# Posts by noel

Total # Posts: 84

Math
Tanø(secø+2)

Math
Each homeroom of a middle school receives 1/12- acre plot of 5/6 acre of land. How many classrooms receive a plot of land. 5/6 divided by 4840 is this correct

Math
On a map with a scale of 1:100m, what is the actual area of a land in hectares if it is 180 sq.m on the map?

Math/Algebra
In the school election, votes were cast for Sam, Mary, and Bill in the ratio of 4:3:2. If a total of 2,178 votes were cast, how many votes did Mary receive?

Statistics
A distribution of test scores of 600 examinees follows a normal distriburion with an everage of 80 having a standard deviation 12, how many examinees would you expect to find above a score of 100?

physics
If 0.055 kg of ice at 0 ∘C is added to 0.330 kg of water at 32 ∘C in a 0.100-kg aluminum calorimeter cup, what is the final temperature of the water?

Physics
A car of mass 1390 kg rests on a hydraulic lift with a piston of radius 0.26 m that is connected to a second piston of radius 0.033 m. If the car is just barely lifted off the ground, what is the force at the second piston? I Tried F1/F2 = r1^2 / r2^2 ==> 1390x10 / F2 = 0....

Physics
A tennis ball is dropped from 1.54 m above the ground. It rebounds to a height of 0.845 m. With what velocity does it hit the ground? The acceleration of gravity is 9.8 m/s^2 . (Let down be negative.) Answer in units of m/s.

Physics
A crate of mass 40 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 14 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between the crate and the ramp...

Science 1 question
A researcher, studying dolphins in the wild, made the following sketch. Each dot on the map represents one dolphin. The area surveyed by the scientist was 1 km ^2. Based on the researcher's data, how many dolphins would you estimate to be in a 3 km ^2 area? 3 7 14 21 SORRY...

Okay... I think I get it now. Thank you SO much! :)

I'm still really confused.

Also, on this one I am stumped: Select two groups of Native American people from two different areas within the United States. The areas you can select from include the North, West, Southwest, Plains, and East/Southeast. Explain how environmental factors influenced their homes...

What different reasons did the European nations have for exploration? Provide at least one example specific to Spain, France, and Britain. Where did Spain, France, and Britain choose to settle while exploring? Why did they settle these particular areas? MY ANSWER: What ...

math
If the sum of first n term is 1600,and the common different is 2 while the 1st term is 1.find n?

chemistry
A buffer with a pH of 4.30 contains 0.25 M of sodium benzoate and 0.20 M of benzoic acid. What is the concentration of [H ] in the solution after the addition of 0.052 mol of HCl to a final volume of 1.5 L? I know that Ka = 6.3x10-5 do I need to use an ice table or is the pH=...

Okay, 2 more questions sorry The state in which a person's ability to function mentally or physically is impaired is called a. a hangover b. a blackout c. intoxication d. a coma Another term for alcohol poisoning is a. hangover b. blackout c. intoxication d. overdose

For drivers over 21 years of age DWI or DUI is defined as a. A BAC of 0.08 or higher b. A BAC of 0.10 or higher c. A BAC of 0.20 or higher d. any amount of alcohol in the blood Thanks!

Hi Reed, What are the answers to 1 and 2 then?

HELP: PART 2 1. One way that European settlement changed the lives of the native peoples in the Plains region was by A. Exposing them to new diseases* B. Building schools for their children C. Giving them free land D. Teaching them how to farm their land 2. How has the ...

HELP: PART 1 1. What was the result of the 1995 referendum held in Quebec? A. Quebec separated from Canada* B. French became the official language of Canada C. Quebec's people voted to remain part of Canada D. Quebec became part of France 2. Early Spanish, British, and ...

math
a tray with a square base is to be made from a square piece of cardboard by cutting 5 inch squares from each corner and folding up the sides. If the box is to hold a volume 520 cubic inches, find the length of the piece of cardboard that is needed.

gen chem
use the rydberg equation to calculate the wavelength in A of the photon absorbed when a hydrogen atom undergoes a transition from n=7 to n=9

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 ??

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?

history
middle east, late 1300's-1700's

history
ways non-Muslims were treated in the Islamic world?

math
Find opxthe volume of a rectangular box 9 feet by 7.1 feet by 7 feet.

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

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

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

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

feta = β

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 ...

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

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^-...

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

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

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

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...

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.

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.

calculus(integral)
intergral 2x^2/(x^2+4x+8)

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

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?

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?

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

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?

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

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

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

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

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?

statistics
what is the 4σ rule of thumb in statistics

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

chemistry
But the problem didn't give temperature that is qhat confused me

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

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

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.

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

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.

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?

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 ...

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

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

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 ...

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

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

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...

Maths
How do I work out square roots without a calculator?

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

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

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

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)

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

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

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 ...

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

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, ...

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. ++++ ...

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?

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 ...

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