Science & Mathematics - 1 February 2007

2007-02-01 18:22:56 · 7 answers · asked by Do not delete. 1 in Geography

Express each of the following equations in the form y=mx+c

a) 3x-2y=12
b). 4y-5=2x+5
c). 3(x-1)=4(y+2)
d). x/3+y/6=1

Question 2:
Find the gradient, x-intercept and y-intercept of the line

x/a+y/b=1 where a and b are constants

Question 3: Solve the following simultaneous equations algebraically:

3x-2y=12 and 2x-5y=19

Question 4: Factorise the following functions completely:

a). f(x)=x^2-3x-10
b). g(x)=2x^2-7x+3
c). h(x)=3x^2-7x-6

Thankyou. Please clearly show all of the working out and which question and answer each one is (question 1, 2, 3 or 4 and a b or c of each).
Thanks.

2007-02-01 18:20:58 · 4 answers · asked by Anonymous in Mathematics

2007-02-01 18:19:30 · 15 answers · asked by Anonymous in Earth Sciences & Geology

Can anyone tell me how big of a asteroid would have to hit the earth to be a global killer meaning to kill everyone on the planet, I know a lot of it gets burned up in the atmosphere, so how big would it have to be when it entered the atmosphere and how big would it have to be when it hit the earth.

2007-02-01 18:18:33 · 4 answers · asked by Male_42_us 2 in Astronomy & Space

algebra

2007-02-01 18:12:25 · 11 answers · asked by Steven 2 in Mathematics

he's drink alcohol (whicky, gin, rum) everyday about 300 to 400 ml.
how many time to take a liver damage.

2007-02-01 18:08:14 · 3 answers · asked by Anonymous in Medicine

And that's in cold water! And also, when you put say two ice cubes together in water, why do they stick together?

hope this wasn't a dumb question...=)

2007-02-01 18:07:34 · 4 answers · asked by -♦One-♦-Love♦- 7 in Physics

2007-02-01 18:04:30 · 9 answers · asked by Anonymous in Mathematics

State whether each of the following is a physical or chemical property........

a) Electricity decomposes water.
b) Ice floats on water
c) Potassium metal fizzes in water
d) Acetone dissolves in water

thanks,

2007-02-01 17:58:45 · 7 answers · asked by Sara 1 in Chemistry

2007-02-01 17:55:04 · 5 answers · asked by hotcandysmacker 2 in Physics

Is this dangerous?

2007-02-01 17:54:22 · 7 answers · asked by Anonymous in Medicine

2007-02-01 17:51:52 · 8 answers · asked by Anonymous in Engineering

Find the amount of substance, in mol, of:

H2O molecules in 20.0g of CuSO4.5H20

2007-02-01 17:43:18 · 1 answers · asked by lilangelsarah23 1 in Chemistry

2007-02-01 17:43:09 · 11 answers · asked by Anonymous in Astronomy & Space

2007-02-01 17:41:33 · 8 answers · asked by allansiew 1 in Engineering

What time period (of the Earth) is the longest?
What about the shortest?

In what periods did dinosaurs exist?

2007-02-01 17:40:21 · 2 answers · asked by Sarah S 3 in Earth Sciences & Geology

2007-02-01 17:40:03 · 7 answers · asked by Jacob 1 in Physics

(Polystyrene or thermocol)

2007-02-01 17:38:35 · 3 answers · asked by deostroll 3 in Physics

I am mostly interested in the fundamental theorem of calculas.

2007-02-01 17:37:12 · 7 answers · asked by Michael M 4 in Mathematics

Is there any value in the study of rocks and fossils? Explain.

2007-02-01 17:36:27 · 2 answers · asked by Sarah S 3 in Earth Sciences & Geology

I'm having a horrible time trying to figure this out...Derive a relationship for the height of a given pressure surface (p) n terms of the pressure p0 and temperature t0 at sea level, assuming that temperature decreases uniformly with height at a rate Γ Kkm-1. I have formulas but can't seem to put them together to get what I need...

2007-02-01 17:31:47 · 3 answers · asked by A-train 1 in Physics

2007-02-01 17:29:40 · 19 answers · asked by Ezequiel P 2 in Chemistry

What is an ellipse? What does it mean when an ellipse is in a perfect circle? What causes a black hole?

2007-02-01 17:29:33 · 2 answers · asked by Sally 2 in Physics

2007-02-01 17:27:21 · 11 answers · asked by mei_77 2 in Mathematics

A fishtank has a rectangular base width 2 feet and length 4 feet, and rectangular sides of height 3 feet. If the tank is filled with water weighing 62.5 lb/ft^3, find the work required to pump all the water over the top of the thank.

Now the answer is 2250 ft-lb.....but I need to set this up using an integral, and so far I know I only know I'm finding the integral from 0 to 3 of (3-y)(62.5 times some equation for x) ... can anybody tell me what the equation for x would be and why?

2007-02-01 17:26:58 · 2 answers · asked by untitledonald 2 in Mathematics

I would like to go into a specific field of medical studies. Are there any that has normal working hours? I know I might have to work long shifts during residency but after that is there any field that allows me to actually spend time with my family?

2007-02-01 17:25:40 · 4 answers · asked by -WANTED- 3 in Medicine

This is a question for my Physics Astronomy class.

2007-02-01 17:20:44 · 6 answers · asked by Andrew 1 in Astronomy & Space

I am struggling with this question and can't arrive at an answer. Any detailed guidance/help anyone could give would be greatly appreciated.

A light bulb is wired in series with a 132 ohm resistor, and they are connected across a 138.0 V source. The power delivered to the light bulb is 22.7 W. What are the two possible resistances of the light bulb?

lower value= ?
higher value= ?

I know that V=IR and P=IV and that my equivalent resistance is going to be R= 132 +x but past that I'm lost.

2007-02-01 17:19:14 · 2 answers · asked by larkinfan11 3 in Physics

Okay, now I'm having problems with finding the square roots of fractions...and not fractions such as 81/144, but some such as 1/6...please...can you help?

2007-02-01 17:16:21 · 4 answers · asked by RachelDeeJay 2 in Mathematics

2007-02-01 17:14:52 · 4 answers · asked by Anonymous in Physics