Wednesday
July 30, 2014

Posts by MaryAnne


Total # Posts: 33

Trigonometry
If sin A = 3/5 and cos B = 24/25 and <A and <B are both in quadrant 1, what is the exact value of cos (A-B) ? Help please

Derivatives
with respect to x f(cos x) if f'(x)= 1/x find (f(cos x))' i got tan x sec x this is wrong. can you explain thank you

Derivative
Find dy/dx for the following: 1) x^3 + 3x^2*y + y^3 = 4 I get -3(x+2y)/x^2 + y^2 it's wrong though. 2) x + y^2= xy^2 I get y^2 + 1/ 2y- 2xy this is also wrong. can you explain thanks

CHEMISTRY
Suppose you had a detection device that could count every decay event from a radioactive sample of plutonium-239.052156 (t1/2 is 24,000 yr). How many counts per second would you obtain from a sample containing 0.126 g of plutonium-239? (The mass of Pu-239 is 239.052156 u. Assu...

Soial Work
Discuss a case fro the NM court which has used a ruling involving the Tarasoff case

HIS 103
why didn't Byzantium have much more cultural influence farther west, rather than in eastern and southeastern Europe?

HIS 103
What made Byzantium "Roman" other than its formerly being part of the Roman Empire? How Roman was it when it spoke Greek and, after the 11th century, was no longer Catholic?

HIS 103
Good overview; how did Eastern Orthodox Christianity (which split from the Catholic Church in the mid-11th century) differ from Rome in its basic concepts and worship style?

HIS 103
Was a more fluid social structure, with more change and mobility somehow not diserable in the caste system

Math and Society
Which solid has the greatest volume? a)A right cylindrical cylinder with a radius of 4 inches; b)A cube with a side of length of 4 inches; or c) a sphere with a radius of 4 inches?

microbiology
Lactobacillus species ferment glucose, as demonstrated by the snyder test. What other metabolic functions might they perform judging by the list of ingredients: Yeast extract, agar, sodium chloride, pancreatic digestive casein. Thank you

Chemistry
If a 6.00M solution of sodium hydroxide occupies 520 mL of space how many grams of NaOH is dissolved in the solution? (Remember M = moles/L). And the work.

Chemistry
The density of oak lumber is approximately 800km/m^3. What is the mass in grams of 4 cubic meters of oak? And the work.

Chemistry
What is the mass in grams of 4.556 x 10^30 lead atoms? Also the work.

health fraud- hair products
ok so i have to pick a product basically that is like a fraud and it has to be a hair product. then i have to write a summary about it. so i was thinking a product that claims it can grow hair and stop hair lose. Does anyone know of any products like that, that are pretty famo...

math
oh its a rhombus! Thank you!

math
provide a counterexample to show that each statement is false. a) if a four sided figure has four congruent sides, then it has for right angles. at first i thought of a trapezoid proves that wrong but then i remembered only 2 sides have to be congruent for that.

conformity paper
Just to say first im not wanting anyone to write my paper for me. I have to write an english paper about non conformity and conformity. I already have a load of information but Im looking for a little more. directions:observe conformity as it exists in your society. Note how p...

chemistry
28.06 mL to grams

chemistry
to DrBob222 wouldn't it be like this then 4.86L/12.75kg*1000cm^3/1L*(1kg/1000g)^3

chemistry
An aluminum engine block has a volume of 4.86 L and a mass of 12.75 kg. What is the density of the aluminum in grams per cubic centimeter?

physics
What is the total resistance in a parallel circuit with a 10 ohm lamp and a 15 ohm lamp?

Social Studies.\ASAP PLEASE
What factors shaped the move from colonial, country life to modern, urban life? What was urban city life like during the rise of urbanization? How was it different or similar to modern urban life? Can you help me? I have not heard from my teacher about exactly what is need or ...

Chemistry
Thank you very much!

Chemistry
Can someone please check this for me? C4H8+5O2-->3CO2+4H2O+C Butane is a gas and .01 g of it is burned. Is .00218 g of carbon the result? Thanks

heath care
If you search the reading material for the patients name you will find the information needed to answer the first scenario. Just type "Myelin" into the adobe reader search bar.

college chemistry-thermochemistry
thanx so much!

college chemistry-thermochemistry
i have one more question: I know this one has to do with hess's law but i'm not sure of how to get the enthalpy of vaporization from this? Clculate the enthalpy of vaporization of solid potassium bromide to a gas of ions, the process KBr--->K{+1}(g)+Br{-1}(g), from ...

college chemistry-thermochemistry
ya you're right i accidently put the wrong value in!

college chemistry-thermochemistry
i have one more question: I know this one has to do with hess's law but i'm not sure of how to get the enthalpy of vaporization? Clculate the enthalpy of vaporization of solid potassium bromide to a gas of ions, the process KBr--->K{+1}(g)+Br{-1}(g), from the follow...

college chemistry-thermochemistry
I got: delta H= 482.79J 482.79/150gNH4NO3 x 80gNH4NO3/mol NH4NO3 =2574.88J/mol =2.575 kJ/mol Is this right?

college chemistry-thermochemistry
A 1.50g sample of NH4NO3(s) is added to 35.0g of water in a foam cup and stirred intil it dissolves. The temperature of the solution drops from 22.7 to 19.4 degrees celcius. What is the heat of dissolution of NH4NO3, expressed in kJ/mol NH4NO3?

History
Do you agree with Darwin's idea of natural selection. Why or why not. Give minimum of 3 examples. thanx

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