Science & Mathematics - 21 October 2007

2007-10-21 07:54:14 · 2 answers · asked by RD 1 in Astronomy & Space

a.) One number is 3 less than another. If 7 times the smaller number minus 3 times the larger number is 7, find the two numbers.

b.) Complete the ordered pairs for the equation y = 5x + 5.
(?,0), (4/5,?), (0,?), (-4/5,?)

c.) Find the slope of the line passing through the points (–2, 7) and (8, –1).

d.) An employee who produces x units per hour earns an hourly wage of y = 0.75x + 9 (in dollars). Find the hourly wage for an employee who produces 14 units per hour.

Thanks evrybody who helps out!!

2007-10-21 07:53:43 · 3 answers · asked by orion6676 2 in Mathematics

HW 1: Suppose we have two regular tetrahedrons, one blue and one red, and the vertices of each are numbered 1 through 4, so that when we roll each tetrahedron, each of the four numbers is equally likely to appear as the top vertex. Such tetrahedrons are essentially four-sided dice. How many possible outcomes are there when we roll these two dice?


HW 2: What is the probability that both die will show the same number?


HW 3: What is the probability that the sum of the numbers on the dice will be 3?


HW 4: What is the probability that at least one of the dice will show a 1?


HW 5: A school has a fund-raising raffle. 500 tickets are sold for $10 each. One grand prize of $1000 is awarded to the w inning ticket. What is your probability of winning the grand prize if you buy 10 tickets?

HW 6: If, in problem 5 there are two grand prizes, what are your chances of winning at least one of the two prizes if you buy 10 tickets? (Hint: think about this carefully. It may help to think about how you would calculate your chances of not winning either prize first.)

HW 7: Suppose a dart board is divided into three pie-shaped sections emanating from the center. The central angle of section A is 45 degrees, of Section B is 135 degrees, and Section C is 180 degrees. Given that a dart lands somewhere on the board, we assume that it is equally likely to land in at any given point on the board. What is the probability that it will land in each of the three sections?

HW 8: What is the probability that, if we throw three darts, they will all land in Section A?

HW 9: What is the probability that if we throw two darts, one will land in each of sections A and C?

HW 10: If you draw two cards from a full deck of 52 standard playing cards, what is the probability that they will be a pair?


HW 11: If you draw two cards from a full deck of 52 standard playing cards, what is the probability that they will be a pair of Jacks?

2007-10-21 07:50:36 · 2 answers · asked by Anonymous in Mathematics

2007-10-21 07:47:33 · 2 answers · asked by samantha 5 in Mathematics

its cholophylls aren't working .
how are some plants ever-green (like olives)

2007-10-21 07:45:46 · 2 answers · asked by alizeeer2005 1 in Botany

2007-10-21 07:45:43 · 19 answers · asked by Anonymous in Mathematics

Would the moon move further away or closer? Would the month increase or decrease?　Would the day increase or decrease? I'm a Physics teacher so please feel free to use Physics in your response..

2007-10-21 07:43:22 · 9 answers · asked by Anonymous in Astronomy & Space

2007-10-21 07:42:55 · 2 answers · asked by Anonymous in Botany

please give details. thanks

2007-10-21 07:38:32 · 5 answers · asked by megburf 1 in Mathematics

2007-10-21 07:38:09 · 4 answers · asked by DivCW 2 in Engineering

I cant figure any of these out!!
1)Find dy/dx if y=sin(x+y)
2)differentiate: y=csc^2(x)+cot^2(x)
3)differentiate: y=sin^2(t)-cos^2(t)
4)Find dy/dx if (x^2)-(y^2)=2xy
5)Find dy/dx for the equation (x^3)-(2(x^2)y)+3xy^2=38
6)Find dy/dx, then evaluate the derivative at the point (0,2): (x^2)-(2xy)=(y^2)-4
7)Find an equation for the tangent line to the graph of f(x)=√(x+1) at the point where x=3.8)
8)Find f '(x) for f(x)=2(x^2+5)^7

2007-10-21 07:36:09 · 1 answers · asked by Carolina 2 in Mathematics

Calculate the enthalpy change for the reaction shown below.
BrCl(g) Br(g) + Cl(g) H = ?

Use the following data.
Br2(l) Br2(g) H = 30.91 kJ
Br2(g) 2 Br(g) H = 192.9 kJ
Cl2(g) 2 Cl(g) H = 243.4 kJ
Br2(l) + Cl2(g) 2 BrCl(g) H = 29.2 kJ

I really thought it was 107.1 but that was wrong. HELP!?

2007-10-21 07:34:43 · 1 answers · asked by Donna L 3 in Mathematics

is pyroxene an intrusive igneous rock (formed underground) or an extrusive igneous rock (formed aboveground) ?

2007-10-21 07:31:56 · 4 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-21 07:28:14 · 1 answers · asked by saleha v 1 in Mathematics

What is your opinion on this? It blew my head off. Have always been into quantum physics but wow! If everyone was to see this, what effect would it have on the planet?

2007-10-21 07:28:02 · 5 answers · asked by ? 5 in Physics

Could someone narrow it down to the need to know basics please?!
Thanks so much!!

2007-10-21 07:27:51 · 1 answers · asked by Anonymous in Botany

Hi,

I seem to be having problems know when/how to use Hensel's Lemma and the Chinese Remainder Theorem... Any tips? Good advice? My midterm is on Monday, and I just seem stuck!

Thanks!

2007-10-21 07:27:08 · 1 answers · asked by yogastar02 2 in Mathematics

I'm pretty / 100% sure it was William Kemmler because he was the first person to be electrocuted or "fried" in the chair!! Am I right?

2007-10-21 07:23:34 · 3 answers · asked by michael_kleman2003 2 in Engineering

and a low tide is a neap tide ?

2007-10-21 07:22:57 · 5 answers · asked by lak3rz08 2 in Weather

What stars, planets, constellations, meteors etc is visible from Sydney, with or without a telescope, during this time of year?

Im planning to purchase a telescope within a month. Is there any sites to show what's up above Australia atm?

2007-10-21 07:22:21 · 5 answers · asked by Anonymous in Astronomy & Space

a 20g pellet is fired into a 200g wooden block initially at rest on a horizontal surface.
the block slides 5.1m before stopping.
the friction coefficient μ is 0.7 between block and surface.
what was the pellet's speed just before impact?

im having trouble with this because the only momentum questions i have ever done are the ones where at least one velocity is given, so i'm struggling here.

my thoughts on it are its something to do with kinetic energy, energy lost due to friction etc, and i worked out the pellet's speed on impact is 11x that of the pellet-block combination when it moves off after impact.

i dont care about the final answer really, just the method of finding it.
cheers.

2007-10-21 07:16:51 · 3 answers · asked by fpa06mr 5 in Physics

What would the consquences be for the Earth's interior layers?


thanks!

2007-10-21 07:15:50 · 3 answers · asked by dandelion 1 in Earth Sciences & Geology

thesis on geometry in art
one of my thesis is:
how goemetry is used in art
lines
polygons
volume

that is one of my thesis
what should the other two be?
they have to be so i can write 5 pages on itatleast 3 pages
thanks!

2007-10-21 07:15:06 · 1 answers · asked by Bluey 3 in Mathematics

thanks!!

2007-10-21 07:13:10 · 7 answers · asked by dandelion 1 in Earth Sciences & Geology

oh, n' why do many leaves change color in fall??

2007-10-21 07:13:05 · 5 answers · asked by alizeeer2005 1 in Botany

plese!!

2007-10-21 07:11:46 · 1 answers · asked by dododo 2 in Biology

a-sin(5π/3)

b-cos(-7π/6)

c-cot(7π/4)

d-csc(-13π/2)

2007-10-21 07:09:57 · 7 answers · asked by Anonymous in Mathematics

2007-10-21 07:05:03 · 1 answers · asked by Anonymous in Engineering

if you can, include a website source.

thanks!

2007-10-21 07:04:54 · 1 answers · asked by Allie 2 in Biology

If sinhx = (e^x - e^x)/2 & coshx = (e^x + e^-x)/2

I think you're supposed to substitute the equivalents of sinhx and coshx into the orig. equation. I just think I'm messing up in the algebra.

2007-10-21 07:04:53 · 3 answers · asked by Anonymous in Mathematics