Mathematics - 20 November 2007

im algebra today we were joking around and my teacher said no one has died from doing math but later said that someone had exculy died from doing math and that who ever could tell her first would get extra credit that I need. I know most people dont just say what they want in a best answer but I like telling people. What im looking for is not only an answer but also the most sorces that says so.

2007-11-20 10:45:49 · 6 answers · asked by Anonymous

The question asks "The X-intercepts of a porabola are 5 and -7. What is the equation of the axis of symmetry? Explain."

I already know the answer is 12 by using simple + and - but is there a way to do it algebraically?

Thanks

2007-11-20 10:31:52 · 3 answers · asked by Anonymous

40 pieces are blue
35 are red
30 are green
50 are yellow
45 are white

If two pieces of bubble gum are purchased, what is theprobability that both will be yellow? Show all work and explain it in detail best answer 10 points!! thanks

2007-11-20 10:27:59 · 5 answers · asked by hockeyman25158 2

2007-11-20 10:24:04 · 15 answers · asked by julie q 1

what is x=?

2007-11-20 10:22:05 · 14 answers · asked by julie q 1

sqrt = squareroot
^2 = to the 2nd power.
Ok heres the problem:

x^2 - 10x + 21 = 0
a=1 b= -10 c= 21 Right?

x= -b +/- sqrt b^2 - 4(a)(c) over 2(a)
Thats the formula

Now does b go in the formula as -10? or 10 because the formula says -b not b so would that make it 10?

2007-11-20 10:21:51 · 4 answers · asked by net_phantom16 2

Please give the answer to four decimal places.

2007-11-20 10:19:56 · 1 answers · asked by dave h 1

I have to show that the density of the sum of 2 independent random variables is equal to:
f(x) = 1/(2sqrt(π)) * e^(-x^2/4)

Now I know that the formula needed is:
[-infinity to +infinity]∫f(x)(f(z-x)

And that a random variable X has a normal distribution if it has density:
f(x) = 1/(sqrt(2π)) *e^(-x^2/2)

This is what I’ve done so far:
(1/2 π) ∫ e^(-x^2/2) * e^(-(z-x)^2/2) dx

Now just focusing on the exponents:
(-2x^2 + 2xz)/2 – (z^2/2)
= - (x^2 – xz) – (z^2/2)
= - (x^2 – xz + z^2/4) – z^2/4

So the integral is now:
(1/2 π) * e^(-z^2/4) ∫ e^(-(x-1/2z)^2 dx

I said that the integral can be evaluated by subbing in u = x-1/2z.
du = dx.

So now I’m left with:
∫e^(-u^2) du.

I’m confused by how to get from this expression to 1/(2sqrt(π)) * e^(-x^2/4) because I thought that ∫e^(-u^2) du couldn't be computed.

2007-11-20 10:17:48 · 1 answers · asked by cornz000 1

This is how far i got:
ORIGINAL EQUATION: 6x+6(4)=3x-2
6x+24=3x-2

2007-11-20 10:17:37 · 5 answers · asked by Sarah B 1

2007-11-20 10:16:40 · 5 answers · asked by ma.roddy 1

1: Two jets leave an airport at the same time in opposite directions. The first jet is traveling at three hundred forty one mph and the other at three hundred thirty two mph. How long will it take for the jets to be 1,616 miles apart?

d r t
jet 1
jet 2


673 minutes
2.4 hours
2 hours 40 minutes
2 hours

2007-11-20 09:52:58 · 9 answers · asked by Est.1992 6

1.) A regular triangular pyramid with a slant height of 9m has a volume equal to 50 m^3. Find the lateral area.
the answer must be 84.65m^2

2.) A liquid vessel which is initially empty is in the form of an inverted regular hexagonal pyramid of altitude of 25ft and base edge 10 ft. How much surface will rise if 6779 liters of water is added?
the answer must be 12 ft.

please help me with these problems...

2007-11-20 09:50:06 · 1 answers · asked by greeK_god_HirYu 3

Describe in your own words the differences between the probability of an event and the relative frequency

2007-11-20 09:41:59 · 3 answers · asked by Anonymous

i got the first derivative is
y'=(3x^2)/(2y)
Then i think you do quotient rule on the right side, but what do you do on the left?

2007-11-20 09:36:50 · 7 answers · asked by Tim H 1

sec 4x = 2

tan 3x = 1

2007-11-20 09:23:23 · 2 answers · asked by Anonymous

Can you find numbers less than 200 that is divisible by four different prime numbers why or why not? Answer really descriptively and plz don't joke around answer as soon as possible it is due on 11/21/07

2007-11-20 09:18:29 · 5 answers · asked by Anonymous Girl 2

2007-11-20 09:14:02 · 6 answers · asked by Anonymous

I have found one way which is A=39 B=41 C=43 D=44 E=47 but my teacher asked us to Verify our answer wich means i need another answer. Please help

2007-11-20 09:07:45 · 1 answers · asked by tigard344816 1

Many years ago in the far off land of Chanzania, a prisoner was to be executed. The king of Chanzania was a sporting fellow who thought highly of good thinkers. The king offered the prisoner a chance for freedom. He was given 100 black balls and 100 white balls, and was told to distribute them any way he liked. He was then blindfolded and told to draw a ball at random from one of the urns. If he drew a black ball he would be executed. If he drew a white ball, he would have his freedom. ( The urns were rearranged.) The prisoner was smart so he was set free. How would you have distributed the ba;;s in the three urns?


I know how to do it. I just need the answer with the highest pro bability!

2007-11-20 08:45:48 · 5 answers · asked by Anonymous

what is the weight of a cord of oakwood? (cord = 128 cubic feet)

2007-11-20 08:42:29 · 1 answers · asked by Anonymous

answer this quick plz i need this for tomorrow

2007-11-20 08:38:32 · 6 answers · asked by Anonymous

In ancient times, four mathematicians discovered this game of logic. The four men were Hermos, Xentos, Appino and Tenedos. Hermos seated the other three men one behind the other, so that Xentos saw Appino and Tenedos, and Appino saw only Tenedos. Tenedos, who was in the front, saw neither Appino or Xentos.
Hermos had five hats which he showed to the three men. Three of the hats were grey, and two were white. Then Hermos put a hat in each man and tossed the remaining two aside.
“what color is your hat Xentos?” asked Hermos. Xentos did not know. Appino did not know the color of his hat either when asked. Tenedos, who could not see any hats at all , gave the right answer when he was asked the color of his hat, what was the color of his hat? How did he figure it out?

PLEASE HELP ME!

2007-11-20 08:38:28 · 3 answers · asked by Anonymous

solve:
(x^2 y ^3 z)^3 (x^3 yz^2)
where x= 0.5, y=2 and z=3

2007-11-20 08:36:22 · 5 answers · asked by AFSHAN L 1

Please, I am terrified of doing these, please could someone explain it to me? Thank you, so much.

*To the best answer

2007-11-20 08:33:13 · 26 answers · asked by Sarah I 2

what is the integral of (sec^2)3x?

i'd appreciate any help. thanks,

2007-11-20 08:21:45 · 4 answers · asked by yefimthegreat 1

2007-11-20 08:21:18 · 6 answers · asked by emrajbari 1

ln(sec θ) = -ln (cos θ)

2007-11-20 08:19:50 · 2 answers · asked by Anonymous

2007-11-20 08:11:09 · 5 answers · asked by Anonymous

2007-11-20 08:08:34 · 7 answers · asked by Chelsie T 1

What is the integral of 4θ+cos8θ ?

That's theta, not 0.

I'd appreciate any help. Thanks

2007-11-20 08:06:22 · 4 answers · asked by yefimthegreat 1