Saturday

April 25, 2015

April 25, 2015

Total # Posts: 80,560

**math**

1. 5*3^n A.5,15,45,135 B.15,30,45,60 C.15,45,135,405<----- D.0,15,45,135
*April 22, 2015*

**Geometry**

The measure of the consecutive sides of an isosceles trapezoid are in the ratio 8:5:2:5 the perimeter of the trapezoid is 140 inches if it's height is 20 inches find the area of the trapezoid
*April 22, 2015*

**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*

**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 9ã2
*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*

**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*

**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*

**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*

**math**

hamid has 2 qt container of grape juice tell two ways that hamid can divide the grape juice into 5 containers
*April 16, 2015*

**calculus word prob**

Two buildings at opposite corners of a parking lot need to be connected by cable that will be buried under ground. It costs $11/ft to lay accross parking lot and $8/ft to lay along the sides. The lot is 300ft by 360 ft rect from pt A to the opposite corner with indents of 60ft...
*April 16, 2015*

**math word problems**

Q. Marissa had a doctors appointment last Friday. the bill for her visit came to $345. Her family's health insurance will pay 80% of the bill. What is the dollar figure that Marissa's family will have to pay?? - A. Do I divide...?
*April 16, 2015*