Wednesday
November 26, 2014

Posts by noel


Total # Posts: 60

MATHS
please help me ...Experiments show that radium at rate proportional to the amount of radium present at the moment . if half life is 1590 years what percentage will disappear in one year ??
September 26, 2014

MATHS
experiments show that radium disintegrates at a rate proportional to the amount of radium present at the moment . if half life is 1590 years what percentage will disappear in one year?
September 26, 2014

history
middle east, late 1300's-1700's
July 13, 2014

history
ways non-Muslims were treated in the Islamic world?
July 13, 2014

math
Find opxthe volume of a rectangular box 9 feet by 7.1 feet by 7 feet.
September 1, 2013

TRIGONOMETRY
Suppose tan theta=15pi/18 is less than theta 3pi/2 , what are the other trigonometric functions?
July 9, 2013

Chemistry
Given the balanced equation: a. Fe2O3+3C=2Fe+3CO: b. How many moles of Fe are produced when 1.36 moles of carbon monoxide are produced? c. How many grams of Fe is part b equal to? d. how many molecules of Fe are in part B
October 8, 2012

trig
Determine the period, amplitude and phase shift for each given function: A)y = -4 cos 3x + 5 B)y = 2/3 sin (30x-90degrees)-10 c)y = -0.38 tan (x/3+pi/3) d)y = pi cos(2x)+ pi
August 12, 2012

trigonometric identities
Prove the following trigonometric identities 1. tanx = sinx + sin^2x/cosx(1+sinx) 2. cos^3+(cosx)(sin^2x) = 1/secx
June 22, 2012

Math (please help!)
feta = β
June 11, 2012

Math (please help!)
1. θ is a first quadrant angle in standard position and cos 1/(sqrt10)= . Find the exact value of sin . 2. feta is a second quadrant angle in standard position and tan(feta) -((sqrt5)/2) = . Find the exact value of cos(feta) . 3. θ is an angle in standard position ...
June 11, 2012

math
Simplify each of the following: 1. 16*(2^x)+2 2. 3[sqrt(x^1/4)*sqrt(x)/5*sqrt(x^2)] 3. ab^(2x+y)/a^x b^x
May 28, 2012

math (please double check my answers)
Simplify the following using the laws of exponents: Need help with these: a) (9)^1/2 x 4^2/24 b) 16 x 2^x+2 Simplify each of the following: b) b) 3 sqrt x^1/4 sqrt x/ 5 sqrt x^2 c) (ab)^2x+y /a^x b^y Need these answers double checked: c) 3^-8/3^-6 x 3^-5 3^-8/3^-6+-5 3-8^ 3^-...
May 27, 2012

math
It's f(x) = .25(4^x) - 2 Thank you!
May 27, 2012

math
5. Find the slope of the secant to the curve f(x) = 0.25(4)^x - 2 between: i) x = 0 and x = 1 ii) x = 0 and x = 0.5 iii) x = 0 and x = 0.1 iv) x = 0 and x = 0.01
May 27, 2012

math
7. Determine the inverse of each relation given. a. f(x) = 1/x-2 + 3 b. f(x) = 2(x – 4)^2 + 5
May 24, 2012

Math (need formula)
I would be very appreciative if someone could provide me with the formula I would use to plug these figures into a graph. 3. A 2m length of board rests with one end on the floor and the other end on a small stack of bricks. A baseball is rolled up the board and back down again...
May 16, 2012

Physics
When a 0.50 kg-object is attached to a vertically supported spring, it stretches 0.10 m from the equilibrium position. Find k for the spring.
February 22, 2012

physics
Given x(t) = xm cos 2ðt/T for a spring with constant k and attached mass m sketch as a function of t, (a) the displacement x, (b) the velocity v, (c) the acceleration.
February 22, 2012

calculus(integral)
intergral 2x^2/(x^2+4x+8)
February 11, 2012

dependance of a man on the enviroment
How do deforestation and urban sprawl affect the greater food web?
January 28, 2012

mind and machine
What figure from the history of philosophy section do you think might have some views that are similar, or at least relevant, to your own?
August 24, 2011

physical chemistry
find the ph of the solution that results from the addition of 25ml of 0.1mol/l NaOH solution to 50ml of 0.1mol/l HCL solution?
April 26, 2011

Chemistry
A flask partially full of liquid water is heated to boiling and capped cold water is poured over the flask. The water boils even more vigorously explain
April 11, 2011

physics
Quartz has a refractive index of 1.54. If light from a HeNe laser impinges on an air/quartz interface at an angle of 22.5 degrees, what is the angle of refraction?
April 6, 2011

physics
Calculate the frequency in hertz, wavelength in nm, and the velocity in m/s of light inside a material with a refractive index of 1.39. In vacuum, the light has a wavelength of 514.5nm
April 5, 2011

chemistry
the work done by the system during a certain adiabatic process is 200J. What is the change in U of the system
February 6, 2011

chemistry
if PV=RT + ἁP where ἁ is a constant Calculate the work if the gas is heated at constant pressure from T1 to T2 Calculate the work if the gas is expanded isothermally and reversibly
February 2, 2011

Chemistry
what would be the effect on a chromatographic peak of introducing the sample at too slow a rate
January 31, 2011

chemistry
how would the graph of Pressure vs Volume look for a sample of an ideal gas that has a volume of 1 L at 0 degrees Celsius and 1 bar. How would the graph of Pressure versus volume look for sample of gas at the same conditions but at 100 degrees Celsius?
January 25, 2011

statistics
what is the 4σ rule of thumb in statistics
January 25, 2011

chemistry
calculate the rms speeds of He at 10, 100, and 1000 K in meters per second and in miles per hour. What values would be otained if the pressure was 10^-10 bar
January 23, 2011

chemistry
But the problem didnt give temperature that is qhat confused me
January 22, 2011

chemistry
calculate the pressure (in Pascals and bar) of 10^23 gas particles each with a mass of 10^-25 kg, in a 1 L container if the rms speed is 100m/s? What is the total kinetic energy of these particles? What is the temperature inside the container
January 22, 2011

chemistry
calculate the pressure in Pa and bar of 10^23 gas particles each with a mass of 10^-25 kg, in a 1 liter container if the rms speed is 100m/s
January 22, 2011

Chemistry
0.10 M potassium chromate is slowly added to a solution containing 0.50 M AgNO3 and 0.50 M Ba(NO3)2. What is the Ag+ concentration when BaCrO4 just starts to precipitate? The Ksp for Ag2CrO4 and BaCrO4 are 1.1 x 10-12 and respectively.
January 16, 2011

chemistry
Calculate the pH of a 0.800 M NaCH3CO2 solution. Ka for acetic acid, CH3CO2H, is
January 16, 2011

chemistry
If 0.10 M potassium chromate is slowly added to a solution containing 0.50 M AgNO3 and 0.50 M Ba(NO3)2. What is the Ag+ concentration when BaCrO4 just starts to precipitate? The Ksp for Ag2CrO4 and BaCrO4 are 1.1 x 10-12 and respectively.
January 16, 2011

science
Ammonia gas can be prepared by the reaction of a metal oxide such as calcium oxide with ammonium chloride. CaO(s) + 2 NH4Cl(s) 2 NH3(g) + H2O(g) + CaCl2(s) If 199 g of CaO and 300. g of NH4Cl are mixed, what mass of NH3can be produced?
September 16, 2010

chemistry
A piece of metal weighing 26g is immersed in a quantity of water in a graduated cylinder. The initial volume of the water was 16.0 ml and volume of water plus metal is 22.0 ml. The density of metal in g/ml is? If you get this right i will hand you over my beach front property ...
July 21, 2010

chemistry
What is the oxidation number of PO4 in the compound Ca3(PO4)2? how do you get it?
July 21, 2010

math
to answer this question you need to know the formula for the circumference of a circle is: circumference = pi * 2r and a circle is 360 degrees. so the length of the arc is what fraction of the whole circle? and that fraction times the above circumference formula is your answer
March 30, 2010

math
base figures you need to know 5280 feet in a mile 12 inches in a foot 60 minutes in an hour The circumference of a circle formula is circumference = pi * radius * 2 the trick of this problem is you have feet in the mile but inches in the tire & hours in the speed but minutes ...
March 30, 2010

math
g) 30 = 30 * .25 + (30+10) * .10 30 * .25 + 40 * .10 7.50 + 4.10 11.50
February 25, 2010

history
hey coould anyone tell me is the title lord in the 1700's england was compatible with involvement in the royal navy?
September 17, 2009

religion
he wasn't fully human- he was human and fully God. he came as a human to absorb the wrath God had to use to punish sin. Jesus did that for all who trust in him and his grace. otherwise...
August 31, 2009

Maths
How do I work out square roots without a calculator?
August 28, 2009

If...=, find...
If h(x)=3/(2x+1), find h^-1(x)
July 27, 2009

religion
his death itself wasn't the point. It was his ressurection. God poured the wrath meant for sinners on the only substitute possible, his son. he died, and payed the price on the cross as he died. but he was ressurectred after 3 days, so anyone who trusts in him will be saved
June 11, 2009

pre-algebra
how do i identify the slope snd y-intercept of the graph of each equation. Then graph the equation? plz help asap!
February 26, 2009

Chemistry
Classify each of the following actions by whether it causes a leftward shift, a rightward shift, or no shift in the direction of the net reaction. N2(g)+ O2(g)=2NO(g)
February 5, 2009

Computers
How would you test an object-oriented design’s sequence diagrams? Be specific.
October 22, 2008

math riddle ALGEBRA WITH PIZZAZZ
O'lay ,like that company that does hair shampoos or O'lay at a bull fight :) Si' hablo españole'
September 14, 2008

geometry
ok, so i don't understand this question. : which postulate justifies the following statement? "exactly one plane contains <(angle)ABC"??? i don't get what i'm supposed to answer and i don't even understand what it's trying to say. and i've ...
October 21, 2007

History
What's the difference between COMECON and COMINIFORM? Thanks in advance! http://en.wikipedia.org/wiki/Comecon http://en.wikipedia.org/wiki/Cominform
April 24, 2007

1st grade math please help!!!
8...
April 24, 2007

HISTORY...
What is the EU (European Union)? Was is successful? Why or why not? The EU now consists of most countries of Europe. It started out as the "Common Market" following World War II and kept growing. It is very successful. More countries are eager to join. The Euro is, ...
April 24, 2007

HISTORY
Does this sentence make any sense and is it accurate? The Soviet Union, however, rejected the Marshall Plan due to the belief that they could not keep a close eye on the satellite states in the Eastern bloc and that the West was trying to enforce their democratic ideas. ++++ ...
April 24, 2007

Biometrics II
If these samples were drawn from a population with mean male weight of 180 and mean female weight of 165, what is the probability that the difference between the mean male and female weights would lie between 4.5 and 27.8?
February 25, 2007

Biometrics
If these samples were drawn from a population with mean male weight of 180 and mean female weight of 165, what is the probability that the difference between the mean male and female weights would be greater than the observed sample? (The sample means are female 167.2 with a ...
February 25, 2007

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