Mathematics - 2 September 2007

If three cards are drawn without replacement from a deck, find the probability that the third card is a face card, given that the first card was a queen and the second card was a 5.

Fractions
1/5
3/13
11/50
or
6/25

2007-09-02 11:27:35 · 4 answers · asked by Anonymous

2007-09-02 11:23:23 · 1 answers · asked by purplemonkey6662000 3

A stone was thrown into air from a roof of a building 100fts. high with the speed of 20ft/s and 30 angle( from the ground level) while neglectin air resistance find:
a) the system of differential equation describing the motion of the stone thogether with the corresponding initial conditions,
b) the solution to the system in part a
c) stones highest altitude.
d) the time needed for the stone to reach the ground,
e) stone's position ( from the building) when it hits the ground,
stones velocity( its a vector!) and speed when it hits the ground
exact result
please can you show all the steps
thank you!

2007-09-02 11:15:42 · 1 answers · asked by cafet 1

An archery enthusiast was testing his new bow. He shot an arrow straight up from the top of a building 48 feet high with an initial velocity of 32 feet per second. The height of the arrow (h measured in feet) after t seconds in flight is described by the equation
h = 48 + 32 t - 16 t**2.

Determine the number of seconds after the arrow is shot that it will strike the ground.

t = seconds

2007-09-02 11:13:29 · 5 answers · asked by lauren m 1

the instructions say find values of x between 180 degrees and 270 degrees.

1.)if sin x = -15/17, find sec x...


2.)if csc x = -3/2 find cot x.....




now it says find values of x between 270 degrees and 360 degrees.

3.) if cos x= 3/10 find cot x



4.) if tan x = - 1/2, find sin x



thanks in advance! please explain how u get the answers!!

you dont have to do every single one, but do as many as u can please!

2007-09-02 11:08:36 · 1 answers · asked by Anonymous

I can simplify expressions with powers if all you have to do is multiply, but I'm stuck on some more difficult problems. One of the problems I have to do is:

(x^2y)/(3y^3x^3) times (18x^4y^2)/(xy^6)

I'm not sure if you cross multiply or multiply regularly. Or if you have to simplify each side of the problem first?

Thanks!

2007-09-02 11:03:58 · 3 answers · asked by Anonymous

I know how to simplify square roots, but I don't know what rationalizing the denominator means. I have two problems that I'm stuck on:

1) 3√7/12
I'm supposed to simplify this, but I don't know how 7/12 can be simplified any more than it is.

2) √128 + √50
Neither of these square roots can be simplified, but if you add them, you get √178, which I don't think can be simplified either. So is there anything you can do to simplify this problem?

Thanks!

2007-09-02 10:53:29 · 9 answers · asked by Anonymous

a seven foot ladder, leaning agains a wall, touches the wall x feet above the ground. write an expression (in terms of x) for the distance from the foot of the ladder to the base of the wall.

i got f(x)=sqrt(x^2 +49)

is that right??



and i need clarification on a previously asked question....
simplify using only positive exponents. do not rationalize the denominator.

1. square root (4x-16) / fourth root {(x-4)^3}

2. [ (1 / x^-2) + (4 / x^-1 y^-1) + (1 / y^-2) ]^(-1/2)



sorry if its confusing (specially the second one...) let me know if you want clarification on any part of it!! thanks for the help!!!


please show steps...i think i have the right answer for 2, but im not sure... i got 1/x + 4/sqrtxy + 1/y




thanks soo much!!!

2007-09-02 10:51:35 · 6 answers · asked by Anonymous

1. x^2=square root of 50
2.x^2=square root of 4160

2007-09-02 10:46:58 · 2 answers · asked by Anonymous

I don't know how to write absoulute value on here. So I will just put an ! on both sides. The book says the answer is No Solution, Can someone explain why?
!7/2x+3! = -5

2007-09-02 10:42:52 · 7 answers · asked by calired67 4

(sqrt18, sqrt12) , (sqrt8, sqrt27)

I know how to find the midpoint, but the square roots in this problem are throwing me off. The answer is already given in the back of my book so you don't need to work it out for me..just please explain what I should do with the squareroots.

2007-09-02 10:37:25 · 4 answers · asked by Nicky 2

if I have -3x-squared)(-4x-squared) Would that make it 12x-squared or would it be not possible?

2007-09-02 10:34:49 · 6 answers · asked by RoXy 2

Verify that triangle PQR is a right triangle. P(3,2) , Q(-3,6) , R(5,5) You are supposed to use Distance Formulas and Pythagorean Theorem and I missed this class! HELP!

2007-09-02 10:26:18 · 3 answers · asked by Kitty 1

the directions say- solve for values of x between 0 degrees and 90 degrees.

1.) sec x = 2 , find tan x

i got tan x= root 3... but how do i convert this to degrees, and am i even doing it right?

2.) cot x= 1/2. find sin x

i got 1/sin x = root5 / 2

again....degrees??

help pleasee!!!

2007-09-02 10:15:31 · 4 answers · asked by Anonymous

A teacher decides to scale her class's grades upwards. She raises the lowest score, a 47, to a 65. She raises the highest score, a 78, to a 90. What's the linear function that would fairly convert the other test scores?

I do know the answer to this problem, but what I don't know is how to get there. What steps should I take?

2007-09-02 10:13:30 · 1 answers · asked by Cosette 3

(3a)^2b^-3
~~~~~~~~~
b^-2

thanks in advance! i tried everything and i still didn't get it!

2007-09-02 10:10:15 · 4 answers · asked by ggh 1

Simplify: |√(7)-7| - |-5|

I have the answer [-√(7) + 2] but must understand how to get the answer, please help!

Thanx a bunch!

2007-09-02 09:57:40 · 1 answers · asked by Anonymous

find the slope of the line with the equation???
3x-2y=12
i know the answer is 3/2 but i dont know how to get rid of the 12

2007-09-02 09:56:05 · 9 answers · asked by Ramona C 1

someone please help me solve these problems!

1.) Arctan( - root 3 over 3)


2.) sin ( sin -1 3/8)

by -1 i mean the little inverse sign

2007-09-02 09:50:28 · 4 answers · asked by Anonymous

Can someone walk me through this problem?
1/x - 1/(x+1) = 3

I started by multiplying the whole equation by x(x+1), so I could find the common denominator. I got:
x + 1 - x = 3x(x+1) or
1 = 3x^2 + 3x

Now I'm stuck. Did I do this first part right, and if so, where do I take it from here?

2007-09-02 09:47:45 · 3 answers · asked by Anonymous

2007-09-02 09:39:36 · 6 answers · asked by trixabelle29 4

A mathematical answer is what I need. Something like you need 3 noncollinear points to make a plane. Thanks

2007-09-02 09:31:47 · 5 answers · asked by bstankus24 1

2007-09-02 09:25:14 · 11 answers · asked by Amy Jo 1

The distance to Alpha Centaurai is 6.0 x 10^16 METERS. If space ship Fang can travel 8.0 x 10^7 KILOMETERS in 2.0 years, how many years does it take to reach Alpha Centaurai?

Sorry For the Caps

Originally people answer to this question was 1.5 x 10^9, but i need to know if it is right because i am dealing with Meters and Kilometers. And i think they answered the question assuming both numbers were meters.

2007-09-02 09:21:40 · 3 answers · asked by CaShMoNeY 1

this is the problem
3/8-3/5

i got -9/40 is that right

2007-09-02 09:12:32 · 4 answers · asked by Anonymous

To those who answer both, I'll give maximum star rating and best answer.

1st problem - find the slope, slope intercept form, stabndard form and two points on the line of an equation with an x int. of 4 and a y int. of -1.

2nd problem-- find the standard form, slope-intercept form, slope and two points on the line of an equation with an x int. of -3 and a y intercept of "none"

2007-09-02 09:05:20 · 5 answers · asked by Tameeka 1

I am not sure about the process in which to factor this equation. I have been working on it but haven't succeded.

x^4 - 13x^2 +36


Thanks!

2007-09-02 09:02:26 · 1 answers · asked by footballgrl 3

The professor has determined that the scores in his course are distributed with a mean of 75 and a standard deviation of 5. He announces that the top 10% of the scores will earn a "A". What is the lowest score a student can receive and still get A?

2007-09-02 08:58:58 · 3 answers · asked by Cinnamon79 5

is zero a whole number??

2007-09-02 08:54:36 · 2 answers · asked by Anonymous

I continue getting the answer x=92, which is wrong.

(x/8) + 4 = 12

2007-09-02 08:42:45 · 8 answers · asked by Anonymous