Mathematics - 30 July 2007

1) x^3 + bx^2 + 2bx - 1 =0
2) x^2 + (b-1)x + b =0

2007-07-30 23:51:19 · 2 answers · asked by saffy 2

How many feet is 191 cm

2007-07-30 23:40:25 · 5 answers · asked by Anonymous

9x + 7 = 5x - 3.


Please explain how

2007-07-30 23:12:46 · 13 answers · asked by ray 1

2007-07-30 22:47:24 · 9 answers · asked by Whatever 1

2007-07-30 21:51:58 · 5 answers · asked by Anonymous

Chris has found a tub in which to stand a christmas tree.The outline of the container is the curve y= 1/20 x^2 - 20 for 0

2007-07-30 21:45:46 · 1 answers · asked by fashaleviana 1

The probability density function of X, the lifetime of a certain type of device (measured in months), is given by

f(x) = 0 if x < 22
f(x) = 22 / x^2 if x > 22

Find the following:
P(X > 45) = ______

The cumulative distribution function of X:
F(x) = Answer 1 if x < 22
F(x) = Answer 2 if x > 22

2007-07-30 19:45:01 · 2 answers · asked by Anonymous

Consider the parametric curve given by the equations

x(t) = t^2 + 23t - 8
y(t) = t^2 + 23t + 33

How many units of distance are covered by the point
P(t) = (x(t), y(t)) between t = 0, and t = 2?

2007-07-30 19:29:41 · 2 answers · asked by Anonymous

How many permutations of ABCDEF have A appearing before F?

I know that combinations are used to solve this problem, yet I do not know how.

also,

How many permutations of the letters ABCDEF have A and F separated by at least one letter?

would this be (Total # of Permutations) - (# Permutations with A and F touching each other)?

2007-07-30 19:21:58 · 5 answers · asked by elyse h 1

for example you had a cube you wanted to know the distance from one point to the oppsite side (longest length possible , or right thorugh the middle)
e.g. point a is (0,0,0) point b is (6,0,0) point c is (0,6,0) point d is (6,6,0) point e is (0,0,6) point f is (6,0,6) point g is (0,6,6) point h is (6,6,6)

so if i wanted the distance from a to h how would i get it, (0,0,0) to (6,6,6)

2007-07-30 19:11:04 · 7 answers · asked by LazyForLife 2

How do you know where the curves will cross? For example: The problem "x=2 sin 2t, y=3 sin t" crosses itself at the origin, (0,0). "At this point, t=0 or t=pi." How do you know this?

2007-07-30 18:58:09 · 2 answers · asked by Kayla G 1

(-3a²)³(-a³)³(4a)³ divided by (2a³)³ = ??? and why plz
ty

2007-07-30 18:49:20 · 6 answers · asked by π_man 2

Show there's no function f:R --> R such that the composite h = f o f is given by h(x) = x^2 - 1996. This problem is considered difficult. I don't know how to do this.

2007-07-30 18:28:53 · 4 answers · asked by Sandra 1

solve for x : (2^(x+2))/ 16 = (4^(x-1))/ (2^(2x+1).

2007-07-30 18:20:42 · 4 answers · asked by Allison 1

The following induction "justification" that all sheep in a flock are the same color is wrong. I have to state what makes it wrong.

Base case:
One sheep, It is clearly the same color as itself

Induction step:
A flock of n sheep. Take a sheep, a, out of the flock. The remaning n-1 are all the same color by induction. Now put sheep a back in the flock, and take out a different sheep, b. By induction, the n-1 sheep are all the same color. Therefore, a is the same color as all the other sheep; hence all the sheep in the flock are the same color.

I have two ideas which i am working with

The base case states that only one sheep by itself is the same color. I can take a group of sheep and separate them. They can be all the different color, but by the base case they are considered the same.

In the induction step there is no comparison amoung the sheep. In order to tell if they are the same there should be a comparsion between them.

Still thinking about it. Any ideas?

2007-07-30 18:19:23 · 1 answers · asked by Loric M 2

The probability density function of X, the lifetime of a certain type of device (measured in months), is given by

f(x) = 0 if x < 22
f(x) = 22/ x^2 if x > 22

P(X > 45) = 22/45

The cumulative distribution function of X:
F(x) = 0 if x < 22
F(x) = ? if x > 22

(1 is not the correct answer).

2007-07-30 18:19:02 · 1 answers · asked by Anonymous

Find the equation y = ax^2 +bx +c whose graph contains the points (1, -1) (3, -1) (-2, 14)

you have to solve using the system of linear equation stuff, so I did:

-1 = a(1)^2 + b(1) +c
-1 = a(3)^2 + b(3) +c
14 = a(-2)^2 + b(-2) +c

and got the system:
a+b+c = -1
9a+3b+c = -1
4a-2b+c = 14

so I went through and solved:
first with lines 1 and 2:
-9a-9b-9c = 9
9a +3b+c=-1 and got -6b-8c=8 . . . plugged back into system

a+b+c = -1
-6b-8c=8
4a-2b+c = 14 then took lines 1 and 3 did the same:

-4a-4b-4c = 4
4a-2b+c=14 and got -6b-3c=18 plugged back into system:

a+b+c = -1
-6b-8c=8
-6b-3c=18 then took lines 2 and 3 did the same:

and got c = -3, pluged that back into a different equation and got b = 13/3 and plugged both into first equation and got a = -1/3

now did I do this correctly???

please let me know!! thanks!!

2007-07-30 18:16:55 · 2 answers · asked by Anonymous

prove that | x - y | is greater than or equal to | x | - | y |.

2007-07-30 17:49:55 · 2 answers · asked by Allison 1

2007-07-30 17:23:18 · 5 answers · asked by sunshine 1

The sequences:
a) 7,49,343,2401,16807,117649,823543
Is the nth term the ninth term?
What would be the nth term for this sequence?
b) 4,12,20,28
c)2,6,12,20

2007-07-30 17:22:35 · 5 answers · asked by Anonymous

Where can I find details and when to use each type?

2007-07-30 17:13:32 · 2 answers · asked by Alec113 2

It has to be used for schoolwork

2007-07-30 17:06:52 · 4 answers · asked by Anonymous

The solution of the equation below falls between what two integers?

2x + 8 = 7x + 20

A. -4 and -3 , B. -3 and -2, C. -2 and -1, D. 1 and 2, E. 2 and 3

thx

2007-07-30 16:36:39 · 9 answers · asked by Anonymous

1)Tickets for a concert sold for $11 and $8. If 600 tickets were sold for one evening and the the receipts are $5550, how many of each kind of tickets were sold?

2)Solve by substitution--
x+2y=10
y=2x
and
2x+y=9
x-3y=22

If some one could help so I understand

thanks

2007-07-30 16:10:00 · 6 answers · asked by ginch12345 1

1. When Max recieved 10x tapes, he then had 5y + 1 times as many tapes as ge had orginally. In terms of x and y, how many tapes did Stanley have originally?
1. 10x(5y + 1) 2. 5y + 1 over 10x 3. 2x over y 4. 10 over 5y + 1 or 5. None of the above

I got 3 but I'm not sure if it's right.

2. If x>0 and y>0 and x^9=4 and x^7 = 9 over y^2, which of the following is an expression for the value of x in terms of y?

1. (4/5)y 2. (2/3)y 3. (3/2)y^2 4. 6y 5. 36y^2

This I had no idea how to do.

Thanks for any help. Please show steps if possible.

2007-07-30 15:05:47 · 1 answers · asked by Anonymous

2007-07-30 14:39:02 · 4 answers · asked by Anonymous

sinx/cos^2x dx from 0 to pi/3

This is how it was written in the quiz and I can't get it to go into the calculator written this way...

2007-07-30 14:22:41 · 5 answers · asked by Anonymous

Express in simplest radical form

6^(5/3)*a^)2/3)*n^(11/3)
It would be great if you could help me out!! I used to know how to do this when I took the course a few years ago...but for my math class we have to do a review packet and now I have no idea what to do!! Please answer soon!!

2007-07-30 14:01:29 · 7 answers · asked by Anonymous

The question is, using a graphing calculator solve the sum of this sequence.

{-3.12n+4.69},n=25

My calculator is an HP 49g + and I still can't figure this thing out.

2007-07-30 13:56:17 · 4 answers · asked by Anonymous

Quad. Equat. Claification please?
EXAMPLE:
1) x² +3x+1 = 0
2) [Sol] x²+3x=-1
3) (x+ 3/2)² -9/4=-1<--(The left side is changed to include the square of a ploynomial)
4) (x+3/2)²=4/5
5) x+3/2= √5/2
6) x=-3√5/2
*Writing a Quad. form equation in the form of (x-d)²=e is called completing a square*

My question is this, in step 3) where did the "3/2" and the "-9/4" come from?

We are started with the equation in step 1) x² -+3x+1 = 0 but we can't factor it, when and how do you pull out the two "fractions"?

2007-07-30 13:41:22 · 6 answers · asked by Anonymous