Science & Mathematics - 15 July 2007

2007-07-15 11:16:32 · 11 answers · asked by Robert 1 in Mathematics

2007-07-15 11:11:35 · 2 answers · asked by mastalee103 3 in Chemistry

I tried so many times to work this probelm ou i still cant get this answer which is (-12/7, 6/35).

Find the solution to each symbol of equation by substitution.

4x+5y=-6
x-5/3y = -2

Your help would be appreciated thanks!

2007-07-15 11:04:25 · 7 answers · asked by caligurl 2 in Mathematics

Why can't it be that God just created the Earth?!?

2007-07-15 11:00:14 · 42 answers · asked by starz_crash05 3 in Astronomy & Space

A surveyor was unable to directly measure the height of the mountain, so he set up his equipment at the base of the mountain at two different locations, A and B, 1500 meters apart from each other. He then measured the angle of elevation to the top of the mountain from each of these locations. The angle of elevation from point A is 20 degrees. The angle of elevation from point B is 32 degrees. Find the height of the mountain to the nearest meter.

2007-07-15 10:55:17 · 5 answers · asked by Anonymous in Mathematics

A rescue plane is flying over the open sea and sights a life raft. Find the angle of depression to the nearest degree if the sight distance from the plane to the life raft is approximately 6.8 km and is flying at an altitude of 2.9 km.

23 degrees
25 degrees
65 degrees
67 degrees

2007-07-15 10:54:41 · 1 answers · asked by Anonymous in Mathematics

A helicopter is flying over a lake and sights a boat at an angle of depression of 35 degrees. The water-surface distance from the helicopter to the boat is 2300 feet. Find the altitude of the helicopter to the nearest foot.

1610 ft
3285 ft
1319 ft
4010 ft

2007-07-15 10:53:17 · 2 answers · asked by Anonymous in Mathematics

2007-07-15 10:52:20 · 14 answers · asked by jazz h 1 in Zoology

What is the highest pressure achieved by man to compress liquids for instance in the laboritory

2007-07-15 10:49:17 · 1 answers · asked by Anonymous in Physics

2007-07-15 10:48:18 · 5 answers · asked by s_e_e 4 in Other - Science

This is kind of hard to explain without a picture but here goes...

Two poles measuring 3 feet and 6 feet stand vertically in a field. Wires are attached from the top of each pole to the bottom of the other. A third wire is then run vertically from teh meeting of the first two wires to the ground. What is the length of this wire?

It looks like it would be 2.5 feet. But I really have no idea how to figure this out.

I\
I \
6 I \
I \ I 3ft
I x\ I
I / x \ I
----------------------Not a great pic I know...It's pretty much two triangles....and i am trying to find out the length of the x line that connects the two. Any help would be appreciated...

2007-07-15 10:48:06 · 3 answers · asked by Erika H 5 in Mathematics

I was just reading on wikipedia about radiation poisoning.(very interesting i recommend a gander at it) Anyway it lists different levels of exposure and survivial rates and i was wondering that if say you got exposed to 100Sv or something very high to a small area like say your finger would that kill you? Also where is the line drawn between maximum amount of area exposed and death.

2007-07-15 10:44:55 · 10 answers · asked by Anonymous in Physics

Find f '(a).

f(x) = sqrt(8x+1)

Do you use the def. of a derivate to solve? I tried that but my answer wasnt right...

2007-07-15 10:43:31 · 10 answers · asked by Anonymous in Mathematics

2007-07-15 10:36:50 · 9 answers · asked by Anonymous in Astronomy & Space

I've seen 150mW lasers that cut through electric tape and ignite wood from 20metres away, but then I see 240mW lasers that couldn't turn petrol-soaked paper into flame. Am I missing something here?

2007-07-15 10:24:12 · 9 answers · asked by Anonymous in Physics

What do wasps feed on?

2007-07-15 10:19:36 · 3 answers · asked by Anonymous in Zoology

2007-07-15 10:15:34 · 8 answers · asked by Whisperer 1 in Astronomy & Space

dont answer with stupid things just to get 2 points

2007-07-15 10:12:26 · 3 answers · asked by tom h 1 in Astronomy & Space

Im learning how to graph and I was wondering if someone could show me how to solve this and what to do when Im graphing. Im not understanding it very much and the examples are not all that helpfull

Graph using the intercept method: x + 3y = 6

2007-07-15 10:08:02 · 3 answers · asked by trevor s 2 in Mathematics

Combine like terms: 5w + 5x – 9w

A) w + x
B) 10w – 9x
C) –4w + 5x
D) wx

2007-07-15 10:06:45 · 10 answers · asked by Tainteddeceptions 3 in Mathematics

Say for example the polar bear or the blue eyed blonde human

2007-07-15 10:05:46 · 23 answers · asked by pups 5 in Zoology

Use the distributive property to remove the parentheses in the following expression. Then simplify your result if possible:

1/4(20+16)

2007-07-15 10:03:29 · 5 answers · asked by Tainteddeceptions 3 in Mathematics

2007-07-15 10:01:54 · 22 answers · asked by Mariaa 2 in Astronomy & Space

is that a derivative

2007-07-15 09:58:54 · 7 answers · asked by jake p 2 in Mathematics

2007-07-15 09:54:55 · 7 answers · asked by Anonymous in Weather

Utah Rapture
or
Utah Runner
or
Utah Thief

2007-07-15 09:44:08 · 3 answers · asked by Lauretta R 3 in Earth Sciences & Geology

2007-07-15 09:43:01 · 4 answers · asked by JAMES 4 in Physics

Which dinosaur was 75 ft long, weighed approximately 7 tons, was 43 feet tall and is thought to be one of the largest animals that ever existed?
Allosaurus
Brachiosaurus
Plateosaurus

2007-07-15 09:42:53 · 2 answers · asked by Lauretta R 3 in Earth Sciences & Geology

2007-07-15 09:39:05 · 2 answers · asked by waynne8 1 in Chemistry

In the mid-Atlantic (say from Long Island south to the Chesapeake Bay), when do autumn leaves typically reach their peak? When do you get to the point where most of the trees start to look winter-bare? And, how much variance in the peak dates is there from one year to the next?

(Here in Western Oregon's Willamette Valley it tends to start in early October, peaks just before Halloween, and the deciduous trees are mostly bare beginning around November 20. But we have more evergreens and winter ferns here, too)

2007-07-15 09:36:08 · 3 answers · asked by Kronner 82 3 in Weather