Sunday
December 4, 2016

Posts by peter

Total # Posts: 988

statistics
(a)Comparison of GPA for randomly chosen college juniors and seniors: xbar= 3.05, s1 = .20, n1 = 15, xbar2= 3.25, s2 = .30, n2 = 15, á = .025, left-tailed test. calculate d.f. ____________ Standard error ____________ t-calculated ____________ p-value ____________ t-...
April 29, 2010

criminal law
As a computing investigator for your local sheriff’s department, you have been asked to go with a detective to a local school that received a bomb threat in an anonymous email. The detective already has information from a subpoena sent to the last know ISP where the ...
April 28, 2010

chemistry
Thank you!
April 27, 2010

chemistry
What are the missing nuclear symbols for the bombardment reation? 25/13Al + 30/15? >>> 30/15P + 1/0n
April 27, 2010

chemistry
The half-life of stronitum-90 is 28 years. How many grams of this nuclide in a 4.00g sample will remain after 112 years?
April 27, 2010

math
A compressed high resolution chest xray image requires about 8MB of data. most GP surgeries are connected to the NHS network at a speed of 100Mbps. how long would it take to download a set of 6 images. give your answer to second to 2 decimal places using scientific notation. ...
April 27, 2010

engineering
A compressed high resolution chest xray image requires about 8MB of data. most GP surgeries are connected to the NHS network at a speed of 100Mbps. how long would it take to download a set of 6 images. give your answer to second to 2 decimal places using scientific notation. I...
April 26, 2010

engineering
To be honest I can make sense of that bit you pointed out. It’s actually the scientific notation bit I struggle with. The answer is 3.84 seconds, however how do you get the answer in seconds, to two decimal places using scientific notation?? Thanks, Peter.
April 26, 2010

engineering
A compressed high resolution chest xray image requires about 8MB of data. most GP surgeries are connected to the NHS network at a speed of 100Mbps. how long would it take to download a set of 6 images. give your answer to second to 2 decimal places using scientific notation.
April 26, 2010

chemistry
Im sorry can you explain that? So is the concentration of NaOH .03?
April 22, 2010

chemistry
If you wanted to standardize an approximately 0.1 M solution of hydrochloric acid by titrating 10.00 mL (delivered from a pipet)with approximately 30mL of sodium hydroxide solution (delivered from a buret), what should be the approximate concentration of the sodium hydroxide ...
April 22, 2010

chemistry
I am sorry it is in grams.
April 19, 2010

chemistry
At 1285 degree C the equilibrium constant for the reactin Br2(g) <> 2Br(g) is Keq= 1.04 * 10^-3. A 0.200 L vessel containing an equilibrium mixture of the gases has 0.245 Br2(g) in it. What is the mass of Br(g) in the vessel? Please help, Thanks!!
April 19, 2010

phys101
.2
April 19, 2010

engineering
I mean in Scientific notation?
April 17, 2010

engineering
What is the answer to part two??
April 17, 2010

geometry
find the area of the trapezoid whose diagonals are 30 each and height of 18? I spent 2 hrs and I can't figure it out Pls. help 408-887-2612
April 16, 2010

Pre Calculus
Establish the identity (cosx/2-sinx/2)^2=1-sin x
April 15, 2010

Pre Calculus
Establish the identity tanx/2=cscx-cotx
April 15, 2010

calculus II
(4/9)^(n-.5)
April 11, 2010

math 3
If Lynn can type a page in p minutes, what piece of the page can she do in 5 minutes?
April 10, 2010

chemistry
Qcal= CSP * (delta)T
April 6, 2010

math
A painter needs to cover a triangular region 62 meters by 66 meters by 71 meters. A can of paint covers 70 square meters. How many cans will be needed?
March 31, 2010

chemistry
What is the equation of the preparation of K3[Al(C2O4)3].3H2O using Al2(SO4)3?
March 24, 2010

Statistics
T-Test The article “Does Smoking Cessation Lead to Weight Gain?” described an experiment in which 322 subjects, selected at random from those show successfully participated in a program to quit smoking were weighed at the beginning of the program and again one year ...
March 18, 2010

business math
It's a lot of words, but short questions. I got most of it, but I'm confused on a and c. Help would be greatly appreciated: Theater Seven wants to increase its popularity. They want to determine the best number of newspaper (N), Radio (R), and Television (T) ads to ...
March 14, 2010

chem
228mL 452mL
March 14, 2010

Chem
How do I know what N is??
March 9, 2010

Chem
A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight of the gas? Thanks!
March 9, 2010

Chem
Is there an easy way to re-write PV=nRT so that it equates density with molar mass?
March 8, 2010

Calculus
The manager of a 100 unit apartment complex knows from experience that all units will be occupied if the rent is $500 per month. A market survey suggests that, on average, one additional unit will remain vacant for each $10 increase in rent. What rent should the manager charge...
March 2, 2010

4th grade math
gfdxtttb avb c6
February 17, 2010

English
I am asked to describe the "syntax" of a book I am reading. I have looked up several definitions of the word and still do not understand what it means.
January 24, 2010

english
- Computers - English - Foreign Languages - Health - Home Economics - Math - Music - Physical Education - Science - Social Studies GRADE LEVELS - Preschool - Kindergarten - Elementary School - 1st Grade - 2nd Grade - 3rd Grade - 4th Grade - 5th Grade - 6th Grade - 7th Grade - ...
January 8, 2010

AP Biology
biology
January 8, 2010

us history
Get a good knights sleep and then start
January 8, 2010

spanish
what does these sentence say 1. Rufo/llegar temprano a la clase de matematicas 2. Nico y Gilda/ usar la computadora en la clase de historia
January 7, 2010

biology
no
January 7, 2010

biology
How are sperm and egg cells formed? Describe in general terms what happens during meiosis.
January 7, 2010

MATH ANALYSIS
its simple, all you do is type it into the calculator
January 7, 2010

9th grade biology
peeing liquid diraheea contracting chlorea
January 7, 2010

Algebra 1A
Translate Two dollars plus four cents times the number of minutes in part into a symbolic rule. Use c to represent the total monthly cost and n to represent the total number of long-distance minutes for the month.
December 2, 2009

MAT 116 Algebra 1A
A long-distance telephone plan costs $2.00 a month, plus 4 cents per minutes, or part thereof, for any long-distance call made during the month. Write a verbal rule to determine the total monthly cost for your long-distance calls for the month.
December 2, 2009

Math
12 and 60
November 30, 2009

Trigonometry
What's the easiest way to remember how to draw the graphs for the common trigonometric functions, like sin cos and tan?
November 18, 2009

math
Think of it like a right triangle. The distance horizontally is 4 (from -1 to 3). The distance vertically is 6 (from -1 to -7). You know the formula a^2 + b^2 = c^2 with c being the hypotenuse. Therefore, 4^2 + 6^2 = c^2 and c is the distance between the points. 16 + 36 = c^2 ...
November 18, 2009

chemistry
how to get benzoic acid from a mixture of benzoic acid and salt?
November 14, 2009

Calculus
A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 1.5 m/s, how fast is the length of his shadow on the building decreasing when he is 4 m from the building?
November 8, 2009

Calc
A plane flying horizontally at an altitude of 1 mi and a speed of 510 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 6 mi away from the station. (Round to the nearest whole number.)
November 8, 2009

Chemistry
a 22.5g sample of (NH4)2CO3 (ammonium carbonate) contains_____ moles of ammonium ions. A. o.468 b. 0.288 C. 0.234 d. 2.14 e. 3.47
November 1, 2009

finance
John Keene recently invested $3,500 in a project that is promising to return 10.75 percent per year. The cash flows are expected to be as follows: End of Cash Year Flow 1 $750 2 800 3 ??? 4 950 Note that the 3rd year cash flow is unknown. Assuming the present value of this ...
October 23, 2009

physics
On a cold winter morning, a child sits on a sled resting on smooth ice. When the 9.10 kg sled is pulled with a horizontal force of 36.0 N, it begins to move with an acceleration of 2.10 m/s^2. The 25.0 kg child accelerates too, but with a smaller acceleration than that of the ...
October 11, 2009

Algebra
When you're breaking down the square root in the quadratic formula into several parts- say it was the originally the square root of 80 so you break it down to square root of 4 and square root of 20-would the results be added or multiplyed? Because I know when you further ...
October 5, 2009

Algebra
A winch is used to tow a boat to a dock. The rope is attached to the boat at a point 15 feet below the level of the winch. Find the distance from the boat to the dock when there is 75 feet of rope out. I got 15^2+75^2=X^2. I put a square root around each side so I got 15+75=X^...
October 5, 2009

Algebra
I'm trying to solve this Pythagorean Theorom problem. x^2+(2x^2)=32^2 which becomes 5x^2=1024 I don't get how the x^2 and the 2x^2 combine to get 5x^2. I think it should be 3x^2. Can you explain? Thanks!
October 5, 2009

8th grade
Direct Variation: when you have a job that pays an hourly wage, the amount you earn varies directly with the number of hours you work. Suppose you earn $7.10/ hour working at the library.
October 3, 2009

Regression
anyone?
September 30, 2009

Regression
HELP Please
September 30, 2009

Regression
1)Price of COke 2)Price of Pizza 3)Price of Beef 4)Quantity of Beef 5)Income 1) List and explain each of the components of you regression model, both the dependent and independent variables 2) list each of the indepedent variables, and hypothesize the sign of coefficients and ...
September 30, 2009

Regression Analysis
-Quantity of Beef -Price of Beef -Price of Pizza -Price of Coke -Income What are the independent and dependent variables with regards to independent hypothesize the sign
September 30, 2009

Regression Analysis
1)Quantity of Beef 2)Price of Beef 3)Price of Pizza 4)Price of Coke 5)Income 1- list and explain each of the components of your regression model, both the dependent variable and the independent variables 2-list each of the independent variables, hypothesize the sign of the ...
September 30, 2009

calculus
is square root x^4-4-y=0 and x^2+y^2=4 a function
September 29, 2009

senior project
How can I do a good senior project about obesity in america? what are some things i can do? how can i do community service about it? what are some other ways i can make it unique and different from others? need more ideas please
September 27, 2009

Math
Hi, I wanted to know how can I donwload "B2K - Badaboom (featuring Fabolous)/Take It To The Floor" file from your site. Where do I click? Thanks.
September 25, 2009

chemistry.
What is the empirical formula of a hydrocarbon that contains 89,94% by mass?
September 25, 2009

chemistry.
What is the empirical formula of a hydrocarbon that contains 89,94 by mass?
September 25, 2009

spanish
how to say todays date in spanish
September 23, 2009

world history
define... 1- assets 2- intervening 3- haciendas 4- nationalization 5- revolution short answer 1- what political and economic factors helped cause the Mexican Revolution ? 2- Explain how the constitution of 1917 tried to resolve some of the problems that started the revolution...
September 14, 2009

Finance
You belong to an unusual pension plan because your retirement payments will continue forever (and will go to your descendants after you die). If you will receive $30,000 per year at the end of each year starting 25 years from now, what is the present value of your retirement ...
September 10, 2009

principles of design
i don't get the principles of design. what are pattern, rhythm, unity, movement, emphasis, contrast, and balence. please help.
September 9, 2009

art
thank you
September 9, 2009

art
i don't get the principles of design.i mean, what does pattern, rhythem, unity, movement, emphasis, and contrast REALLY mean? i am a seventh grader seeking answers and EXAMPLES.
September 9, 2009

Science
Is a Trypanosoma Brucei a Flagellate, Ciliate, Amoeba, or Sprozoan?
July 11, 2009

trig
Solve for X. Leave answers in logarithmic forms. 3^(2-x) = 2^x Thanks.
June 16, 2009

chemistry help
NAME A UNIT OF CONCENTRATION COMMONLY USED TO EXPRESS SMALL CONCENTRARTIONS?
May 18, 2009

chemistry
yes can you just guide me through this one and it will be the last
May 8, 2009

chemistry
A 900.0 g sample of sea water is found to contain 6.7 x 10-3 g Zn. Express this concentration in parts per million?
May 8, 2009

chemistry
A sample of 300.0g of drinking wtare is found to cntain 38 mg Pb. What is this concentration in parts per million?
May 8, 2009

pre calc asap
ok i see now
May 7, 2009

pre calc asap
what do you mean?
May 7, 2009

pre calc asap
what is the domain and range of f(x) =x^2
May 7, 2009

chemistry?
why might we use it??
May 4, 2009

chemistry
this is something like the answer should be
May 4, 2009

chemistry
What is a serial dilution and why might you want to use it?
May 4, 2009

algebra need help
yes that's what I mean
April 30, 2009

algebra need help
Add. 4m^2yp + 6/m^y
April 30, 2009

algebra
Add. 4m^2yp + 6/m^y
April 30, 2009

algebra
Add. 4m^2yp + 6/m^y
April 30, 2009

U.S Constitution
it sets forth laws, justice, peace and people in the future. The people themseleves like you or I are responsible for it. can you tell me more??
April 27, 2009

U.S Constitution
Identify each of the responsibilities the Preamble set forth. Who is responsible for them?
April 27, 2009

chemistry help
Why is hydrogen peroxide very soluble in water?
April 21, 2009

chemistry need help
Contrast ionic and molecular substances in terms of the types of attractive forces that govern their behavior.
April 21, 2009

Chemistry
What would the two half reactions be for 2Na+1MgBr2 arrow 2NaBr + Mg? I don't know how to determine this, other than that you separate the elements for the two half reactions. My other question is that when you're translating words and you have an element with Roman ...
April 19, 2009

history
just take the important things and just talk about it.
April 17, 2009

math6
840
April 16, 2009

Math
I think it's D.
April 16, 2009

Math
I used this equation 7500/120000=150000/x.
April 16, 2009

Math
i got $9,375.
April 16, 2009

CHEM
HCOOH + OH- --> COOH- + H20 Kb = [OH-][HCOOH]/[COOH-] = x^2/(0.0714-x) = 5.55 x 10^-11 x=1.99 x 10^-6 pOH = 5.70 pH = 14 - 5.70 = 8.30 ^ Will that also work?
April 6, 2009

CHEM
Calculate the pH of solution made by combining 75.0 mL of 0.10 M formic acid with 30.0 mL of 0.25 M KOH. (Ka for formic acid, HCOOH, is 1.8 X 10^-4)
April 6, 2009

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