Science & Mathematics - 29 October 2007

2x = 12 – 2y and 6y = 36 – 6x
The teacher offered $20 to the first student to solve these equations for x and y. Just how generous was the teachers offer? Show working.

2007-10-29 19:48:38 · 11 answers · asked by Josh M 1 in Mathematics

I have this assignment to come up with a design of a robot that is 6 inches wide. It has to climb 4 stairs 4 inchs up, 6 inches in depth, and 2 ft across. it has to since a line perpendicular to the riser before moving to the second step, a 2 inch hole beofre moving to the third step, and the a red led light before moving to the fourth and final step. this cannot leave the surface so it rules out going air born, and it has to be fully autonomous. We can use any vex parts, so others if we can justify it, but there is not point in transmitters since we cant use a remote controll.. I can seem to think of a good design I feel confident would complete the task of climbing the stairs and finding this things all on its own. any help ya'll could offer me would be great! thanks

2007-10-29 19:45:29 · 1 answers · asked by Scottyman2002 2 in Engineering

2007-10-29 19:41:25 · 11 answers · asked by mugen_ex 1 in Engineering

y s rangitoto such a different shape to taranaki???

wat r the problems with da crater lake on ruapehu???
discuss the problems in managing this.

2007-10-29 19:41:22 · 5 answers · asked by kewlestgirl 2 in Earth Sciences & Geology

2007-10-29 19:39:04 · 9 answers · asked by Anonymous in Physics

How many milliliters of 0.210M HCl are needed to neutralize completely 35.0ml of 0.101M Ba(OH)2 solution?

2007-10-29 19:33:24 · 2 answers · asked by Anonymous in Chemistry

on the surface of Jupiter?

2007-10-29 19:32:29 · 3 answers · asked by Xquisite Shawtey 1 in Physics

can you help me find what the inverse laplace of the following is please ?

1/[s(s^2 + s + 1)] + s/(s^2 + s + 1) + 1/(s^2 + s + 1)

2007-10-29 19:30:38 · 1 answers · asked by phil h 2 in Mathematics

2007-10-29 19:29:10 · 5 answers · asked by Anonymous in Biology

2007-10-29 19:26:02 · 5 answers · asked by darcyaf1 3 in Geography

2007-10-29 19:06:26 · 9 answers · asked by Anonymous in Biology

Would you buy a MAC or a PC. For the same ammount of the UAD (Universe Alien Dollars)?

2007-10-29 18:57:34 · 8 answers · asked by khaldooni 2 in Astronomy & Space

please help

2007-10-29 18:55:32 · 2 answers · asked by Anas S 1 in Engineering

Any will do. :D

2007-10-29 18:55:06 · 6 answers · asked by YannicH 2 in Biology

Is anything overly safe?
.

2007-10-29 18:52:27 · 16 answers · asked by Anonymous in Biology

given by v(t) = -1 + e^(1-t).
(a) Find the acceleration of the particle at time t = 3
(b) Is the speed of the particle increasing at time t = 3? Give a reason for your answer.
(c) Find all values of t at which the particle changes direction. Justify your answer.
(d) Find the total distance traveled by the particle over the time interval 0 is less than or equal to t is less than or equal to 3.

2007-10-29 18:35:10 · 3 answers · asked by help! 1 in Physics

If an object is dropped, the distance it falls is given by D=1/2gt^2 where g is about 32 ft. If this is correct explain why..if not explain why and give correct method!

oh ya and the number after ^ is the exponet just to letcha kno

2007-10-29 18:30:07 · 2 answers · asked by Anonymous in Mathematics

A 2.5 kg cart, moving along the x-axis with constant acceleration, crosses the origin at t=0 with velocity 4.0 m/s to the left. What must be the net force on the cart if some time later it is moving to the right at velocity 12 m/s at position +10 m?
please asap
thank you

2007-10-29 18:24:10 · 1 answers · asked by Anonymous in Physics

2007-10-29 18:23:29 · 2 answers · asked by rubie s 1 in Biology

2x-5=height
3(4+x)= length

if the perimeter of the rectangle is less than 52, find all possible values for x.

2007-10-29 18:18:42 · 10 answers · asked by nikkecola17 3 in Mathematics

2007-10-29 18:18:04 · 3 answers · asked by mceb 1 in Chemistry

Question: Suppose you know that the series SUM(bn) from n=1 to infinity converges. What can you say about the series SUM(bn^n) from n=1 to infinity?
Answer: I believe the series converges absolutely by the ROOT test since limit |bn|=0 as n goes to infinity for a convergent series.

2007-10-29 18:13:30 · 3 answers · asked by curious 2 in Mathematics

stab at it! Thanks!

Solve each irrational equation. If an equation has no solution, so state:
a. 3/x - 1/6 = 1/x
b. 13/y-1 - 3 = 1/y-1

A car travels 60 miles in the same time that a car traveling 10 per hour faster travels 90 miles. What is the rate of each cars?

Find the indicated root or state that the expression is not a real number:
a. 3sqrt8/125 This is the cube root of 8/125
b. -4sqrt81

Simplify each expression:
a. sqrt45x^23
b. sqrt96/3

Add or subtract as indicated:
a. 4sqrt72 - 2sqrt48
b. sqrt75 - sqrt48

Multiply as indicated:
a. (√11 - √ 5 ) (√11 +√ 5)
b. ( 1 + √2)^2

Solve each radical expression:
a. 64^2/3
b. (-8 )^-4/3

Solve by completing the square:
X^2 –12X + 27 = 0

Solve by using the quadratic formula:
a. X^2 = 2X + 4

Solve each equation:
a. X^2 = -100
b.5X^2 = -125

2007-10-29 18:13:16 · 1 answers · asked by Anonymous in Mathematics

average velocity after t seconds of a falling object differs among celestial bodies.

earth -4.9t m/s
moon -.83t m/s
jupiter -11.44t m/s

suppose an object is dropped from 100 meter tall structures on the moon, earth and on jupiter write parametric representations of each motion

2007-10-29 18:08:38 · 1 answers · asked by Anonymous in Mathematics

solve the equation on the intervel of 0 < equal to theta < 2 pi

a) cos^2 theta - sin ^2 theta + sin theta = 0

b) cos (2 theta) + 4 cos theta +3 = 0

please help me and explain this step by step, thanks

2007-10-29 18:08:21 · 2 answers · asked by Anonymous in Mathematics

2007-10-29 18:07:09 · 2 answers · asked by Anikin 1 in Physics

Does anybody know how to do the nonlinear regression in Excel?

2007-10-29 18:07:05 · 2 answers · asked by Anonymous in Mathematics

It's an AWFUL burden to carry. Why would you want it???

2007-10-29 18:05:48 · 17 answers · asked by Deenie 6 in Paranormal Phenomena

I’m looking for a short list of the best places in the West (California, Utah, Nevada, Oregon, Idaho, Montana, Wyoming, Hawaii, and Alaska) for the novice or family to go stargazing. Any ideas? These places should be fairly accessible to the average family and offer facilities or programs for the stargazing beginner/novice. These places can be observatories, national parks, dark but accessible regions, star parties/events, etc.

Second, I’m looking for a longer list of places specifically for California.

Finally, are there any important astronomical events happening in January or February that novices should know about (Mars, meteor shower, etc.)?

Thank you for your ideas!!

2007-10-29 18:05:39 · 7 answers · asked by prbfc 5 in Astronomy & Space

The big fire in Southern California got me really thinking of fire prevention. As a country we have been practising fire surpression for almost a century. Should we have a better fire prevention program? I mean, one from the grass root? Can I lit a fire in my backyard when I know a big wet storm in coming?

2007-10-29 18:00:46 · 4 answers · asked by Anonymous in Engineering