Science & Mathematics - 28 January 2007

i cant get it ! please show step by step, such as
5(2+1)
10+5
15

Thank You!

2007-01-28 11:39:46 · 9 answers · asked by kpajamas613 3 in Mathematics

Use cylindrical coordinates to find volume of the solid bounded by the paraboloid z=x^2+y^2 and the plane z=4.

2007-01-28 11:38:25 · 1 answers · asked by Astalav 1 in Mathematics

2007-01-28 11:37:39 · 1 answers · asked by GwenFals 1 in Biology

A man was attacked in a state park in California by a mountain lion. The park officials found and killed two lions after the attack. I'm trying to figure why that had to be done?

2007-01-28 11:37:39 · 11 answers · asked by Victor H 2 in Zoology

2007-01-28 11:37:21 · 4 answers · asked by envisiondreaming 2 in Mathematics

Calculate the pH of a .700 M NaC2H3O2.
Ka (HC2H3O2)=1.8*10^-5

the answer is 9.29 but i dont know how it was solved by the packet

2007-01-28 11:33:07 · 4 answers · asked by Anonymous in Chemistry

2007-01-28 11:33:06 · 2 answers · asked by Ms. Love 2 in Engineering

The shape has two arcs with the same center, and two straight line segments which would be part of radii of the circles. So the shape can be described by 'inner radius', 'outer radius', 'begin angle', 'end angle'.

2007-01-28 11:31:22 · 1 answers · asked by ultimatebaseclass 3 in Mathematics

2007-01-28 11:30:36 · 4 answers · asked by Ms. Love 2 in Engineering

1)-20.56 + r = -2.47
2)w - 8.44 = 30.15
3)6.54 - t = 10.2
4)x -5 1/3 = 2 1/2
5)-3 2/5 - y =6 1/5
6)z - 4 2/3 = -7 1/6

I hope the answers I wrote on my paper are right!!

2007-01-28 11:29:40 · 5 answers · asked by xxd0rkster 1 in Mathematics

Please only answer if you know what you're talking about. Why is Fluorine more reactive than Chlorine, for example?

2007-01-28 11:29:01 · 4 answers · asked by pinkcouture56 2 in Chemistry

Yosemite Falls 3 sections:Upper Fall, Middle Cascade Fall, Lower Fall. From footbridge across creek 2500 ft from falls, the angles of elevation to the top and bottom of Upper Fall are 45.74 deg and 24.42 deg, respectively. How high is the toal series of three falls? How high is Upper Fall? Round answers to nearest foot. Help pls. -

2007-01-28 11:28:55 · 1 answers · asked by Anonymous in Mathematics

2007-01-28 11:28:02 · 4 answers · asked by Anonymous in Physics

We live in a manufactured home that rests on cinder blocks and are building an addition which will also rest on cinder blocks. But are wondering how much weight can be supported by one block so we know how many to purchase.

2007-01-28 11:27:46 · 3 answers · asked by stephanie3133 1 in Engineering

you want to copy a poster whose dimensions are 24 inches by 30 inches onto a piece of paper 11 inches by 17 inches. You want the image as large as possible, but maintain the proportions of the original poster. What scaling factor will you use?

2007-01-28 11:26:53 · 3 answers · asked by Eugene D 1 in Mathematics

I have this theory that x1 and x2 are two different numbers. Both between pi/2 and pi. Such that

the interval over (x1,0) of cos(x)dx = 0.686
AND
the interval over (x2,0) of cos(x)dx = 0.686

I don't get this.

When I draw the graph of cos(x):
the only value for x, between pi and pi/2, that could possibly equal 0.686 is 0.814

The only other x value, between pi and pi/2, is 2.322. But this would give me a -0.686.

Then, I have to draw a graph, f, such that

The integral over (4,1) of f(x)dx = integral of (6,1) of f(x)dx.

Can someone help me understand this? What am I missing?

2007-01-28 11:25:31 · 1 answers · asked by ? 3 in Mathematics

to raise money for the school play, the theater club sold 150 tickets and took in a total of t dollars

if the club had sold 50 tickets more and decreased the ticket price by $1, it would've taken in a total of $900

What was the original ticket price?

2007-01-28 11:24:49 · 2 answers · asked by Anonymous in Mathematics

Ok Im solving quadratic equations and I have the equation

- ( k - 1 ) squared + 7 = - 43

so then I take the square root of ( k -1 ) squared so that it takes away the square of it

I need to know if once I do that, if the negative sign that I started out that was it front of the
(k-1) applies to both the k and the -1 or just the k or just the 1

like is it -k+1=50 or -k-1=50 or k-1=50

I meant for this to be easy but I cant find the square root sign and Im not sure if everyone knows what ^2 means.. I guess you should if you passed or are in algebra 2.. But anyways thanks for any help

2007-01-28 11:24:36 · 5 answers · asked by Rockell 3 in Mathematics

Find the future of an annuity with weekly deposits of 12$, made over a period of 5 years, with 3.8%interst compounded weekly?

2007-01-28 11:24:29 · 1 answers · asked by Eugene D 1 in Mathematics

A______ is invested by managers in a diversity of stocks, bonds, and other securities.
A. Series EE Bond.
B. Promissory Note.
C. Preferred Stock.
D. Mutual Fund.

2007-01-28 11:24:00 · 2 answers · asked by Lynn D 1 in Mathematics

I need to show that 4 is a divisor of (7^n) - (3^n) for every positive integer n. I think I need to use induction...
So far I have that when n = 1, 7-3 = 4 and 4|4 so the base case is true..
Then I assume that when n = k 4|[(7^k)-(3^k)] is true.
Then for n = k+1 I have (7^k)(7) - (3^k)(3) and I said that since 4|7-3 and also since 4|[(7^k) - (3^k)] then 4|[7^(k+1) - 3^(k+1)].

But is this correct? Or should I be stating it a little different?

Thanks!

2007-01-28 11:23:18 · 3 answers · asked by yogastar02 2 in Mathematics

How much would you have to invest each month in a annuity earning 6% monthly to earn $50,000 at the end of 30 years?

2007-01-28 11:22:32 · 1 answers · asked by Eugene D 1 in Mathematics

state the property that is illustrated in each statement.All variables represent real numbers?

(7.) (x+y)=5=5=(x=y)
(8.) 5(-x)=5(2)=5(-x)

2007-01-28 11:22:25 · 1 answers · asked by king 1 in Mathematics

19. A master plan is devised for?
A. Emergencies.
B. Investments.
C. Short-Term Goals.
D. Long-Range Goals.

2007-01-28 11:22:12 · 2 answers · asked by Lynn D 1 in Mathematics

Yvette takes out a conventional loan to purchase a car. The interest rate is 6.2% compounded monthly and Yvette has five years to repay the $9600 she borrowed. What are Yvettes payments?

2007-01-28 11:20:50 · 1 answers · asked by Eugene D 1 in Mathematics

If the annual interest is $475, how much did she invest at 10%?

2007-01-28 11:19:08 · 3 answers · asked by Anonymous in Mathematics

I have been wondering if our government is trying to develope energy weapons that do not rely on projectiles such as bullets, bombs, missles etc...And some kind of invisible protective shielding made of energy. Any thoughts on this people?

2007-01-28 11:16:18 · 6 answers · asked by garden witch 2 in Physics

In doing an experiment, i found that mold wouldnt grow on Quaker breakfast cookies. I asked my biology teacher and he said that it had something to do with the preservatives in them. I found the preservative potassium sorbate in the breakfast cookies but can anyone tell me what it is doing so that mold won't grow on it???

2007-01-28 11:16:08 · 2 answers · asked by Sarah 2 in Chemistry

2007-01-28 11:15:44 · 14 answers · asked by cylo1818 3 in Chemistry

Could someone please explain this to me in laymans terms??? I don't understand it and I need to know it for my chem class.

2007-01-28 11:15:33 · 3 answers · asked by Amaya 3 in Chemistry