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Posts by peter

Total # Posts: 1,019

Chemistry
A volume of 70.0mL of aqueous potassium hydroxide(KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the solution if 19.2mL of 1.50M H2SO4 was needed? The equation is 2KOH+H2SO4->K2SO4+2H20

Chemistry
Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, , can be titrated against a solution of potassium permanganate, . The following equation represents the reaction: 2KMnO4+H202-> ...

Statistics
a. observations are from an F-distribution

chem
one isotope of carbon has the atomic # 6+ the mass #14. An Atom of this isotope contain how many elctrons

physics 2
A thin nonconducting rod is bent to form a semi-circle of radius R. A charge Q is uniformly distributed along the upper half and a charge -Q is uniformly distributed along the lower half, as shown int he sketch at the right.find E vector at P, the center of the semi-circle. ...

physics
A thin nonconducting rod is bent to form a semi-circle of radius R. A charge Q is uniformly distributed along the upper half and a charge -Q is uniformly distributed along the lower half, as shown int he sketch at the right.find E vector at P, the center of the semi-circle. ...

analogy
large is to small, feast is to

math
I would say its quite likely because it is greater than 50% but less than 100% (certain)

College Physics
A red car and a green car, identical except for color, move toward each other in adjacent lanes and parallel to an x-axis. At time t=0, the red car is at x sub r = 0 and the green car is at x sub g = 220m. If the red car has a constant velocity of 20km/h, the cars pass each ...

literature
I think its a sentence from Shakespeare's Sonnet 116.

math
15 dollers

biology
Research the sea lamprey, an exotic species that has had a great impact on the fish communities of the Great Lakes. a) Describe the niche of the sea lamprey. b) Find out how sea lampreys may have entered the Great Lakes ecosystem. c) Identify the interspecific interactions of ...

biology
Propose five possible solutions that will reduce the impact of human activities on the biogeochemical cycles.

biology
There is a bacteria called botulism which will grow in anaerobic conditions. This bacteria can be found in improperly canned food, as a result a toxin is produced which can be deadly to humans. What does this bacteria have to do with BOTOX?

research evaul 342
If the coefficient of correlation is –0.81, then the percentage of the variation in y that is explained by the regression line is 81%. A. True B. False

math
If x=6y, which of the following is a multiple of x? a. 12y b. 9y c. 5y d. 4y e. 3y

math
at a grand opening of a store, every 3rd person is given a balloon, and every 7th person is given a $5 coupon. if a person is selected at random from the first 100 people to shop there, whats the probability that the person will be given a balloon and a coupon? how do you do ...

math
between which two digits should a decimal point be placed so the value of the resulting number is 8.7654321 x 10^4 ?

math
if the lengths of triangle RST are r, s and t, where r=2, s=4, and t is an integer, what is one possible value of r+t/s?

math
what can x equal if 4 < 2x+1/x-3 < 7

math
72...didnt realize it was that simple

math
a man buying a new car can choose among 6 different colors, 3 different steering wheel styles, and 4 different audio packages? what is the total number of different combos he can choose?

math
7.5

math
the first term of a sequence of numbers is 4. each term after the first is 4 more than half the preceding term, what is the fourth term of the sequence?

Algebra
Collect like terms 12p+4q-5p-9q= I dont'know how to collect like terms, please help.

Algebra
Collect like terms 12p+4q-5p-9q=

statistics
Ok, so I'm trying to do this for my exam review. I get some of it, but not all: An electric utility is examining the relationship between temperature and electricity use in its service region on warm days. The utility has bivariate data detailing the maximum temperature (...

chemistry
suppose you mix 15 g of Na2SO4 and 7.5g of C.Which is the limiting reaction

calculus
A ladder 14 ft long rests against a vertical wall. Let \theta be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does x change with respect...

math
A ladder 14 ft long rests against a vertical wall. Let \theta be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does x change with respect...

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-...

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 ...

chemistry
Thank you!

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

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?

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. ...

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...

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.

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.

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

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 ...

chemistry
I am sorry it is in grams.

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!!

phys101
.2

engineering
I mean in Scientific notation?

engineering
What is the answer to part two??

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

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

Pre Calculus
Establish the identity tanx/2=cscx-cotx

calculus II
(4/9)^(n-.5)

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

chemistry
Qcal= CSP * (delta)T

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?

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

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 ...

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 ...

chem
228mL 452mL

Chem
How do I know what N is??

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!

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

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...

4th grade math
gfdxtttb avb c6

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.

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 - ...

AP Biology
biology

us history
Get a good knights sleep and then start

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

biology
no

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

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

9th grade biology
peeing liquid diraheea contracting chlorea

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.

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.

Math
12 and 60

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

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 ...

chemistry
how to get benzoic acid from a mixture of benzoic acid and salt?

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?

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.)

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

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 ...

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 ...

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 ...

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^...

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!

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.

Regression
anyone?

Regression
HELP Please

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 ...

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

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 ...

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

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

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.

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

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

spanish
how to say todays date in spanish

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...

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 ...

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

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