Wednesday
August 5, 2015

Posts by anonymous


Total # Posts: 83,138

Math
Determine whether, for any set A, it is true that P(A) = P(U) − P(A). If it is true prove it, if it is not, give a counterexample.
April 22, 2015

Social Studies
Please help Ms. Sue!!! The following, "People want to ensure that Puerto Ricans always identify with the spanish language and culture." Provides support for which of the following statuses for the country of Puerto Rico? a. Separate Nation b. U.S. Commonwealth** c. U...
April 22, 2015

check 1 easy question
My answer is D
April 22, 2015

check 1 easy question
Which word is most similar to the word intuition? refinement principles reasoning insight <----
April 22, 2015

Calculus
F(x)=Integral of (-12sinx/cos^2x) dx+c F(0)=4. Find C
April 22, 2015

math
i have no idea. i just need the answer
April 22, 2015

Statistics
The daily sales of a retail store are normally distributed with a standard deviation of $500. If the probability that sales will be less than $10,000 in any one day is 40%, what are the mean daily sales?
April 22, 2015

Statistics
What is the lowest z-value for the highest 2% of observations on the standard normal distribution?
April 22, 2015

math
a road crew must clear a hill that is 110.0 feet tall so that a new road can be built, they are to clear 11 1/2 feet of the hill each day, find the equation in slope intercept on the line that represent to height
April 22, 2015

Algebra IMPORTANT
2k+ 5k+1 + 10k+2 are three successive terms of a geometric sequence find the value(s) of k
April 21, 2015

Math
Use mean median or mode to predict how many strokes need to complete a golf ball
April 21, 2015

chemistry
pH=6.5
April 21, 2015

chemistry
One way to raise the pH of an acidic lake (and restore aquatic life) is to add limestone (CaCO3). How many grams of CaCO3 are needed to neutralize 1.2kL of the acidic water from the lake if the acid is sulfuric acid? H2SO4(aq)+CaCO3(s)→CO2(g)+H2O(l)+CaSO4(aq)
April 21, 2015

Bio
If a person’s liver makes 1000 mg/hour of urea during an average day, what would the concentration of urea be, in mg/mL, for a person making 1.0 L of urine during a particular day? What would it be for a person making 1.5 L of urine during a particular day?
April 21, 2015

Math
A car measures 20 feet. What is the length of a model car if the scale factor is 1:64 inches? I can't show my work because i don't even understand any of it!
April 21, 2015

Chemistry
What is the volume of 2.0 moles of an ideal gas at 290 K and 2.8 atm?
April 21, 2015

Social Studies
Then i think its D
April 21, 2015

business
8. Student Betty says that physical distribution includes both transportation and storage. Student Bob says that exchange includes both buying and selling. Which student is correct? A. Bob only B. Neither C. Both D. Betty only
April 21, 2015

business
21. _______ ratios measure the degree to which a firm relies on borrowed funds in its operations. A. Retail earning B. Wholesale earning C. Earnings per share D. Leverage (debt)
April 21, 2015

business
28. The North American Free Trade Agreement (NAFTA) can be expected to A. increase trade restrictions among the member nations. B. result in political unification of the member countries. C. increase the number of low-wage jobs in the U.S. D. vastly increase trade among the ...
April 21, 2015

intoduction to business
35. Union workers at an auto parts plant go out on strike. In response, management closes the plant. This tactic is a A. cooling-off period. B. secondary boycott. C. lockout. D. strikebreaker.
April 21, 2015

calc
the i and 3 are separate as well
April 21, 2015

calc
yes. so i 3 (1+i) (-i)
April 21, 2015

calc
Find the inverse of each of the following matrices, if possible [i 3 1+i -i]
April 21, 2015

Religon
This year academically for me has been tough. But, I know that by myself I can do nothing, but with God I can accomplish everything. I'm happy to say the semester is almost over and through God's strength alone I have been able to get through my classes :) I know that ...
April 21, 2015

Life orientation
Describe the human right violation(Xenophobia) that is taking place in your community
April 21, 2015

math
Factorise the following 1) a^3 - b^3 - a - b 2) a^2 - b^2 + 10a - 2b + 24
April 21, 2015

math
xiao
April 21, 2015

Chemistry
a student carefully measures the melting point of a solid material. she measures the range to be 81.2 - 83.7 degree. assuming she has done the measurement correctly. what can she conclude about the sample, and why
April 21, 2015

Chemistry
You are given potassium carbonate solid and potassium sulfate. Both are white solids. How would you separate potassium carbonate and potassium sulfate?
April 20, 2015

Science
In what ways are electric generators and motors similar? In what ways are they different?
April 20, 2015

Chemistry
I sincerely apologize. Here's the reaction: 2C(s) + O2(g)→2CO(g)
April 20, 2015

Chemistry
Can someone answer this question? The enthalpy of combustion of solid carbon to form carbon dioxide is -393.7 kJ/mol carbon, and the enthalpy of combustion of carbon monoxide to form carbon dioxide is -283.3 kj/mol CO. Use these data to calculate ∆H for the reaction. ...
April 20, 2015

4th Math
sam cut a pie into equal slices. there are only 3 slices left. the angle measure for the 3 slices is 72 degrees. How many slices did sam cut the pie into? 360
April 20, 2015

Calculus
A fence 4 feet tall runs parallel to a tall building at a distance of 2 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?
April 20, 2015

HELP
a car wheel turning at 0.5 is brought to rest by the brakes in exactly two revolutions. what is the angular acceleration of the wheel?
April 20, 2015

san jac
a sample of nitrogen gas contain 5.0mol in a volume of 3.5L calculate the new volume of the container if the pressure and temperature are kept constant but the number of moles of nitrogen is change to 2.5 mol
April 20, 2015

HELP please
a car wheel turning at 0.5 is brought to rest by the brakes in exactly two revolutions. what is the angular acceleration of the wheel?
April 20, 2015

math
Determine the number of divisors of the integer 4312440.
April 20, 2015

PHYSICS
a 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s^2 over a 3.54-s interval
April 20, 2015

Science
@Mrs.Sue
April 20, 2015

Science
The diagram below shows a process in Earth's crust. Which of the following statements best describes the process in the diagram. A Converging plates from Mountains B Converging plates from Volcanoes C Diverging plates form Mountains D Diverging plates form a rift valley I ...
April 20, 2015

Biology
what is an adaptive radiation
April 20, 2015

science 8th (::
So what one is it
April 20, 2015

business calculations
0.2
April 20, 2015

business calculations
albino rats used to study the hormonal regulation of a metabolic pathway are injected with a drug that inhibits body synthesis of protein. usually, 4 out of 20 rats die from the drug before the experiment is over. this time round, 10 animals are treated with the drug. what is...
April 20, 2015

Calculus check and help
Let f and g be the functions given by f(x)=1+sin(2x) and g(x)=e^(x/2). Let R be the shaded region in the first quadrant enclosed by the graphs of f and g. A. Find the the area of R. B. Find the value of z so that x=z cuts the solid R into two parts with equal area. C. Find the...
April 19, 2015

Calculus
Let f and g be the functions given by f(x)=1+sin(2x) and g(x)=e^(x/2). Let R be the shaded region in the first quadrant enclosed by the graphs of f and g. A. The region R is the base of a solid. For this solid, the cross sections, perpendicular to the spx-axis, are rectangles ...
April 19, 2015

Physics
(Image included with problem) 9.186E-1 moles of an ideal diatomic gas undergoes a transition from a to c along the diagonal path in the figure. The temperature of the gas at point a is 1310 K. During the transition, what is the change in internal energy of the gas? How much ...
April 19, 2015

Physics
A heat engine carries 2.60 mol of an ideal monatomic gas around the cycle shown in the figure. Process 1-2 takes place at constant volume and takes the gas from 300 K to 600 K, process 2-3 is adiabatic and takes the gas from 600 K to 455 K, and process 3-1 takes place at a ...
April 19, 2015

Chemistry
Copper has a specific heat of 0.387 J/g·°C. How much energy is required to raise the temperature of 215 g of copper from 47.0°C to 164.0°C?
April 19, 2015

Calculus
Sorry. I'm really confused though.
April 19, 2015

Calculus
Let f and g be the functions given by f(x)=1+sin(2x) and g(x)=e^(x/2). Let R be the shaded region in the first quadrant enclosed by the graphs of f and g. A. Find the volume of the solid generated when R is revolved around the line y=pi. B. Fine the volume of the solid ...
April 19, 2015

Pre-Calculus
I get ã145 but the answer according to the answer key is 9ã2
April 19, 2015

chem
The solubility of air in water is approximately 2.1x10^-3 M at 20 C and 1 atm. What is the constant for air.?
April 19, 2015

Calculus
For C i for 1.348 u^3. Is that right?
April 19, 2015

Calculus
Let f and g be the functions given by f(x)=1+sin(2x) and g(x)=e^(x/2). Let R be the shaded region in the first quadrant enclosed by the graphs of f and g. A. Find the the area of R. B. Find the value of z so that x=z cuts the solid R into two parts with equal area. C. Find the...
April 19, 2015

sam
integral from 1 to x of (5/(t^3 +3))dt
April 19, 2015

algebra
Suppose a car that sells for $40,000 depreciates 10% per year. How many years would it take for the car to have a value less than $25,000
April 19, 2015

MAth
How many inches are in 75% of 20 yards?
April 19, 2015

calculate the area of plane figures
y=x^2 y=8-x^2 NEED HELP
April 19, 2015

math
ibrahim has a bag containing five red balls,six yellow balls and four white balls , the ball is pick at random from the bag.find the probability that: (a))red or white ball ? (b) yellow or red ball ? (c) not red
April 19, 2015

Error Analysis
What can you do to reduce global warming in Thailand? Global warming is major problem affecting the world. Now, the world needs help from every human being. As a people, we can reduce global warming by following ideas. First, we can reduce global warming in Thailand by reduce ...
April 19, 2015

algebra
Describe how you know if an inequality is an “and” or an “or” problem. (use -3 < x+5 < 8). Also, how do you know if an absolute value question is an “and” or an “or” problem?
April 18, 2015

Physics
At what time after being ejected in the boulder moving at 20m/s upward if a large boulder is ejected from volcano with initial
April 18, 2015

Architect
What kind of training do you need to become a landscape architect?
April 18, 2015

physics
An aluminum calorimeter of mass 400g contains 200g of water at a temperature of 18celcius.When a block of nickel at a temperature of 80celcius is dropped into the water£¬the final temperature of the mixture becomes 28celcius. Find the mass of the nickel.
April 18, 2015

Science
53.9 mL of 0.991 M nitric acid is added to 45.3 mL of sodium hydroxide, and the resulting solution is found to be acidic. 20.5 mL of 1.51 M potassium hydroxide is required to reach neutrality. What is the molarity of the original sodium hydroxide solution?
April 18, 2015

physics
A cook placed five eggs£¬each having a heat capacity of 114J/celcius£¬in a 250g aluminum pot containing 0.5L of water at a temperature of 20celcius. If the heating element is raised at 750W£¬and one fifth of the heat escapes to the surroundings&...
April 18, 2015

physics
Before leaving for a vacation£¬the owners of a home 8.0m *21m*5.0m turn the thermostat down to 14celcius. On their return£¬how much heat is needed to raise the temperature of the air inside the home to 21celcius£¿Ignore the heat needed to warm ...
April 18, 2015

physics
A technician makes a 5.0 kg metal object containing two parts£¬one of iron and the other of aluminum.If it takes 504kj to change the objects temperature from 25 celcius to 165celcius£¬what is the mass of each part£¿
April 18, 2015

physics
Tony£¬a 110kg football player£¬has a fever of 39celcius. What mass of water must evaporate from his body to cool him to 37celcius£¿
April 18, 2015

Physics
A stone is dropped from the peak of a hill. It covers a distance of 45 meters in ther last two seconds of its motion. Find the height of the peak?
April 18, 2015

ENGLISH
Why we have to slaughter
April 18, 2015

chemistry
25 ml of 3M hno3 are mixed with 75ml of 4.0M HNO3 if volumes are additive then find molarity
April 18, 2015

s.s
Thank you!
April 18, 2015

s.s
My friends asking. who was JFK killed by and was Lincoln a republican or democratic
April 18, 2015

troduction to computer
you call the help desk to report a problem you are having on your computer. The technician asks you what operating system you are running . you know it is windows 7 but you forget which version. how can you find out
April 17, 2015

math
Kerry states laps around the playground. The playground is 150 meters and 50 meters wide. How many laps will it take Kerry to state 1 km?
April 17, 2015

math
Kerry states laps around the playground. The playground is 150 m long and 50 m wide. How many laps will it take Kerry to skate 1 km?
April 17, 2015

law
do you think traffic stops based solely on racial profiling are constitutionally valid?
April 17, 2015

Math
If a = b + 2*
April 17, 2015

Math
If a = b + 2l then (b - a)^4 = ? F. -16 G. -8 H. 1 J. 8 K. 16
April 17, 2015

chemistry
If 0.605 g of magnesium hydroxide reacts with 0.900g of sulfuric acid, what is the mass of magnesium sulfate produced? Mg(OH)2(s)+H2SO4(l)→MgSO4(s)+H2O(l)
April 17, 2015

Math 222
How do I write the answer in fraction form.
April 17, 2015

calc
Suppose that an accelerating car goes from 0 mph to 58.6 mph in five seconds. Its velocity is given in the following table, converted from miles per hour to feet per second, so that all time measurements are in seconds. (Note: 1 mph is 22/15 feet per sec = 12/15 ft/s.) Find ...
April 17, 2015

Social studies
I just read it and I think it's b
April 17, 2015

Social studies
how was south carolina constitution of 1868 different from earlier versions? A. Representation was based on wealth and population B. Property owners alone could vote C. All men were given the right to vote D. Women were given the right to vote Is it A:)
April 17, 2015

Physics
Proove a*sin(x)+b*sin(x+phi)=((a+b)^2*cos(phi)^1/2*sin(x+phi/2)
April 17, 2015

mathematics
Given triangle DEF with vertices D(-3;6) ,E(-2;-3) and F(x;1) with DE=DF, determine the value of x
April 17, 2015

science
A rectangular barge floats in freshwater. When a 400 kg block is loaded on the 5 m long by 2 m wide barge, the barge sinks a few centimeters deeper. How much deeper does the barge lower?
April 16, 2015

physics class
Suppose that you balance a 5 kg ball on the tip of your finger that has an area of 1 cm2. What is the pressure on your finger?
April 16, 2015

Calculus check and help
Let R be the region bounded by the curves y=lnx^2 and y=x^2-4 to the right of the y-axis. A. Find the area of R. B. Find the folume geneated when R is rotated about the line y=-4. C. Write, but do not evaluate the integral expression that gives the volume of the solid ...
April 16, 2015

Calculus check
The functions f and g are given by f(x)=sqrt(x^3) and g(x)=16-2x. Let R be the region bounded by the x-axis and the graphs of f and g. A. Find the area of R. B. The region R from x=0 to x=4 is rotated about the line x=4. Write, but do not evaluate, an integral expression the ...
April 16, 2015

math
The surface area of a rectangular prism is 729 square meters. What is the surface area of a similar prism that has edge lengths that are larger by a scale factor of 3
April 16, 2015

Interaction of Forces
The ball in the image below is rolling toward the block. The ball will create a disturbance in the stability of the block by knocking it over. Which of the following correctly predicts what will happen to the block? [image of ball rolling toward tall, skinny block] - Unstable ...
April 16, 2015

exponential equations
Jen made an initial investment of $1000 into a T-Bill account. After 2 years, her investment totaled $1 175. Calculate the rate of appreciation, r, of the investment. Give answer to 2 decimal places. 1.175 ------ = 1 1000 - -1 2
April 16, 2015

Social studies
9 is a
April 16, 2015

Social studies
9 is a
April 16, 2015

chemistry
When 2.85 g of HC7H5O2 (molar mass = 122.12 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter changed from 24.05 ºC to 29.19 ºC. What is the heat capacity of the calorimeter in units of kJ/ºC?
April 16, 2015

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