Mathematics - 17 September 2007

|ab| < or = 1/2(a^2 + b^2).

2007-09-17 03:46:47 · 1 answers · asked by doublenickelsonthedime55 1

I found a formula that says:

cos2+cosine2=1 (the 2s are squares)

How do you find that formula?
It was stated that the formula is related to the Pythagoras Theory. How come? Can someone explain?

2007-09-17 03:40:12 · 3 answers · asked by Anonymous

Need to convert:

r=1-2cos2t

and

3x^2-y^2=x^2/(2x-3y)

Thanks!

2007-09-17 03:36:40 · 1 answers · asked by Anonymous

I need help with these two problems, please.

Find all points having an x-coordinate of -21 whose distance from the point (-5, -14) is 34.

A hot air balloon is headed due east at an average speed of 6mph at a constant altitude of 190 feet as it crosses an intersection. Find an expression for the distance in d (in feet) from the balloon to the intersection "t" seconds later.

Thank you so much!!

2007-09-17 03:32:41 · 1 answers · asked by Jims Jennifer <3 2

Solve x^2+7x-2=0

what are the solutions?

find the x-intercepts of f(x)=x^2+7x-2



find and label the vertex and the line of symmetry.
f(x)=(x+3)^2
the vertex is?
the equation of the line of symmetry is x=



Give and approximate solutions to three decimal places.
x^2-5x+3=0
the exact solitions are x=
the approximate solutions to 3 decimal places are x=

2007-09-17 03:11:31 · 1 answers · asked by Anonymous

Solve the formula for the given letter. Assume all variables represent non-negative numbers. E=nc^2, for c.


The width of a rectangle is 5 ft less than the length. The area is 6ft squared. Find the length and the width.


Astudent opens a mathematics book to two facing pages. The product of the page number is 2352. Find the page numbers.


Determine the nature of the solutions of the equation. x^2+16=0.


Solve by completing the square. x^2+(3/2)x=3

2007-09-17 03:06:03 · 4 answers · asked by Anonymous

Determine the volume of the solid generated by revolving the region enclosed by the circle x^2 + y^2 = 1 about the line x = -2.The solid resembles a doughnut.

Post solutions, please. :)

2007-09-17 03:03:34 · 7 answers · asked by Anonymous

Could somebody please prove this statement?


Σ n² where n=0 to N-1 = 1/6*[N(N-1)(2N-1)]

Thanks

2007-09-17 02:57:39 · 2 answers · asked by rmtzlr 2

The strong monsoon winds caused a coconut tree 30m high to tilt at an angle of 80*[with respect to the ground ].A support wire 24m long is to be fixed at a point 5m from the top of the tree,so that the coconut tree becomes perpendicular to the ground.How far from the base of the coconut tree should the wire be fixed to the ground.

2007-09-17 02:55:59 · 3 answers · asked by g g 2

I have to prove the following by method of contradiction:

Let p and q be positive integers with p a) Prove that q-p divides p-1 if and only if q-p divides q-1.
b) Let d be a common divisor of p-1 and q-1. Prove that d divides q-p.

I understand the concept behind proving if, then statements by contradiction (assume the "if..." and also assume the not "then..." then reach a contradiction) but I'm confused as to how to do it for an if and only if problem.

2007-09-17 02:44:58 · 6 answers · asked by lilygnome 2

A professor gave a speech to an assembly of colleagues. After five minutes, half of the audience left; 10 minutes later a third of the remaining audience left. After 20 more minutes, half of the remaining audience left, leaving only 3 people in the audience. How many people were in the audience at the beginning of the speech?

2007-09-17 02:39:18 · 13 answers · asked by Barbie 1

Ana can fix a house in 2 days,Annie can fix a house in 4 days while Anton can fix it in 6 days. How long will it take for them 3 to build a house?

2007-09-17 02:31:01 · 7 answers · asked by hannah 4

Tony will paint 16 right, cylindrical columns. The top face and the bottom face will be covered, so those parts will not be painted. Each column is 18 feet tall and has a diameter of 10 feet. One gallon of paint will cover 350 square feet. If paint is sold only in full gallons, how many gallons of paint must Tony buy to paint all 16 columns?

2007-09-17 02:16:07 · 7 answers · asked by Barbie 1

What is the volume of a right, rectangular prism with side, front and bottom faces having area 15 square inches, 10 square inches and 6 square inches, respectively?

2007-09-17 02:09:32 · 2 answers · asked by Barbie 1

Just curious?

2007-09-17 02:00:24 · 12 answers · asked by Lovely Lady 27 5

I am studying to take my nursing school entrance exam. Here is one of the problems that I can't figure out. I take the test Thursday. If anyone can show me how to do this, I would be thankful.


Here is the problem The answer choices are under the problem.

If y(x-1)=z then x=


y-z
z/y + 1
y(z-1)
z(y-1)
1-zy

2007-09-17 01:59:32 · 5 answers · asked by Anonymous

2007-09-17 01:42:42 · 2 answers · asked by cay 1

What about 15/0?

2007-09-17 01:29:24 · 10 answers · asked by lizlongwell 1

A student made 60 and 68 his first two exams. Needs to pass the class with a 67 average. What does his third exam need to be in order to pass?
What is the problem and solution? Thank you!

2007-09-17 01:05:58 · 14 answers · asked by Vonnie 2

solve the equation 2^1-x=4^x

2007-09-17 00:47:54 · 4 answers · asked by Anthony 3

Choose an integer between -90 and +60. How do patterns help you model this integer?

2007-09-17 00:38:02 · 3 answers · asked by cherry9595 1

The length of a rectangle must be 11 feet more than the width, and the perimeter must be at least 34 feet. What is the range of values for the width?

2007-09-17 00:14:19 · 5 answers · asked by Vonnie 2

Please any1 can explain or better yet give a good website coz im making a report about it THANKS!!!

2007-09-17 00:11:42 · 1 answers · asked by Anonymous

solve each absolute-value inequality ? please help me out seriously

2007-09-17 00:08:48 · 1 answers · asked by Anonymous