 1 0 0), and A =
0 0 1 0
0 0 0 1
-1 1 0 0
1 -2 0 0

how do you get an outcome?

do you do c_1 * a_11 + c_2 * a_12 + c_3 * a_13 + c_4 * a_14, etc.? or something else? (underscore meant to denote subscripts).

2007-12-02 06:38:40 · 1 answers · asked by Rob H 4