Science & Mathematics - 6 September 2007

Use the daily balance method.

A customer's charge account shows a balance of $390 on January 1. A payment of $100 was made on January 16. Purchases of $190 were made on January 23. An annual rate of 19.5% is applied to the account.

A) What is the average daily balance?
a. $393.55
b. $423.35
c. $386.45
d. $742.25

B) What is the finance charges on this account?
a. $7.31
b. $8.61
c. $6.39
d. $4.31

Thank you so much for your help. My husband, who is currently serving in Iraq, is the household mathwiz. Please explain, if you can, how you got your answer so that I may explain it to my son.

TIA

2007-09-06 16:06:43 · 5 answers · asked by Anonymous in Mathematics

2007-09-06 16:04:53 · 15 answers · asked by animalhouser07 2 in Mathematics

2007-09-06 16:03:30 · 5 answers · asked by Anonymous in Geography

Can someone please help me figure out if my answer is correct.

Question:
What is the echo time if I snare a drum in the hall outside the room which is 80 meters long. The average echo time was 10 milliseconds. Use Echo Ranging formula to prove or disprove my findings, remember this echo was heard in air.

My answer:
I wrote formula d= r x t
d= 160m ( because 80x 2) the sound must travel back
t= 10 ms = 0.01 seconds
c = 16000m/s ( answer)

Under ideal conditions, this appears to be wrong. As the speed of sound in air travels 344m/s in dry air (temperature of 20 °C (68 °F)). So either the time or the distance measurements are incorrect.

2007-09-06 16:03:07 · 1 answers · asked by julie p 1 in Physics

Okay I really need some help with my Calculus homework I don't get any of these problems:

1) lim x->0 tan^2x / x

2) lim x-> pi x sec x

3) lim x-> pi/4 1-tanx / sinx-cosx

4) lim x-> 0 cosx-1 / 2x^2

5) lim x->0 sinx / cube rt. of x

I would really appreciate your help on any of these problems, please show steps so I understand what you are doing.

2007-09-06 16:01:45 · 2 answers · asked by gigi_victory 3 in Mathematics

what is pressure energy,heat energy,potential energy, and kinetic energy?
I am confused between those terms?Please explain me the difference?
Does pressure energy is potential energy?In what way?
Is heat energy related to potential energy and kinetic energy?In what way?
Is potential energy is there for steam?
Thanking you!!!

2007-09-06 15:59:16 · 1 answers · asked by C P 1 in Physics

I need this a simplifyed as you can please!

10t+4(1-3t)

2007-09-06 15:58:01 · 7 answers · asked by luckeynat3 1 in Mathematics

2007-09-06 15:55:55 · 2 answers · asked by Anonymous in Zoology

Is this a hypotheses, prediction or a theory?

2007-09-06 15:52:01 · 2 answers · asked by Stuff 3 in Other - Science

You travel 60 kilometers in 1.5 hours. What is your average speed?

2007-09-06 15:50:25 · 9 answers · asked by Anonymous in Mathematics

write the following half equations .
ethanol to acetic acid (oxidation) ---------- > (1)
oxygen to water (reduction)----------------->(2)

Add (1) and (2)
can you please teme the answers for the addition of both the equation and how to go about doing it.

thank you

2007-09-06 15:48:27 · 1 answers · asked by pups 3 in Chemistry

PLEASE EXPLAIN?...........THANKYOU SO MUCH!!!!!!!FOR ALL YOUR HELP!!!

2007-09-06 15:48:08 · 8 answers · asked by Kim 1 in Mathematics

How do you graph it? like what are the coordinates. cuz all i see is 0 for both.

2007-09-06 15:46:46 · 12 answers · asked by Anonymous in Mathematics

is speed distance or time??

2007-09-06 15:45:07 · 7 answers · asked by Anonymous in Physics

(³√2x+1)+8=0

2007-09-06 15:45:06 · 3 answers · asked by EsMyNuM1 2 in Mathematics

Sum of infinite series: convergent or divergent?
sum from x=2 to ∞ of 1/(x ln x)

How do I show whether this is convergent or divergent?

I do not need to find the sum if it is convergent. I just need to know how to show convergence or divergence.

2007-09-06 15:44:38 · 3 answers · asked by Anonymous in Mathematics

Where can you find the answer to this question?
Solar Energy is released from the photosphere of the sun. What part is the photosphere?
Also do you know the answer?

2007-09-06 15:43:22 · 6 answers · asked by Anonymous in Astronomy & Space

2007-09-06 15:42:52 · 4 answers · asked by Anonymous in Biology

No

2007-09-06 15:40:35 · 12 answers · asked by Anonymous in Astronomy & Space

2007-09-06 15:38:12 · 1 answers · asked by ags101 2 in Physics

A rock is thrown vertically upward with a speed of 18.0m/s from the roof of a building that is 70.0m above the ground. Assume free fall.

In how many seconds after being thrown does the rock strike the ground?

What is the speed of the rock just before it strikes the ground?

2007-09-06 15:36:09 · 2 answers · asked by ! 2 in Physics

Thinking about why tornados form and how/why certain kinds of volcanos form, the processes for -certain- kinds of each can be similar. Tornados form the funnel when a storm cell starts spinning and one end of it sinks as the cool air from above mixes with it and "erupts" from the bottom of the tornado into the world below, the air spinning around as it does. Some kinds of volcanos form when a magma cell starts spinning and hotter magma from deeper within the earth pushes its way upwards, "erupting" through the resulting upside-down funnel.

It's not true of all volcanoes nor of all tornados, but _some_ seems to be similar phenomenon in different media. Is there any validity to this notion?

2007-09-06 15:33:19 · 5 answers · asked by uncleclover 5 in Weather

what is autopsy and how do i becomeone and what are the recruiments? i am looking for best answers and rating

2007-09-06 15:31:40 · 9 answers · asked by sharoz s 1 in Medicine

Just share any of your theories on how evolution can be disproved...I'm interested in hearing all of your input!

2007-09-06 15:30:12 · 13 answers · asked by aspyke13 1 in Biology

F(1) = 3
F(3) = 9
F(6) = 27
F(10) = 81
F(15) = 243
etc...
and the pattern repeats to infinity.

2007-09-06 15:27:32 · 1 answers · asked by ? 3 in Mathematics

Is there an easy way to calculate pH when given the M concentration of a compound as well as its amount in liters?

2007-09-06 15:24:12 · 2 answers · asked by Anonymous in Chemistry

Three sailors were marooned on a deserted island that was also inhabited by a band of monkeys. The sailors worked all day to collect coconuts but were too tired that night to count them, They agreed to divide them equally the next morning.
During the night, one sailor woke up and decided to get his share. He found that he could make three equal piles, with one coconut left over, which he threw to the monkeys. Thereupon, he had his own share and left the remainder in a single pile.

Later that night, the second sailor awoke and, likewise, decided to get his share of coconuts. He also was able to make three equal piles, with one coconut left over, which he threw to the monkeys.

Somewhat later, the third sailor awoke and did exactly the same thing with the remaining coconuts.

In the morning, all three sailors noticed that the pile was considerably smaller, but each thought that he knew why and said nothing. When they then divided the remaining coconuts equally, each sailor received seven and one was left over, which they threw to the monkeys.

How many coconuts were in the original pile?

2007-09-06 15:20:54 · 3 answers · asked by CactusGirl 1 in Mathematics

can u please tell me were the
solar system
the sun
and the asteroid belt
fall into dis order.



mercury
venus
earth
mars
jupiter
saturn
uranus
neptune

2007-09-06 15:20:32 · 6 answers · asked by Anonymous in Astronomy & Space

Winnipeg used 6.5 million sandbags to hold back the flood. Each sandbag was about 10 cm thick. About high would a stack of 6.5 million sandbags be in centimetres? metres? kilometres?

2007-09-06 15:17:18 · 6 answers · asked by Stargirl 3 in Mathematics

2007-09-06 15:15:22 · 8 answers · asked by Kim 1 in Mathematics