Mathematics - 13 November 2007

lets say i played 160 games and won 65% how many games did i win?

Can some one help me ,please show work

2007-11-13 21:18:31 · 13 answers · asked by emi 1

There are 5 horses (A,B,C,D,E).
Each has an equal chance of placing first in a race (20%).
What is the probability that a punter will win a trifector in a bet (that is, the punter will successfully guess who will place 1, 2, and 3.)?

It would help me greatly if you could explain the formula.

I know that the probability of the punter guessing who will place 1 & 2 is just "P(A n B) = P(A)xP(B)." I thought maybe that means the formula for "P(A n B n C) = P(A)xP(B)xP(C)" but this doesn't seem to be correct. Thanks for any help.

2007-11-13 21:13:35 · 3 answers · asked by michael 2

Let (X,d) be a connected metric space.

Suppose A and B are closed subsets of X such that X=AUB, and AB is connected (AB means A intersection B).

Prove tha A and B are connected.
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I'm not quite sure where to start, I think I have to do something with continuity, but I'm not sure...

2007-11-13 20:58:50 · 1 answers · asked by greeneggs4spam 3

Limit as x-->infinity of sqrt(2x^2+1)/3x-5
This is an example in my book and they've divided numerator and denominator by x and then it became Limit as x-->infinity of sqrt(2+1/x^2)/3-5/x

I don't understand why the numerator is sqrt(2+1/x^2). Please explain. That's all I need to know. Thanks.

2007-11-13 19:00:59 · 2 answers · asked by Anonymous

If V1....Vn are n linearly independent vectors in R^n, and if C1...Cn are non -zero scalars, prove that the n vectors C1V1....CnVn are linearly independent.

2007-11-13 18:43:21 · 2 answers · asked by X Efficient 1

I cannot see by any means how this limit is true. How can it not be infinity??

2007-11-13 18:28:21 · 4 answers · asked by Theava 2

Given sequence 〈a_n 〉 n=1 to ∞ defined recursively by a_1=√6,a_(n+1)= √(6+a_n )
Prove that sequence is positive and increasing

Also determine whether sequence is bounded above if so exhibit upper bound if not show that n > 0

Based on conclusion you made above answer whether it converges or diverges

Compute lim as n approaches infinity a_n

Report It

2007-11-13 18:07:36 · 1 answers · asked by Anonymous

I cant figure out why this limit is true:
lim x-> infinity (2x^6+5x^4+7x) / (7x^6-3x^5-4x^3+10x) = 2/7

Why? Is L'Hopitals rule somehow involved?

2007-11-13 18:00:05 · 2 answers · asked by Theava 2

2007-11-13 17:45:30 · 1 answers · asked by triples3989 1

How do I find the degree of these polynomials?

4x^2 + 12xyz

And

3x^4y^2 - 5x^2y + 3

2007-11-13 17:40:24 · 1 answers · asked by Carissa 1

2007-11-13 17:30:05 · 15 answers · asked by Joseph P 1

help solving this equation

2z^2 + 2iz -1 =0

2007-11-13 17:22:19 · 3 answers · asked by Anonymous

Find the relative extrema, if any, of the following function. Use the second derivative test, if applicable. (Enter NONE in any unused answer blanks.)

The relative maximum is( ) at x =
The relative minimum is( ) at x =

2007-11-13 17:17:28 · 1 answers · asked by Anonymous

An 8 ft wall stand 27 ft from a building. Find the length of a beam that will reach the side of the building from the outside of the wall.

2007-11-13 17:15:46 · 1 answers · asked by googoogoo 2

Find the number of edges in a pyramid with seven faces

2007-11-13 17:13:30 · 4 answers · asked by Anonymous

2007-11-13 17:10:20 · 4 answers · asked by Theava 2

Afghanistan suffered two major earthquakes in 1998. The one on Feb 4 had a Richter magnitude of 6.1 causing 2300 deaths, and the other one on May 30 measured 6.9 on the Richter scale, killing about 4700 people. How many times more powerful was the deadlier quake?

Please help? I don't even know where to start and have been trying it for hours :(

2007-11-13 17:07:18 · 2 answers · asked by r5091 2

2007-11-13 16:59:34 · 5 answers · asked by Anonymous

subtract


(5y^2 - 3y +2) FROM (Y-1)

2007-11-13 16:55:36 · 1 answers · asked by cerotevivo2 1

if yes, please give and example, if no, explain why

please and thank you =)

2007-11-13 16:52:49 · 11 answers · asked by hi. 3

2007-11-13 16:46:47 · 2 answers · asked by drin 2

sec^2x=(sec 2x)(2-sec^2x)

2007-11-13 16:40:43 · 1 answers · asked by Andrew H 2

My book says the answer is x=10º + 120ºn or x=50º + 120ºn and I have no idea how to get that answer. Any help is greatly appreciated.

2007-11-13 16:37:43 · 8 answers · asked by AnonymousOne 2

check wheter the value of the variable is a solution of the equation.if its not,find the solution.

1.9=s+5
s=14
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2.-42=-14b
b=3
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3.m divided by -2=12
m= -24
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4.n divided by -6= negative 8 (-8)
n= -48
--------------------------------------...
5.-32=16b
b= 2
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6.y-6= -10
y=4
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7.m divided by negative =24
m= -12



AND THE REST ARE JUST SIMPLE.
8.-15t=60=
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9.a dividedby 20= -4
---------------------------------
10.-22= -11g=
-----------------------------------
11.b divided by -37 =0

2007-11-13 16:34:22 · 3 answers · asked by Alexia M 1

I'm in some desperate need for help on this problem I can't seem to fully wrap my head around...(the answer is perfect squares due to odd # of factors, but I must explain it clearly!! How?)

There are 1000 open lockers at a school, one locker for each of 1000 students. The first student comes in and closes all the lockers. The second student comes ina nd changes the condition of each second locker (so if a locker is closed, it is opened, and if a locker is open, it is closed). In other words, the second student opens lockers #2, 4, 6, 8, ...., 1000. Then the third student comes in and changes the condition of each third locker, i.e. opens locker #3, closes locker #6, opens locker #9, etc. The fourth student changes the condition of each fourth locker, the fifth student does so for each fifth locker, and so on, until eventually the 1000th student comes in and changes the condition of the 1000th locker. Which lockers are now closed??

2007-11-13 16:28:18 · 3 answers · asked by netsurfer733 2

2007-11-13 16:19:23 · 12 answers · asked by djgirl227 1

Use the given triangles to evaluate the expression. Rationalize all denominators.

I have two right triangles of a different size. The legs of the smaller triangle are both 1, and the hypotenuse is sqrt2, and the two acute angles inside the triangle are both 45 degrees.

The bigger right triangle has a small leg of 1, and the long leg of sqrt3, and a hypotenuse of two, the two angles inside of it are 60, and 30 degrees


tan 45° - sin 45°

2007-11-13 16:19:02 · 2 answers · asked by Austin J 1

the reaction A+2B--> products was found to have the rate law =k[A][B] predict by what factor the rate willincrease when the concentration of A is doubled and the concentration of B is also doubled.

2007-11-13 16:12:32 · 1 answers · asked by juan c 1

2007-11-13 16:07:02 · 4 answers · asked by Anonymous

I get different answers while trying to find inverse by different methods.Are all those answers right if my procedure is right?

2007-11-13 16:06:45 · 2 answers · asked by sweety 2