Science & Mathematics - 5 October 2007

So I am coming $5 off on my weighted average. I have recalculated it several times got to $1 off then $10 off....I am hoping someone can look at this and see what I did wrong....
Jan. 1 Beg. Inventory 600 @ $44 I calculate $26,400
Feb. 10 Purchased 100 @ $20 I calculate $ 2,000
March 13 Purchased 100 @ $20 I calculate $2000
Mar 15 sold 400 @ $75 I calculate $30,000
Aug. 21 purchased 160 @ $60 I calculate $9600
Sep. 5 purchased 280 @ $48 I calculate 13,440
Sep. 10 sold 200 @ $75 I calculate $15,000

My ending inventory balance is $34,060 and the book says it should be $34,055....

I am off $5 somewhere, everytime I change my calculations I come up with a different balance but never what the book states it should be...Please help

2007-10-05 10:01:42 · 3 answers · asked by Anonymous in Mathematics

I know that the derivative of a function represents the slope of the function at specific points. So I suppose I was wondering what, if any, information can be gained about the original function by looking at the second (or greater) derivative. Or, if the second derivative doesn't provide any insights into the original function, does knowing the slope of the slope of the function tell you anything?

This isn't for class or anything; we were doing higher derivatives in class, and I was just wondering if there was any point/reason for them.

2007-10-05 10:00:50 · 3 answers · asked by Some Guy 2 in Mathematics

I was thing about genetics in the eye color and fur color of mice or differnent types of food. I also read that supplements can make them fat, so I could do that maybe...any ideas?

2007-10-05 09:59:05 · 3 answers · asked by Anonymous in Zoology

A speeding motorist traveling 110 km/h passes a stationary police officer. The officer immediately begins pursuit at a constant acceleration of 10.2 km/h/s (note the mixed units).
(a) How much time will it take for the police officer to reach the speeder, assuming that the speeder maintains a constant speed?
_________s
(b) How fast will the police officer be traveling at this time?
_________km/h

2007-10-05 09:58:17 · 2 answers · asked by melon 1 in Physics

diver leavs a 10 m platform with forward horizontal velocity of 1 m/s and upward vertical velocity of 4 m/s. what is horizontal, vertical and resultant velocities of diver 0.25 s after she leaves the platform.

2007-10-05 09:57:42 · 1 answers · asked by keebler 1 in Mathematics

2007-10-05 09:57:03 · 3 answers · asked by roososs 2 in Physics

what is it made of?

2007-10-05 09:55:14 · 9 answers · asked by matissebradford 1 in Astronomy & Space

what is meant by second order? references please....

2007-10-05 09:54:43 · 2 answers · asked by babyCub 3 in Physics

2007-10-05 09:54:39 · 13 answers · asked by Beggars Belief 2 in Astronomy & Space

an 80 kg basketball player catches a pass in the air after landing immediately jumps to dunk. (vertical velocity is 3 m/s downward) and (vertical velocity is 4 m/s upward)

2007-10-05 09:51:53 · 1 answers · asked by keebler 1 in Physics

2007-10-05 09:51:51 · 5 answers · asked by Anonymous in Mathematics

An elevator of mass 800 kg acclerates at 3.0 m/s^2 Down. What is the force exerted on the elevator by the cable?

A 0.14 kg baseball requires a velocity of about 75 m/s in order to clear the fence in right field. What is te average net force applied to the ball by the bat if the ball was at rest when struck (on a tee) and is in contact with the bat for 6.0 x 10^-4 seconds?

A tennis racket, in contact with a ball (55 g) for 0.00050 s changes the ball's velocity from 30m/s [East] to 40 m/s [West]. What is the average force exerted on the ball by the racket?

A 0.25 kg model rocket acclerates from 15 m/s to 40 m/s in 0.60 s. Calculate the force(s) the escaping gases exert on the rocket?

A submarine rescue chamber has a mass of 8.2 tons (8200 kg) and safely descends at a constant velocity of 0.4 m/s, determine the force exerted by the bable and the water (buoyant force) on the chamber.

2007-10-05 09:51:01 · 2 answers · asked by Anonymous in Physics

Diagram Description:- there are 4 balls(mass A, B, C, D) and mass of each ball is 2.0kg and their arrangement is in a figure of a square set apart 10cm from each other< sorry couldn't draw figure

QUESTION >>>Find the magnitude of the net gravitational force on mass A

2007-10-05 09:50:12 · 2 answers · asked by Boojin 1 in Physics

does your house go on fire? last night it was lightning and thundering terrible and at 2:30 am a huge bolt of lightning struck and the whole house shook and flashed a blinding white. some things fell off of the shelves. then our alarm system went off very loudly. was our house struck by lightning????

2007-10-05 09:42:07 · 7 answers · asked by Anonymous in Weather

2007-10-05 09:41:42 · 11 answers · asked by Anonymous in Biology

2007-10-05 09:41:05 · 2 answers · asked by Anonymous in Chemistry

A retiree receives a payout from his Roth IRA where the taxes have already been paid.
He wants to take out 10% of the original amount at the beginning of each year for living expenses. The remaining money will earn 6% interest. How long before the money runs out?
For example, he starts with $400,000 and takes out $40,000 each year. The first year the interest would equal $360,000 * 6% or $21,600. So the second year would start with $381,000.
If you have a formula to put in a spreadsheet, it would help.

2007-10-05 09:39:21 · 3 answers · asked by Menehune 7 in Mathematics

A step-down transformer (turns ratio = 1:8) is used with an electric train to reduce the voltage from the wall receptacle to a value needed to operate the train. When the train is running, the current in the secondary coil is 1.6 A. What is the current in the primary coil?
_______________A

2007-10-05 09:38:20 · 1 answers · asked by Foxx 1 in Physics

What do u think should go on this space?

Hydrogen deuterium and tritium are isotopes.

Isotopes are BLANK of an element which contain the same number of BLANNK and BLANK but different numbers of BLANK.

2007-10-05 09:37:25 · 2 answers · asked by resord72 1 in Chemistry

how do you do the limit as x approaches infinity of arctan (x^5-x^-7)? Thanks

2007-10-05 09:36:22 · 2 answers · asked by ILuvTaraReid 2 in Mathematics

Find all positive intergers n (with n>1) for which n! is divisible by

n
sigma i
i=1

PS: I can't figure out how to express the sum symbol

what is the answer and how do u do it??

2007-10-05 09:33:25 · 2 answers · asked by dotadh 1 in Mathematics

i need help for my science project....

2007-10-05 09:30:57 · 3 answers · asked by M.D. 1 in Earth Sciences & Geology

2007-10-05 09:28:43 · 5 answers · asked by Ashleigh B 2 in Biology

What proof do you have?

2007-10-05 09:27:43 · 14 answers · asked by mikey 3 in Parapsychology

1) How long does it take for you hit the water if you drop off a high diving board which is 7.6 meters high?

2)What is your car's final velocity if you are initially going 6 m/s and then accelerate at 9.3 m/s2 for 0.60 seconds?

please solve them and explain how you solved.
Thanks

2007-10-05 09:27:39 · 1 answers · asked by Anonymous in Physics

Can anyone tell me what kind of spider this is? I've seen them for years,but I've never seen a picture of one before.They are a salmony color,with darker,maroonish legs.They tend to live under rocks and other dark,moist places.They are not terribly big,but sort of creepy - looking.I'll try to find one and take it's picture if no one knows what I'm talking about.I live in Ohio,if thet helps.

2007-10-05 09:27:36 · 2 answers · asked by Dances With Woofs! 7 in Zoology

Given:
Angle of Launch is Θ; 0° < Θ < 90°
Velocity of Launch is V
For simplicity, gravity causes objects to fall at 5t² meters, where t is the number of seconds the object has fallen.
No air/wind effects
Landing location is the same elevation as launch location on a flat plane.
Flight path is in 2 dimensions.

Express in terms of V and Θ:

Total number of seconds the rocket is in flight
Total number of meters the rocket travels horizontally
Total number of meters above ground the rocket reaches at its highest point

Thanks for your consideration!

2007-10-05 09:25:16 · 2 answers · asked by Timothy H 4 in Physics

2007-10-05 09:24:37 · 6 answers · asked by Jordan 2 in Physics

2007-10-05 09:17:50 · 6 answers · asked by Anonymous in Mathematics

2007-10-05 09:17:44 · 2 answers · asked by Anonymous in Geography