Mathematics - 21 June 2007

This is the question

A die is continuously rolled until the total sum of all rolls exceeds 225. What is the probability that at least 70 rolls are necessary?

Please help me on how to do this, THANKS!

2007-06-21 12:41:50 · 1 answers · asked by Tiago 2

If the long side of a triangle is 14.5" and the other 2 sides are equal how long are the other 2 sides? Please include the equation because I have to build something and if the 2 equal sides are too long I will have to change my dimensions. Thanks.

2007-06-21 12:05:03 · 13 answers · asked by Anonymous

What value of k would make 9x2 + 42x + k a perfect square trinomial?
The answer is k=49... but how do you get that?

2007-06-21 12:01:07 · 4 answers · asked by Bob B 1

think about it.

2007-06-21 11:36:33 · 33 answers · asked by Anonymous

whats are the missing numbers in this subtraction problem?

_, 2 6 _
- 1, _ _ 4
______________________
3, 1 5 8

2007-06-21 11:27:37 · 17 answers · asked by Hypnotic Cherry 2

The problem reads:

With one alarm clock, we have 0.975 probability of being awakened. What is the probability of being awakened if we are using two such alarm clocks?


I believe the solution is P (two alarm clocks)=(0.975)^2, or 0.951. I just got worried because 0.951 is lower than 0.975, and shouldn't ur chance of waking up increase if you use two alarm clocks more than one?

Confused

2007-06-21 11:24:28 · 7 answers · asked by helloWorld 1

2007-06-21 11:23:20 · 6 answers · asked by Anonymous

Okay so I can not begin to understand even the lesson itself, and I am not prepared to christmas tree the test. So here it is:

is AB || CD:

1. If angle 4 = 60° and angle 5 = 60°?
A maybe
B 15
C yes
D no
E it possibly might be
F none of the above

Look I need a explaination of what she's asking(in lameins terms). The point is she ONLY provided me with examples of word problems and now I am confused at what she's asking.It would also be great is any of you knew of a website that relates to this. Thank you, community.

2007-06-21 11:17:26 · 6 answers · asked by babbaler 2

(1-(1/cos^2x))/(1-cos^2x)

I know that the answer is 1/(cos^2x) but getting there is another question! Any help will be appreciated. This is practise for an exam i have tommorow by the way :).

2007-06-21 11:14:09 · 7 answers · asked by Yury Y 1

2007-06-21 11:03:15 · 8 answers · asked by Anonymous

I had a 4.0 in the first quarter

3.8 second quarter

3.0 third quarter

4.0 fourth quarter

2007-06-21 10:47:07 · 3 answers · asked by Brian M 2

Use interval notation to give the domain of the function

f(x)= 6/x+5

a) (-infinity,-5)(0,infinity)

b) (-infinity,-5)(-5,infinity)

c) (-infinity,-6)(6,infinity)

d) (-infinity,6)(6,infinity)

e) (-infinity,-5)(5,infinity)

f) None of the above.

2007-06-21 10:40:16 · 5 answers · asked by Alex T 2

w varies jointly as x and y varies inversely as the square of z. If w=225 when x=500, y=15, and z=10, find w when x=20, y=80,and z=5 and please explain how you get this answer i also need the steps to be able to work other problems similar to these out.

2007-06-21 10:18:54 · 4 answers · asked by toty467 2

2 ...... _..... 6
x .......... 4x^2
___________

3......_.....1
4x^2 ...........x



I know that looks stupid, but it was the only way that it looked like a complex fraction. basically, it's 2/x - 6/4x^2 divided by 3/4x^2 - 1/x

2007-06-21 10:15:33 · 6 answers · asked by Anonymous

2007-06-21 10:11:03 · 6 answers · asked by Anonymous

1. [(-5a ^6)^-3] / (-5a^6)

2. 4x^(1/3) [3x^(1/3) - x^(4/3)]
------------------------------
2x^(-1/3)
You dont need to show work but you can if you want to

2007-06-21 10:07:36 · 2 answers · asked by wizkid 2

Since I screwed up when I typed this the first time, let me try again.

How would you calculate the odd of rolling at least one of two specific numbers with multiple dice (for example 1 and 5). I know the odds for a single die would be 1/3.

For what it's worth, this is not a homework question. This is for personal interest and it has been so long since I took statistics that I don't remember how this works.

2007-06-21 09:34:32 · 9 answers · asked by Justin H 7

possible solutions for [r'(1)] · [r''(1)] (dot product)

a. 22

b. 70

c. 166

d. 184

e. 246

or is it none of these?

2007-06-21 09:32:26 · 3 answers · asked by Olivia 4

the expression pie R to the second gives the area of a circle with the radius R. How many square meters of wheat were destroyed when an alien ship made a crop circle of diameter 25 meters in the wheat field?

If I remember right pie is 3.14
hald of the diameter is 12.5 is that the radius.. I guess I am not sure on this one.

2007-06-21 09:26:09 · 5 answers · asked by Mandalicious 1

x(mx - 1)/ (m^2)(x^2) -2mx

I need to know how to arrive at the ANSWER, which is as follows:

mx -1 / (m^2) (x) - 2m

Thanks!

2007-06-21 09:17:40 · 4 answers · asked by chrizzle08 2

I can't seem to get these problems will someone plz help me!!!

I'm Adding and subtracting radical expressions

combine, if possible. Do not use a calculator or table square roots

1. √ 5 - √ 6 + 3 √ 5 - 2 √ 6

2.√ 7 - √ 63

3. 2√ 276 - 4 √ 3

4. 6√ 5y - √ 20y

2007-06-21 08:24:54 · 8 answers · asked by Anonymous

I have to turn my homework in

2007-06-21 08:01:43 · 4 answers · asked by Anonymous

A. x>4
B. 2/5 C. x<2/5, x>4
D. x>2/5

2007-06-21 08:01:07 · 3 answers · asked by joe l 1

possible speeds of the object....

a. 0

b. 3

c. 6

d. 9

e. 12

f. 15

g. 18

or is it none of these?

2007-06-21 07:59:02 · 2 answers · asked by Doug 2

possible book solutions for [r'(1)] X [r''(1)] (cross product).....

a. 6 i - 6 j + 2 k

b. 6 i + 6 j - 2 k

c. 12 i - 16 j + 6 k

d. 18 i - 36 j + 4 k

e. 24 i - 96 j + 18 k

f. 24 i - 64 j + 48 k

or is it none of these?

.

2007-06-21 07:47:46 · 2 answers · asked by chris 2

possible solutions for [r'(1)] · [r''(1)]

a. 22

b. 70

c. 166

d. 184

e. 246

or is it none of these?

2007-06-21 07:45:17 · 2 answers · asked by chris 2

I=intgrt{1/(1+X^2)^n}dx

2007-06-21 07:45:05 · 1 answers · asked by uNadDicTed 2

sometimes, always or never

2007-06-21 07:44:30 · 5 answers · asked by Anonymous

If a vector valued function r(t) = f(t) i + g(t) j + h(t) k is continuous for all real values of the scalar variable t, then r '(t) must exist for all real values of t.

2007-06-21 07:32:03 · 3 answers · asked by Doug 2

Two cars start off at the same point on a straight highway facing opposite directions. Each car drives for 6 miles, takes a left turn, and drives for 8 miles. How far apart are the two cars?

2007-06-21 07:13:42 · 5 answers · asked by ThEcOoLeStGeEkYoUlLeVeRmEet 4