Mathematics - 9 October 2007

Marty has exactly 5 blue pens, 6 black pens, and 4 red pens in his knapsack. If he pulls out one pen at random from his knapsack, what is the probability that the pen is either red or black?

11/15
2/3
1/2
1/3
1/5

2007-10-09 17:55:04 · 4 answers · asked by Anonymous

You swing a bucket of water in a vertical circle at arm's length (.70m). What is the minimum number of revolutions per second you must maintain to keep the water from spilling out of the bucket.

2007-10-09 17:43:39 · 1 answers · asked by elbenito2513 2

2007-10-09 17:42:30 · 8 answers · asked by Freebrum 3

There are 10 lines in a plane, each intersecting each other. No three lines pass through the same point. At how many points do the lines intersect and into how many regions do they seperate the plane?

2007-10-09 17:41:59 · 2 answers · asked by jackie 2

A trough is 10ft long and its ends have the shape of isosceles triangles that are 3ft across the top and have a height of 1ft. If the trough is being filled with water at a rate of 12ft2/min, how fast is the water level rising when the water is 6 inches deep?

2007-10-09 17:36:29 · 1 answers · asked by Britt R 1

Find derivative of the following:

h(x)= cos(ln(arc cot(3x)))

Would like to see work as well please!. Thanks!

2007-10-09 17:33:49 · 1 answers · asked by Anonymous

The sum of the squares of two consecutive positive integers is 85. Find the integers.

I know the answer is 6, 7 but how do I get to that answer? if someone can please explain.

2007-10-09 17:28:33 · 10 answers · asked by Molina88 2

a.1/(1 –x + x2)

b. (4 + x)3/2

c. arcsin(x)

2007-10-09 17:11:42 · 1 answers · asked by Anonymous

[{sin a + cos(2b-a)}/{cos a - sin(2b-a)}] = cot (45-b)

thank you.

2007-10-09 17:05:52 · 1 answers · asked by Anonymous

[(sec^4 x + tan^4 x) / (sec^2 x tan^2 x)] - [(cos^ 4 x)/(sin^2 x)] = 2

thanks!

2007-10-09 16:53:24 · 2 answers · asked by chumme 1

how do you factor

x^3-4x^2-11x+30

2007-10-09 16:48:11 · 3 answers · asked by Anonymous

please......help

2007-10-09 16:43:52 · 3 answers · asked by Alexa H 1

suppose g: (a,b) ->R^n is a twice-differentiable parameterized curve. prove that g has constant speed if and only if the velocity and acceleration vectors are orthogonal at every t.

any help on how to approach and solve this question will be much appreciated.

2007-10-09 15:57:15 · 1 answers · asked by Dr H 2

17^14>31^11

I have the prove this without a calculator so I can't multiply.
I can use mathematical arguments only.

2007-10-09 15:24:15 · 2 answers · asked by Anonymous

Here's a conversation:
"How do you find how much stuff is under a graph?"
"You mean, an area under a curve - a function"
"Ye"
"Well, you pretend there are lots of rectangles underneath the curve, and add their areas. You'll notice that the more rectangles I have, the closer I am getting to a limit, a determined value" ... But after that, I just loose him. I try to explain how to get to the basic intg procedure, I even let him try out a mathematica simulation... Anyone know how I can explain the concept of the integral to an eighth grader - with really simple math? He /at least/ understands the concept of Riemman sums, but where do I go from there to reimman integrals and all the other fun stuff without supplementing summations and limits ?

2007-10-09 15:18:02 · 6 answers · asked by Anonymous

5a-b =17
b= 17-5a
3(a) + 2(17-5a) =5
3a +34 -10 a =5

whats the rest?

2007-10-09 15:11:49 · 10 answers · asked by Anonymous

Find a vector equation and parametric equations for the line.

The line through the point (1,0,6) and perpendicular to the plane x+3y+z=5.

this is only number 5 on my homework, I am screwed

2007-10-09 15:07:56 · 2 answers · asked by nkarasch 2

what is the answer, i have two different set of answers.

2007-10-09 15:06:26 · 10 answers · asked by toystoryx 1

Your solution should describe how you know that you have found all of the solutions.

2007-10-09 15:05:14 · 1 answers · asked by Anonymous

division in factoring factor the polnomial. Help me I can't do these division for the life of me
x^3+2x^2-5x-6,x+3

2007-10-09 14:58:57 · 4 answers · asked by mormar 1

how to work out this problem by zero factor property
2w(4w+1)=1

2007-10-09 14:52:41 · 2 answers · asked by mormar 1

I don't know how to do this. Could you please do it for me? Hey ten points right? :)

2007-10-09 14:52:15 · 2 answers · asked by Please H 1

2007-10-09 14:50:57 · 7 answers · asked by Allen T 1

Write result in slope-intercept form.

2007-10-09 14:43:34 · 2 answers · asked by Mr. Al 2

2007-10-09 14:42:24 · 10 answers · asked by Anonymous

See if you can answer this problem.

When setting the price of admission tickets for the amusement park, Tabitha wants the price for a two–child, two–adult family to be $100. She also wants the adult tickets to cost $8.00 more than twice the cost of a child's ticket. How much should a child's ticket cost?

2007-10-09 14:21:41 · 5 answers · asked by Anonymous

is there a special program for that?

2007-10-09 14:14:56 · 8 answers · asked by vadim k 2

There are three consecutive integers. Ten times the sum of the second and third numbers is one thousand,two hundred more seven times the first number. What are the integer?

Please show the steps

2007-10-09 14:12:17 · 4 answers · asked by saqib 1

f(x)=x*sqaure root(2x-3)
find Derivative.


THanks!

2007-10-09 14:09:34 · 2 answers · asked by Anonymous

OK heres my question... Robbie drinks 2 cups of soda each morning. Each cup contains 140 milligrams of caffeine. THe human body can metabolize about 12% of any caffeine remaining in the bloodstream each hour. To the nearest tenth, how may hours does it take until less than half the caffeine remains in Robbie's bloodstream? please solve and explain thank you

2007-10-09 14:01:25 · 7 answers · asked by ♥♥♥ 2