Mathematics - 28 June 2007

Answer these as quick as u can:
1)15*5
2)9-4
3)71-5
4)51/17(divide)
5)3*3*3*3
6)5/2*2/2*2
7)0.5*0.5
8)$6-£2(currency rate shouldn't matter)
9)14632*0
10)0/1298
How many do you think you got right???

2007-06-28 21:54:50 · 7 answers · asked by SIR TJM 5

For example: 2+3 (2 add 3 is...), 40:5 (forty divided by 5 is...)

2007-06-28 21:41:38 · 9 answers · asked by vogue 3

2007-06-28 21:26:13 · 5 answers · asked by Anonymous

X } -18 -13 1 11 13
P(X) } 3/10 1/5 1/10 3/10 _?__

(THis is supposed to be a chart where you have to fill in)

THe directions are:
Given the following sampling distribution:(above)
What is the mean of this sampling distribution?
(Please show every step when completing this problem)

2007-06-28 21:20:13 · 1 answers · asked by uhdiamond 1

2007-06-28 19:57:27 · 6 answers · asked by Anonymous

be mixed to obtain a total of 131 Liters @ 27% solution of HCl.







(I'm ABOUT TO GO CRAZY WITH THIS LAST QUESTION!!)

2007-06-28 19:43:37 · 3 answers · asked by Anonymous

Ive been out of school too long and cant remember how to answer this. As far as I can get is:

(X * Y) = [(Z*X) + (Z*Y) + (Z^2)]

XY = Z(X + Y + Z)

I just can't figure out the right move to get Z by itself.

2007-06-28 19:26:51 · 1 answers · asked by Anonymous

2007-06-28 18:41:09 · 5 answers · asked by eric m 1

a. f(x) = (x + 1)/(2x + 4)

b. g(x) = 2x/(x2 - 4)

c. h(x) = (x2 + 4x + 15)/(x + 2)

d. F(x) = (x3 - x - 1)/[(x - 1)(x + 2)]

e. G(x) = (x3 )/(x - 4)

f. none of these

2007-06-28 18:28:57 · 2 answers · asked by Anonymous

2007-06-28 18:08:00 · 4 answers · asked by eric m 1

Algebra hw plz help!!!?
the length of a rectangle is 5 more than 2 times the width.
the perimeter of the rectangle is 52cm.
what is the length and width of the rectangle?

and....

you have $5.20 in your pocket. there are six times as many nickels in your pocket as there are dimes.
how many dimes and nickels do you have in your pocket?
(convert them into cents while writing equation)
thank you!!

2007-06-28 18:04:53 · 8 answers · asked by Anonymous

Evaluate: 5squareroot-1

and

please simplify:(x^4/3)^6

2007-06-28 17:51:58 · 5 answers · asked by Peqo 1

13: What is the slope of this lthe line x - 2y = 1/2
-1
1/2
2
1


14: What is the slope of the line 2x + 2y = 3
2
-2
-1
1


15: Find the slope of the line that passes though points (2, 3), and (3, 2).
3
-1
2/3
-2

19: Find the slope of the line that passes though points (4, -3), and (-1, 4).
1/5
-5
-7/5
-1/5


20: Which is the equation of that line:
y = (-7/5)x + 13/5
y = (-7/5)x + 3/5
y = (-7/5)x + 2/5
y = 5x - 1


21: What is the slope of a line parallel to 3y = x + 2?
3
1
1/3
2

2007-06-28 17:39:35 · 4 answers · asked by me1026 1

A wheel has a diameter of 27.2 inches. What is the length of an arc intercepted by a central angle of 150o? Round your answer to one decimal place.

A. 71.2” B. 35.6” C. 2040” D. 4080”


_____ 2. Let  be an angle of rotation in standard position. If cos  > 0 and csc  < 0, in what quadrant does the terminal side of  lie?

A. Quadrant III B. Quadrant IV C. Quadrant I D. Quadrant II


_____ 3. The point (12, 16) is on the terminal side of angle. Find the exact value of csc .

A. 3/4 B. - 3/4 C. 5/3 D. 5/4
_____4. A building 150 feet casts a 50 foot long shadow. If a person looks down from the top of the building, what is the measure of the angle between the end of the shadow and the vertical side of the building to the nearest degree? Assume the person’s eyes are level with the top of the building.
A. 71o B. 18o C. 72o D. 19o

_____ 5. Find the reference angle for an angle that measures –439o.

A. 101o B. 169o

2007-06-28 17:27:17 · 4 answers · asked by lilmace24 1

I don't seem to understand, can someone please explain. Thank you.

2007-06-28 17:23:28 · 8 answers · asked by Christ' Soldier 2

3: Which of the following ordered pairs is a solution of the equation: 2x - 3y = 12?
(0, 4)
(8, 4/3)
(-6, 0)
(-3, -5)

6: What is the y-intercept of x - 2y = -6?
2
3
-6
-3

9: What is the midpoint of the segment joining the points (2, 2) and (2, 4)?
(0, 1)
(2, 3)
(2, 1)
(1, 1)


10: What is the midpoint of the segment joining the points (3, -4) and (-3, 4)?
(2, 3)
(0, 0)
(1, -1)
(-3, 4)

2007-06-28 17:21:55 · 6 answers · asked by me1026 1

I have the following PDE to solve:

(mu - ny)u_x + (nx - lu)u_y = ly - mx; l,m,n constant

I can't find a starting point to solve this. Separation of variables doesn't work and whatever I do I keep having all three variables (u,x,y) present in my starting eqns.

Has anyone got any tips?

2007-06-28 16:57:49 · 3 answers · asked by Anonymous

A goat is grazing in a circular field with a rope attached to it of length r. The goat is free to eat all the grass as it moves around in the circular field and the area of the field is obviously pi.r^2.
Question - How long is another piece of the rope if it is now fixed to a point on the circumference of the circle and the goat can now only eat 50% of the grass in the original circle.

2007-06-28 16:34:18 · 6 answers · asked by Anonymous

2007-06-28 16:22:48 · 5 answers · asked by jason.rowebot 3

In a vase, there are 2 red balls, 4 blue balls and a red ball. You have to pick 3 balls without replacement. How many blue balls do you expect to remove?

P.S.:- please provide method too, not just the answer...

2007-06-28 16:21:58 · 3 answers · asked by Anonymous

WHAT'S THE NEXT NUMBER?
IF YOU FIND OUT THE ANSWER, THEN EXPLAIN WHY?
IT COULD BE MATH PROBLEM OR PATTERN.

1 11 21 1211 3112 211213 312213 _____

2007-06-28 16:13:24 · 2 answers · asked by Anonymous

1) Prove the identities for sin(u+v) and cos(u+v) . By using Euler identities.


2) To prove the identities for sin(u-v) and cos(u-v), start with e^i(u-v)= e^iu e^-iv and repeat.


3) (Euler identities)

e^ix = cos(x) + i sin(x) = cis(x)
e^-ix= cos(x) -i sin (x) = cis(-x)

a) Use the fact that cos (x) and sin(x) are periodic with a period of 2 pie. Recall that a fuction f (x) is periodic w/ period T if f(x + T) = f(x). The exponential form of a complex number can thus b defined as z=re^10 , where r and 0 are the modulus and argument of z, respectively.

b) Treat the Euler identities as a 2 times 2 system of linear equations in sin (x) and cos (x) and solve the system. That is, find sin (x) and cos (x) in terms of e^ix and e^-ix. Verify that these representations of sine and cosine are purely real by taking their complex conjugates.

2007-06-28 16:09:10 · 1 answers · asked by Anonymous

2007-06-28 16:07:34 · 6 answers · asked by Toves 1

Not what I was finding. Thoughts?

2007-06-28 16:06:12 · 4 answers · asked by Anonymous

Algebra I

2007-06-28 16:03:37 · 11 answers · asked by LAINIE 1

2007-06-28 15:50:56 · 5 answers · asked by Toves 1

2007-06-28 15:50:37 · 4 answers · asked by munchahorousrex 3

So I was looking at the size of my monitor. 14 inches according to every box and label. I got out my tape measure and the tape measure says it's about 15.5 inches. So I calculated the number of pixels (~2074 in the native resolution of the monitor) and converted that number to inches and it came out right at 14 inches.

Did I miscalculate something or is there some weird difference in inch measurements?

Perhaps it's something to do with the resolution of the monitor?

2007-06-28 15:45:37 · 3 answers · asked by Artimaeis 1

In how many ways can you arrange the letters of the word think so that the t and the h are seperated by at least one other letter.

Thanks for the help!

2007-06-28 15:28:32 · 2 answers · asked by Icobes 2

A. circleB. zeroC. surface of a sphereD. threeE. twoF. oneG. hyperbolaH. greater than I. less thanJ. equal toK. infiniteL. elliptic planeM. hyperbolic planeN. lineO. luneP. pseudosphere
------------------------------
1: In elliptic or spherical geometry a _____ is a great circle.
2: Hyperbolic geometry is base on the Gauss, Lobachevski, and Bolyai Parallel Postulate which states that, through a point not on a line, there exists a _____ number of lines parallel to the given line.
3: In Euclidean geometry, there can be _____ right angle(s) in a triangle.
4: Euclid's Parallel Postulate states that through a point not on a line there exists _____ line parallel to a given line.
5: In hyperbolic geometry, the standard coordinate plane is replaced by a _____.
6: In elliptic or spherical geometry, the sum of the measure of the angles in a triangle is _____ 180 degrees.

2007-06-28 15:27:55 · 2 answers · asked by Anonymous